Podcasts about Ruthenium

Don Weatherbee, CEO of REGENX is committed to promoting environmentally responsible practices for recovering and regenerating platinum group metals back into raw materials from end-of-life catalytic converters. What is this process? (PGMs are-Platinum, Rhodium, Palladium, Osmium, Iridium, Ruthenium)

On this episode of the Crazy Wisdom Podcast, host Stewart Alsop chats with Matthew Gialich, co-founder and CEO of AstroForge, about the fascinating world of asteroid mining. They explore how advances in technology and reduced launch costs are enabling humanity to tap into the untapped resources of metallic asteroids, the challenges of deep space operations, and the long-term vision for making asteroid mining economically viable. Listeners can follow AstroForge for updates on LinkedIn and Twitter, and connect with Matthew directly for inquiries on his LinkedIn or at matt@astroforge.io.Check out this GPT we trained on the conversation!Timestamps00:00 Introduction to the Crazy Wisdom Podcast00:17 Asteroid Mining: Current Knowledge and Discoveries01:58 Near-Earth Asteroids and Their Potential04:08 The Value of Platinum Group Metals06:21 Spacecraft Operations and Human Involvement11:06 Asteroid Missions and Scientific Discoveries21:38 Economic and Environmental Implications of Space Mining27:04 Collaborating with SpaceX for Asteroid Missions27:42 Challenges and Opportunities in Moon Mining29:20 Navigating Gravity in Space Missions30:09 The Origin Story of Astroforge33:32 Asteroid Mining: Past and Present34:29 The Future of Space Industry and Business38:05 Radiation Challenges in Deep Space40:44 Thermal Management in Spacecraft42:43 Innovations in Robotics and Manufacturing45:37 The Role of Software in Space Startups50:10 Recruiting Top Talent for Astroforge51:37 Knowledge Management and Team Structure52:40 Staying Connected with AstroforgeKey InsightsAsteroid Mining is Becoming Feasible: Advancements in telescope technology and reduced launch costs are paving the way for asteroid mining to transition from science fiction to reality. AstroForge is focused on mining metallic asteroids rich in platinum group metals, which are critical for various industrial applications.Near-Earth Asteroids Offer Better Opportunities: Contrary to Hollywood depictions of mining in the asteroid belt, near-Earth asteroids are more accessible and practical targets for mining. These asteroids are closer to Earth and contain valuable materials, making them ideal for the initial stages of space resource exploitation.The Importance of Platinum Group Metals: Platinum, rhodium, palladium, and other platinum group metals are integral to modern technology, found in everything from electronics to industrial equipment. Mining these materials in space could revolutionize supply chains and reduce the environmental impact of terrestrial mining.The Role of Technology in Exploration: AstroForge uses cutting-edge sensors, spectrometry, and imaging systems to study and identify the best asteroids for mining. These technologies allow for remote analysis of asteroid composition, paving the way for efficient resource extraction missions.Spacecraft Design for Deep Space: AstroForge is designing spacecraft optimized for deep space exploration, which operate in the harsh conditions beyond Earth's gravity well. Challenges like radiation, thermal management, and propulsion systems are central to the company's engineering efforts.Economic and Environmental Impacts of Space Mining: Space mining has the potential to make terrestrial mining for certain materials economically obsolete, reducing environmental damage and the hazardous conditions associated with deep-earth mining operations. The company's vision includes making Earth a better place by shifting resource extraction to space.The Evolution of the Space Industry: The space sector is evolving rapidly, with private companies leading the charge in areas traditionally dominated by government agencies. AstroForge's mission is a testament to this shift, focusing on commercializing deep space exploration and mining with innovative strategies and cost-efficient technologies.

Most of us don't grow up across the street from a chemistry building or know from an early age that we want to be a scientist, but Alan Dyke, VP of Business Development for ProChem, Inc. (CTO of Boulder Scientific Company at the time of the interview) did and became a chemist. Dr. Alan Dyke, former colleague, and friend of Paolo's, shares his career path and discusses the history and current state of the field of catalysis. With a father that taught university-level chemistry, and a brother in the field, it may not be surprising that Alan Dyke became a chemist, but it is surprising is that he's considered to be the outcast of the family for choosing a commercial career instead of taking an academic route. But, as he'll passionately reveal, there are upsides to choosing a non-academic career. Join us for a wonderful conversation where Paolo and Alan recount their shared history and the evolution of the catalysis field over recent decades. They discuss the evolution of homogeneous cross-coupling, biocatalysis, metathesis, and metallocene chemistry. Application of catalysis to fields as varied as pharmaceuticals and polymers is discussed, along with sustainability and other trends and dynamics in the field. Overcome your activation energy and join us!Related episodes: Season 1, Ep.2: Reinventing plastics, one reaction at a time Season 2, Ep.1: Chemistry: a modern American dreamSeason 2, Ep.6: The charm of the forgotten elements Bonus content!Access bonus content curated by this episode's guest by visiting www.thermofisher.com/chemistry-podcast for links to recent publications, podcasts, books, videos and more.View the video of this episode on www.thermofisher.com/chemistry-podcast. A free thank you gift for our listeners! Visit the episode website and request your free Bringing Chemistry to Life t-shirt.Use Podcast Code:  laBcheM in March or sc13nc3 in April We read every email so please share your questions and feedback with us! Email helloBCTL@thermofisher.com About Your HostPaolo Braiuca grew up in the North-East of Italy and holds a PhD in Pharmaceutical Sciences from nearby esteemed University of Trieste, Italy. He developed expertise in biocatalysis during his years of post-doctoral research in Italy and the UK, where he co-founded a startup company. With this new venture, Paolo's career shifted from R&D to business development, taking on roles in commercial, product management, and marketing. He has worked in the specialty chemicals, biotechnology, and pharmaceutical markets in Germany and the UK, where he presently resides. He is currently the Director of Global Market Development in the Laboratory Chemicals Division at Thermo Fisher Scientific™ which put him in the host chair of the Bringing Chemistry to Life podcast. A busy father of four, in what little free time he has, you'll find him inventing electronic devices with the help of his loyal 3D-printer and soldering iron. And if you ask him, he'll call himself a “maker” at heart.

This audio is brought to you by Wearcheck, your condition monitoring specialist. Germany's Heraeus Precious Metals and South Africa's Sibanye-Stillwater are partnering to explore new applications for platinum-group metals (PGMs) in the hydrogen economy, with a specific focus on how applications can profit from the unique traits of palladium, one of the six PGM elements. Currently, it is platinum and iridium PGMs that dominate in the hydrogen space. However, this is the second joint effort by Heraeus and Sibanye to develop new PGM markets. The first centred on the introduction of a ruthenium-based catalyst to reduce reliance on iridium for proton exchange membrane (PEM) water electrolysis. Ruthenium is another of the six PGM elements and the ruthenium-based catalyst emergence uplifts the sustainability of hydrogen production hugely by greatly reducing material cost and slashing reliance on highly scarce and very expensive iridium. Now, the aim of the latest equally funded PGM-balancing project is to develop alternative markets for palladium and support the emerging hydrogen sector with technical innovations. Increasing demand for hydrogen purification during the production of blue hydrogen is one possible example of a palladium-based application. Further examples include the cracking of hydrogen carriers as well in the semiconductor industry, where high-purity hydrogen is needed as a process gas. When moving technologies to scale, reliable process efficiency is key, and PGMs are seen as a provider of this. "Together with Heraeus Precious Metals, we invest in new technologies that leverage the unique characteristics of PGM's in line with our company purpose of combatting climate change and fostering the sustainability of the industry," Sibanye-Stillwater CEO Neal Froneman emphasised. "We expect hybrids to become the dominant engine type underpinning demand for palladium in the medium term. Longer term and in response to changing demands, the PGM industry must innovate and stabilise the platinum group metals market," Froneman added. Hydrogen has emerged as a fundamental element in the energy transition, with the Hydrogen Council expecting capacities of 175 GW by 2030. Notably, 40% of this future capacity will be produced using PEM electrolysis. "We're doing our part in the energy transition by bringing precious metal solutions to hydrogen technologies and enabling performance at scale," was the comment of Heraeus Precious Metals Business Line Hydrogen Systems head Dr Philipp Walter. BALANCING PGM SUPPLY BASKET Palladium demand has been dominated by autocatalysis for the past few decades and palladium remains critical to emissions control in both internal combustion engine and in hybrid vehicle engines, but the special physical and chemical characteristics this PGM possesses lend themselves to wider industrial applications. Over the longer term, demand for palladium in the automotive sector is expected to decrease, creating an opportunity to consider new applications for palladium that will not only benefit downstream industry users, but also ensure sustainable demand for the metal. With their partnership, the two companies aim to ensure a sustainable PGM supply basket. Major ingredients of the mined PGMs basket include palladium and platinum along with critical materials, like iridium, ruthenium and rhodium and to ensure market demand for these materials can be met requires sufficient demand for all metals to be sustained in the long term. While the emerging green hydrogen and fuel cell market offers high potential for increasing demand for platinum, opportunity exists for the partnership to develop and scale corresponding applications for palladium, the companies stated in a joint release. With about 3 000 employees at 15 sites worldwide, including a presence in South Africa's Gqeberhe and in Boksburg, Heraeus Precious Metals offers products essential for the automotive, chemicals, semiconductor, pharmaceutical, hydrogen and ...

This audio is brought to you by Wearcheck, your condition monitoring specialist,. Green hydrogen generation received a major boost on Tuesday with the introduction of a far-reaching iridium-thrifting breakthrough by Germany's Heraeus Precious Metals in collaboration with South Africa's Sibanye-Stillwater. The introduction of the new ruthenium-based catalyst for proton exchange membrane (PEM) water electrolysis crucially improves the sustainability of climate-critical hydrogen production by reducing material cost and the reliance on iridium, a highly scarce and expensive platinum group metal (PGM). Primary production of ruthenium, also a PGM, is 3.5 times that of iridium. The unveiling of the quantum leap at the P2X conference in Frankfurt on Tuesday coincides with green hydrogen emerging as the indispensable element of a genuinely green and clean energy transition. Moreover, the global Hydrogen Council has announced expectation of capacities of 175 gigawatts (GW) of the lightest element by 2030. Hugely important for PGMs demand is that 40% of this future hydrogen capacity is poised to brought about by PGM-based PEM electrolysis, a technology that has up to now been constrained by iridium's extremely limited supply. With only about nine metric tons of iridium mined annually and widespread utilisation in various industries, supply bottlenecks were feared - until the latest breakthrough. Currently, about 400 kg of iridium is required to build one GW of capacity. A reduction to less than 100 kg per GW is necessary to avoid supply bottlenecks. Heraeus' latest innovation, in collaboration with Sibanye-Stillwater, presents an 85% saving on iridium compared with an iridium oxide catalyst, alleviating the potential supply concerns. Alongside iridium, ruthenium also catalyses the oxygen evolution reaction (OER), which is the critical stage in PEM electrolysis. Ruthenium possesses superior catalytic activity to iridium but lacks stability in the challenging conditions of a PEM electrolyser stack. The Heraeus concept solves this problem by combining both ruthenium and iridium oxide in a novel manner, enhancing stability while maintaining the increased catalytic activity provided by ruthenium. This ruthenium-iridium oxide material class delivers an unprecedented activity boost. The catalyst can achieve up to 50 times higher mass activity than iridium oxide, and unlike ruthenium oxide alone, it remains stable in operational conditions. Accelerated degradation tests confirmed its stability after 30 000 cycles, presenting activity loss significantly lower than for ruthenium oxide and on par with iridium oxide. These findings were verified by Mattiq, a start-up based in Chicago, US, which combined industry expertise in chemistry and materials science and performed high throughput screening experiments for the development project. By including ruthenium, Heraeus not only helps mitigate potential supply bottlenecks but also brings significant commercial benefits. By implementing this breakthrough, a significant 90% reduction in capital expenditure on material costs can be achieved, ensuring hydrogen production becomes more economically feasible and efficient. "The dramatic reduction in capital expenditure needed per GW enabled by our new ruthenium-based catalyst not only addresses the iridium supply problem but also makes economic sense. It is solutions like these that will champion the necessary scale-up of the hydrogen industry, bringing us closer to achieving our global green energy goals," Heraeus Precious Metals EVP new business development Dr Philipp Walter stated in a media release to Mining Weekly. Sibanye-Stillwater CEO Neal Froneman added: "As the largest producer of primary iridium globally, we firmly believe that sustainable demand of these metals, with supply in mind, is beneficial for the entire industry. The commendable progress achieved by Heraeus in their work to date is encouraging, and we highly value our partnership in thi...

Der hersker en teori om, at vand på jorden kommer fra meteorer fra det ydre solsystem. Her kan grundstoffet ruthenium være behjælpelig. Eller rettere: En anomali af grundstoffet. Så den danske geolog Kristoffer Szilas drager til Grønland for at blive klogere på jordens "genfødsel" for 4,5 milliarder år siden. Periodisk – en RAKKERPAK original produceret af RAKKERPAK Productions.Historierne du hører bygger på journalistisk research og fakta. De kan indeholde fiktive elementer som for eksempel dialog.Hvis du kan lide min fortælling, så husk at gå ind og abonnér, give en anmeldelse og fortæl dine venner om Periodisk.Podcasten er blevet til med støtte fra Novo Nordisk Fonden. Hvis du vil vide mere kan du besøge vores website periodisk.dkAfsnittet er skrevet og tilrettelagt af Mads G LadekarlTor Arnbjørn og Dorte Palle er producereRene Slott står for lyddesign og mixSimon Bennebjerg er vært

In this episode, we are joined by Professor Tuomas Sandholm of UC Berkeley. Tuomas talks about his work on smiths and how garrulousness is related to the metal ruthenium.

Shadowrun Episode 22 - Rough Streets: Brought to you by... "Clubbin' with sasqautch" and "Ruthenium wedding rings" concealed commitment for the modern age. Deniable assets hired to do off-grid jobs - this time it's deeper into the rough streets of the Redmond Barrens in this futuristic cyberpunk high fantasy mash-up that is the world of Shadowrun. *WARNING* *Please be advised the topic of suicide does come up in this episode of our actual play tabletop rpg - if you or someone you know struggles with depression and thoughts of self-harm please know you do not need to be alone and should seek professional supports. We love you and thank you for your time. Take care.* Thanks for watching our actual play rpg game - if you liked, please follow or drop by during our live games. Roll some dice, stay safe, be well and see you soon. Cheers. This is our Shadowrun 5e homebrew game, episodic adventures in the 6th world. If you enjoy, give us the follow/sub and feel free to join us live on the stream on twitch.tv/sidequestslive.   * * * * * * * * * * * * * * * * * * * * * * * * * * *Cast of Characters * * * * * * * * * * * * * * * * * * * * * * * * * * *Bela, "Bl155" Human TechnomancerDarcy, "Mx." Human Face (adept)Gemini Twin,  "Sharps" Human Street SamuraiSteve, "His Majesty the Sasquatch", Sasquatch MuscleYowfin, "Dino" Troll Street ShamanTodd, Gamemaster* * * * * * * * * * * * * * * * * * * * * * * * * * *Thanks for watching to our actual play tabletop roleplaying game! To find more content, including our to our podcast edition, our live games on Twitch, our social media things and more, check out our links at https://linktr.ee/sidequestslive If you enjoyed, please click subscribe, or on Twitch the follow or sub. You're also invited to send us comments or reviews, we'd really appreciate your support. And special thanks to those joining us on the live stream, cheering us, subbing, following and chatting with us during our games. Our schedule is a bit all over due to the holidays, but we will return to a weekly DnD game and alternating Shadowrun games in the new year. All the best, be safe, have fun. Cheers. ------------------------------------------------------------*Images and music used are Creative Commons. *Character art is by @boydsscratchings (instagram) / @darcybits (twitch). *All Music and visuals attributions are included at the end credits of our visual feed (YouTube, Twitch VOD) *All music is creative commons with attribution, licensed for broadcast, or otherwise paid for Monstercat gold*  *Other images are from Pixabay.  *Special Thanks goes to all content creators, especially those at filmmusic.io.  ******We are not endorsed by nor affiliated with any respective copyright holders (Catalyst games, Wizards of the Coast, etc.). Find updates on Twitter & Instagram: @sidequestslive------------------------------------------------------------

Im Zeitraum um den 16. und 17. Juni 2020 wurden in verschiedenen nordischen Überwachungsstationen (Finnland, Schweden und Norwegen) verschiedene Spaltprodukte in der Atmosphäre gemessen. Es handelte sich um einen Cocktail aus Cäsiums-134, Cäsiums-137 und Ruthenium-103. Zusätzlich wurde an anderen Tagen weiter nördlich Iod-131 und diverse Cobalt-Isotope gemessen. Alles weit unterhalb einer Gefährdung der Bevölkerung. Soweit eine beruhigende Nachricht. Der Text wurde veröffentlicht auf: http://www.nukeklaus.net/2020/06/28/wieder-einmal-besorgnis-erregende-meldungen-aus-russland/adminklaus/

Ruthenium is a 'sort of' precious metal that is a useful catalyst and alloy. It is toxic and smells like ozone, says Allan Blackman from AUT in ep 71 of Elemental.

Ruthenium is a 'sort of' precious metal that is a useful catalyst and alloy. It is toxic and smells like ozone, says Allan Blackman from AUT in ep 71 of Elemental.

Ruthenium is a 'sort of' precious metal that is a useful catalyst and alloy. It is toxic and smells like ozone, says Allan Blackman from AUT in ep 71 of Elemental.

Element 44 is technically not named for Russia... but perhaps it should be.

In Episode 82, Mario discusses a mysterious radioactive cloud of Ruthenium 106 that drifted over Europe in the fall of 2017. It was determined that it posed no harm to people or the environment in Europe but it was never determined from where it came or what caused it. Chloe tells us about 17 cryptic coffins found in Scotland in the 19th century. She details some theories as to who made them and why.Thanks for listening y’all! We super appreciate it!Mario & ChloeTeam Mystery See acast.com/privacy for privacy and opt-out information.

Themen: Was macht die Dürre mit den Lebewesen im Erdreich?; Daniels Hausbesuch beim Gesellschaftsforscher; Die Zukunft des rheinischen Braunkohlereviers; Pflanzen - schlauer als gedacht?; Wer waren die Philister - und woher kamen sie?; Drei Dinge über Spucke; Radioaktives Ruthenium über Europa: Rätsel gelöst?; Recycling-Beton im Test; Tor zum Rhein auf für Lachs und Co.; Einmaliges Forschungsprojekt zum Anbau von Urgetreide; Luna oder der Mond kommt nach Köln; Moderation: Marija Bakker

This Week's Featured Interview: Award-winning journalist Karl Grossman shares insights on the Indian Point Closure agreement, the hidden manipulation tactics of the Institute of Nuclear Power Operators, and gives us examples of how activists have successfully scuttled nuclear industry plans.An Encore presentation from Nuclear Hotseat, #295, February 14, 2017. Karl Grossman's Links: Article – “An...

Award-winning journalist Karl Grossman shares insights on the Indian Point Closure agreement, the hidden manipulation tactics of the Institute of Nuclear Power Operators, and gives us examples of how activists have successfully scuttled nuclear industry plans. An Encore presentation from Nuclear Hotseat, #295, February 14, 2017. After two months of lies, Russia finally admits that cloud of Ruthenium 106 at radiation nearly 1000x background originated from its Mayak nuclear waste reprocessing center. With a half-life of just over one year, and ten half-life cycles necessary to become non-radioactive, we're looking at 10 years of radiation contamination... so far.

Award-winning journalist Karl Grossman shares insights on the Indian Point Closure agreement, the hidden manipulation tactics of the Institute of Nuclear Power Operators, and gives us examples of how activists have successfully scuttled nuclear industry plans. An Encore presentation from Nuclear Hotseat, #295, February 14, 2017. After two months of lies, Russia finally admits that cloud of Ruthenium 106 at radiation nearly 1000x background originated from its Mayak nuclear waste reprocessing center. With a half-life of just over one year, and ten half-life cycles necessary to become non-radioactive, we're looking at 10 years of radiation contamination... so far.

Award-winning journalist Karl Grossman shares insights on the Indian Point Closure agreement, the hidden manipulation tactics of the Institute of Nuclear Power Operators, and gives us examples of how activists have successfully scuttled nuclear industry plans. An Encore presentation from Nuclear Hotseat, #295, February 14, 2017. After two months of lies, Russia finally admits that cloud of Ruthenium 106 at radiation nearly 1000x background originated from its Mayak nuclear waste reprocessing center. With a half-life of just over one year, and ten half-life cycles necessary to become non-radioactive, we're looking at 10 years of radiation contamination... so far.

Professor Poliakoff and Ruthenium - discovered by Karl Claus and named after Russia. More Christmas stuff at http://periodicvideos.blogspot.co.uk/... The Professor thanks the Academy of Sciences of the Republic of Tatarstan for its help.

With tracks from Cantoma, Savile & Olin, Chamboché, Hrdvsion, Al Kent, LTJ Xperience, Rory Phillips, It's A Fine Line, Axel Le Baron & Kurbatov, Hardway Bros, Bot'ox, Raz Ohara, Infant Presents Simon Baker, Dead Rose Music Company, Cottam, Max Sedgley, Guillaume & The Coutu Dumonts, NR& (Nomi, Rampa, &Me), Joash and Gerry Diver. Contact: dj@ribeaud.ch.

Pulp-O-Mizer cover for “The Hunt For Count Ruthenium” Recorded LIVE at Revel Theatre’s Barn Burner show at Unit 102 in Toronto, Ontario, Canada, on Feb. 10, 2013, it’s another unscripted adventure from Illusionoid! From the audience suggestions of “Count” and … Continue reading →

Why chlorophyll and hence plants, looks green.

Fri, 3 Sep 2010 12:00:00 +0100 https://edoc.ub.uni-muenchen.de/13153/ https://edoc.ub.uni-muenchen.de/13153/1/Giglmeier_Helene.pdf Giglmeier, Helene ddc:540, ddc:500, Fakultät für Chemie und Pharmazie

Ruthenium podcast from Chemistry World - the magazine of the Royal Society of Chemistry.

The Show Notes:IntroParsec NominationsAcoustic duo vs. PFAOccasional Songs for the Periodic TableCobalt, Nickel, Copper, Zinc, Gallium, Germanium, Arsenic, Selenium, Bromine, Krypton, Rubidium, Strontium, Yttrium, Zirconium, Niobium, Molybdendum, Technetium, Ruthenium, Rhodium, Palladium, SilverA Super Magumba Ask George - Matt Frewer? Marty Gordon- Tom Cruise and Germany? Mike Lee- Ukrainian? Steven Novak- Accents and the other e-mail? Terence Praet - Real piano vs. fake piano? Mat from London- Prime Number? Light Twinkie? Clair High- The J. Foster Interrogatories of DOOMMinoishe Interroberg's To Make with the Good English- Meteoric Rise Paul Minturn- Oriented vs. Orientated V. Ross- For the longest time Jill Arroway- Sketchy vs. Shady, not gonna lie Terence, again- I could care less, For all intensive purposes Jay Parlar- The EX factor Paul MakiShow Close......................................Mentioned in the show: Skepticality, the Philadelphia Funk Authority.And as always: George's blog, website, flickr, and myspace page. Have a comment on the show, a topic for Minoishe Interroberg, or a question for Ask George? Drop George a line at geo@geologicrecords.net or through his blog.Have any comments?

In der vorliegenden Arbeit werden stabile Übergangsmetall-Komplexe der d6-konfigurierten Metalle Rhenium(1), Ruthenium(2), Rhodium(3) und Iridium(3), sowie von Rhodium(1), Iridium(1), Palladium(2) und Platin(2) mit d8-Konfiguration hergestellt. Als Liganden kommen zweizähnige, aromatische N,N'- und N,P-Liganden ohne weitere funktionelle Gruppen zum Einsatz, bei denen die beiden Donor-Atome in einer 1,4-Relation zueinander stehen. Die gebildeten 5-Ring-Metallacyclen weisen entsprechend der beiden unterschiedlichen Donor-Atome zwei verschieden stark gebundene Koordinationsstellen auf. Die aus dieser Konstellation resultierenden Eigenschaften der isolierten Komplexe werden spektroskopisch (IR-, 1H-NMR, 13C-NMR, 31P-NMR) untersucht und die Molekülstrukturen durch Einkristall-Röntgenstrukturanalyse ermittelt. Bei den untersuchten relativ stabilen Systemen kann der Ligandenaustausch so gesteuert werden, dass voll charakterisierbare Spezies erhalten werden. Diese sollen das Verständnis katalytischer Reaktionen in labileren Systemen vertiefen, welche auch durch Modifikation der vorgestellten Liganden zugänglich sind.

1. Der Sulfoxid/Lithium-Austausch an planar chiralen Ferrocenen wurde eingehend untersucht. So konnte ein P,N-Ligand hergestellt werden, der in der Palladium-katalysierten allylischen Alkylierung Enantiomerenüberschüsse bis zu 86% ee und in der allylischen Aminierung bis zu 83% ee lieferte. 2. Heterocyclische Liganden vom TANIAPHOS-Typ wurden hergestellt und in Ruthenium und Rhodium-katalysierten Hydrierungen untersucht. 3. Verschiedene Metallocenylketone wurden durch eine Mg-Oppenauer-Oxidation hergestellt. Die CBS-Reduktion von Tricarbonylchromkomplexen mit anschließender Dekomplexierung wurde als eine allgemeine Möglichkeit zur Darstellung chiraler Benzyhydrolderivate beschrieben. 4. Mit (-)-DAIB wurden durch asymmetrische Addition des Reformatsky-Reagenzes an verschiedene Aldehyde Hydroxyester mit sehr guter Selektvitität hergestellt. Die höchste Enantioselektivität wurde mit schwefelhaltigen Aldehyden (93% ee) erreicht.

Tue, 18 Oct 2005 12:00:00 +0100 https://edoc.ub.uni-muenchen.de/4396/ https://edoc.ub.uni-muenchen.de/4396/1/Barth_Michael.pdf Barth, Michael ddc:540, ddc:500, Fakultät für Chemie und Pharmazie

Mon, 7 Feb 2005 12:00:00 +0100 https://edoc.ub.uni-muenchen.de/3432/ https://edoc.ub.uni-muenchen.de/3432/1/Schmid_Alexander.pdf Schmid, Alexander ddc:540, ddc:500, Fakultät für Chemie und

Thu, 27 Jan 2005 12:00:00 +0100 https://edoc.ub.uni-muenchen.de/3391/ https://edoc.ub.uni-muenchen.de/3391/1/Greber_Gabriele.pdf Greber, Gabriele ddc:610, ddc:600

In der vorliegenden Arbeit wurden die Synthese, Charakterisierung, Reaktivität und katalytische Aktivität von metallorganischen Verbindungen mit natürlichen und nichtnatürlichen α-Amino-Carboxylatliganden vorgestellt.

Hydrocarbon-Bridged Complexes, XXX. - Nucleophilic Addition of Carbonylmetallates to Cationic Vinyl, Diene, Dienyl and Triene Complexes of Iron, Ruthenium and Cobalt: Di-, Tri-, Tetra- and Pentametallic Complexes with ,- and ,-Hydrocarbon Bridges[Note ][Herrn Professor Ekkehard Lindner zum 60. Geburtstag gewidmet.] The reactions of [Re(CO)5]-, [Ru(CO)2Cp]-, and [Os(CO)4]2- with [Cp2(OC)2Fe2(-CO)(-1:2-CH=CH2)]+, [Cp*Ru(2:4-1,3,7-octatriene)]+, [(OC)Fe(4-diene)(5-cycloheptadienyl)]+, and [CpCo(5-cyclodienyl)]+ give the nucleophilic adducts whereas with [Mn(CO)5]-, [W(CO)3Cp]-, and [Fe(CO)2Cp]- formation of the corresponding C-C coupling products and of the metal-metal-bonded dimers is observed. The structures of Cp*Ru(-1:2:3-1,5-octadienyl)Re(CO)5 (4), [Cp* Ru(-1:2:3-1,5-octadienyl)]2Os(CO)4 (6), and of (OC)-Fe(4-1,3-cyclohexadiene) (-1:4-1,3-cycloheptadiene)Re(CO)5 (9) have been determined by X-ray diffraction.

Abstract: Bovine chromaffin secretory vesicle ghosts loaded with Na+ were found to take up Ca2+ when incubated in K+ media or in sucrose media containing micromolar concentrations of free Ca2+. Li+- or choline+loaded ghosts did not take up Ca2+. The Ca2+ accumulated by Na+-loaded ghosts could be released by the Ca2+ ionophore A23187, but not by EGTA. Ca2+ uptake was inhibited by external Sr2+, Na +, Li +, or choline +. All the 45Ca2+ accumulated by Na+-dependent Ca2+ uptake could be released by external Na +, indicating that both Ca2+ influx and efflux occur in a Na+-dependent manner. Na + -dependent Ca2+ uptake and release were only slightly inhibited by Mg2+. In the presence of the Na+ ionophore Monensin the Ca2+ uptake by Na +-loaded ghosts was reduced. Ca2+ sequestered by the Na+-dependent mechanism could also be released by external Ca2+ or Sr2+ but not by Mg2+, indicating the presence of a Ca2+/Ca2+ exchange activity in secretory membrane vesicles. This Ca2+/Ca2+ exchange system is inhibited by Mg2+, but not by Sr2+. The Na + -dependent Ca2+ uptake system in the presence of Mg2+ is a saturable process with an apparent Km of 0.28 μM and a Vmax= 14.5 nmol min−1 mg protein−1. Ruthenium red inhibited neither the Na+/Ca2+ nor the Ca2+/Ca2+ exchange, even at high concentrations.