James P. Collman | |
---|---|
Born | 1932 (age 91–92) |
Alma mater | University of Nebraska–Lincoln (BS, MS) University of Illinois at Urbana–Champaign (PhD) |
Scientific career | |
Fields | Bioinorganic chemistry, organometallic chemistry |
Institutions | University of North Carolina at Chapel Hill, Stanford University |
Thesis | The Magnesium Enolate of 2,2-Diphenylcyclohexanone (1958) |
Doctoral advisor | Reynold C. Fuson |
Doctoral students | Penelope Brothers, Kim Kimoon, Hilary Godwin, Jack R. Norton, Kenneth S. Suslick, Jonathan Sessler |
Other notable students | Robert H. Grubbs, Karl Barry Sharpless |
James P. Collman (born 1932) is an American chemist who is the George A. and Hilda M. Daubert Professor of Chemistry, emeritus at Stanford University. Collman's research focused on organometallic bioinorganic chemistry. [1] Collman is a member of the National Academy of Sciences. [2]
Collman was born in 1932, in Beatrice, Nebraska.
Collman received B.S. (1954) and M.S. degrees (1956) in chemistry from the University of Nebraska–Lincoln. He received a Ph.D. degree from the University of Illinois at Urbana–Champaign in 1958 under Reynold C. Fuson. After serving as an Instructor at the University of North Carolina at Chapel Hill for one year, he was hired as an assistant professor in 1959. [3] Collman was promoted to associate professor in 1962, then full professor in 1966. [4] In 1967, he moved to Stanford University. He was promoted to George A. & Hilda M. Daubert Endowed Chair in Chemistry in 1980, and is now professor emeritus.
Collman has contributed to several aspects of transition metal chemistry, as documented in over 366 scientific papers.
In the 1960s his group demonstrated that certain metal acetylacetonates undergo Friedel-Crafts-like reactions, indicating that these chelate rings have aromatic character.
In the area of organometallic chemistry, through reviews as well as original research, his group popularized the oxidative addition reaction, leading to the discovery of new low-valent complexes including Ru(CO)3(PPh3)2 and IrCl(N2)(PPh3)2. [5] Collman's reagent, Na2Fe(CO)4, prepared in his laboratories, enables certain C-C coupling reactions in organic synthesis. He coauthored an influential textbook, Principles and Applications of Organotransition Metal Chemistry, that went through three editions. [6]
He popularized the use of tetraphenylporphyrin as a biomimetic ligand for exploring the structure and function of myoglobin, cytochrome P450, and cytochrome oxidase. [7]
Collman has advised many academic researchers, many of whom have gone on to notable careers. Two of his postdoctoral researchers at Stanford, Karl Barry Sharpless and Robert H. Grubbs, later received Nobel Prizes in Chemistry.
Henry Taube, was a Canadian-born American chemist who was awarded the 1983 Nobel Prize in Chemistry for "his work in the mechanisms of electron-transfer reactions, especially in metal complexes." He was the second Canadian-born chemist to win the Nobel Prize, and remains the only Saskatchewanian-born Nobel laureate. Taube completed his undergraduate and master's degrees at the University of Saskatchewan, and his PhD from the University of California, Berkeley. After finishing graduate school, Taube worked at Cornell University, the University of Chicago and Stanford University.
Oxidative addition and reductive elimination are two important and related classes of reactions in organometallic chemistry. Oxidative addition is a process that increases both the oxidation state and coordination number of a metal centre. Oxidative addition is often a step in catalytic cycles, in conjunction with its reverse reaction, reductive elimination.
Wilkinson's catalyst (chloridotris(triphenylphosphene)rhodium(I)) is a coordination complex of rhodium with the formula [RhCl(PPh3)3], where 'Ph' denotes a phenyl group. It is a red-brown colored solid that is soluble in hydrocarbon solvents such as benzene, and more so in tetrahydrofuran or chlorinated solvents such as dichloromethane. The compound is widely used as a catalyst for hydrogenation of alkenes. It is named after chemist and Nobel laureate Sir Geoffrey Wilkinson, who first popularized its use.
Vaska's complex is the trivial name for the chemical compound trans-carbonylchlorobis(triphenylphosphine)iridium(I), which has the formula IrCl(CO)[P(C6H5)3]2. This square planar diamagnetic organometallic complex consists of a central iridium atom bound to two mutually trans triphenylphosphine ligands, carbon monoxide and a chloride ion. The complex was first reported by J. W. DiLuzio and Lauri Vaska in 1961. Vaska's complex can undergo oxidative addition and is notable for its ability to bind to O2 reversibly. It is a bright yellow crystalline solid.
Robert Howard GrubbsForMemRS was an American chemist and the Victor and Elizabeth Atkins Professor of Chemistry at the California Institute of Technology in Pasadena, California. He was a co-recipient of the 2005 Nobel Prize in Chemistry for his work on olefin metathesis.
Robert Howard Crabtree is a British-American chemist. He is serving as Conkey P. Whitehead Professor Emeritus of Chemistry at Yale University in the United States. He is a naturalized citizen of the United States. Crabtree is particularly known for his work on "Crabtree's catalyst" for hydrogenations, and his textbook on organometallic chemistry.
Malcolm Leslie Hodder Green was Professor of Inorganic Chemistry at the University of Oxford. He made many contributions to organometallic chemistry.
Disodium tetracarbonylferrate is the organoiron compound with the formula Na2[Fe(CO)4]. It is always used as a solvate, e.g., with tetrahydrofuran or dimethoxyethane, which bind to the sodium cation. An oxygen-sensitive colourless solid, it is a reagent in organometallic and organic chemical research. The dioxane solvated sodium salt is known as Collman's reagent, in recognition of James P. Collman, an early popularizer of its use.
Robert George Bergman is an American chemist. He is Professor of the Graduate School and Gerald E. K. Branch Distinguished Professor Emeritus at the University of California, Berkeley.
Dioxygen complexes are coordination compounds that contain O2 as a ligand. The study of these compounds is inspired by oxygen-carrying proteins such as myoglobin, hemoglobin, hemerythrin, and hemocyanin. Several transition metals form complexes with O2, and many of these complexes form reversibly. The binding of O2 is the first step in many important phenomena, such as cellular respiration, corrosion, and industrial chemistry. The first synthetic oxygen complex was demonstrated in 1938 with cobalt(II) complex reversibly bound O2.
Organorhodium chemistry is the chemistry of organometallic compounds containing a rhodium-carbon chemical bond, and the study of rhodium and rhodium compounds as catalysts in organic reactions.
Anthony F. Hill is a Professor of Chemistry at the Research School of Chemistry of the Australian National University. He specializes in synthetic, organometallic and coordination chemistry. He is the author of a textbook on the subject of the organometallic chemistry of the transition metals and since 1995 has been an editor of the scientific journal/book series Advances in Organometallic Chemistry. He is a fellow of the Royal Society of Chemistry.
A metal-phosphine complex is a coordination complex containing one or more phosphine ligands. Almost always, the phosphine is an organophosphine of the type R3P (R = alkyl, aryl). Metal phosphine complexes are useful in homogeneous catalysis. Prominent examples of metal phosphine complexes include Wilkinson's catalyst (Rh(PPh3)3Cl), Grubbs' catalyst, and tetrakis(triphenylphosphine)palladium(0).
A metal-centered cycloaddition is a subtype of the more general class of cycloaddition reactions. In such reactions "two or more unsaturated molecules unite directly to form a ring", incorporating a metal bonded to one or more of the molecules. Cycloadditions involving metal centers are a staple of organic and organometallic chemistry, and are involved in many industrially-valuable synthetic processes.
John F. Hartwig is an American organometallic chemist who holds the position of Henry Rapoport Professor of Chemistry at the University of California, Berkeley. His laboratory traditionally focuses on developing transition metal-catalyzed reactions. Hartwig is known for helping develop the Buchwald–Hartwig amination, a chemical reaction used in organic chemistry for the synthesis of carbon–nitrogen bonds via the palladium-catalyzed cross-coupling of amines with aryl halides.
Jack Richard Norton is an American organometallic chemist and Professor at Columbia University. His research has focused on the studying the reactivity and properties of transition metal hydrides. He coauthored the textbook "Principles and Applications of Organotransition Metal Chemistry."
John A. Gladysz, an organometallic chemist, is a Distinguished Professor and holds the Dow Chair in Chemical Invention at Texas A&M University. Professor Gladysz is a native of the Kalamazoo, Michigan area. He obtained his B.S. degree from the University of Michigan (1971) and his Ph.D. degree from Stanford University (1974). He subsequently held faculty positions at UCLA (1974-1982) and the University of Utah (1982-1998). He then accepted the Chair of Organic Chemistry at the University of Erlangen-Nuremberg in Germany. In 2008, he returned to North America as a distinguished professor and holder of the Dow Chair in Chemical Invention at Texas A&M University.
Jonas C. Peters is the Bren Professor of Chemistry at the California Institute of Technology and Director of the Resnick Sustainability Institute. He has contributed to the development of catalysts and photocatalysts relevant to small molecule activation.
Transition metal acyl complexes describes organometallic complexes containing one or more acyl (RCO) ligands. Such compounds occur as transient intermediates in many industrially useful reactions, especially carbonylations.
In organometallic chemistry, a transition metal formyl complex is a metal complex containing one (usually) or more formyl (CHO) ligand. A subset of transition metal acyl complexes, formyl complexes can be viewed as metalla-aldehydes. A representative example is (CO)5ReCHO. The formyl is viewed as an X (pseudohalide) ligand. Metal formyls are proposed as intermediates in the hydrogenation of carbon monoxide, as occurs in the Fischer-Tropsch process.