Journal ArticleDOI
A bimetallic hydroformylation catalyst: high regioselectivity and reactivity through homobimetallic cooperativity.
Melanie E. Broussard,Booker W. O. Juma,Spencer G. Train,Wei-Jun Peng,Scott A. Laneman,George G. Stanley +5 more
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TLDR
The racemic and meso diastereomers of an electron-rich binucleating tetraphosphine ligand have been used to prepare homobimetallic rhodium norbornadiene complexes, giving both a high rate of reaction and high regioselectivity for linear aldehydes.Abstract:
The racemic and meso diastereomers of an electron-rich binucleating tetraphosphine ligand have been used to prepare homobimetallic rhodium norbornadiene complexes. The racemic bimetallic Rh complex is an excellent hydroformylation catalyst for 1-alkenes, giving both a high rate of reaction and high regioselectivity for linear aldehydes, whereas the meso complex is considerably slower and less selective. A mechanism involving bimetallic cooperativity between the two rhodium centers in the form of an intramolecular hydride transfer is proposed. Mono- and bimetallic model complexes in which the possibility for bimetallic cooperativity has been reduced or eliminated are very poor catalysts.read more
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N-Heterocyclic Carbenes in Late Transition Metal Catalysis
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Hemilability of Hybrid Ligands and the Coordination Chemistry of Oxazoline‐Based Systems
Pierre Braunstein,Frédéric Naud +1 more
TL;DR: The definition and scope of hemilabile ligands are recalled, the main classes of ligands containing one or more oxazoline moieties are presented, with an emphasis on hybrid ligands, and why the combination of these two facets of ligand design appears particularly promising are explained.
Journal ArticleDOI
Progress in hydroformylation and carbonylation
TL;DR: The last 15 years of hydroformylation and carbonylation chemistry are reviewed in this article, including technical and commercial aspects, and the authors present a review of the most relevant papers.
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Cooperativity in Noncovalent Interactions.
References
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Journal ArticleDOI
Hydroformylation of alkenes by use of rhodium complex catalysts
TL;DR: The use of complexes of rhodium of the type trans-RhX(CO)(PR3)2, (X = halogen, R = aryl) as hydroformylation catalysts for alkenes is studied in this paper.
Journal ArticleDOI
The Reaction of Cobalt Hydrotetracarbonyl with Olefins
Richard F. Heck,David S. Breslow +1 more
Journal ArticleDOI
Paleoatmospheric Signatures in Neogene Fossil Leaves
TL;DR: Evidence from stomatal frequencies of fossil Quercus petraea leaves indicates that this relation can be applied as a bioindicator for changes in paleoatmospheric CO2 concentrations during the last 10 million years.
BookDOI
Transition states of biochemical processes
TL;DR: In this paper, the transition state is used as a basis for the design of enzymic inhibitors for enzyme-catalyzed reaction pathways, and transition state properties in Acyl and Methyl Transfer are investigated.