25032-49-9Relevant articles and documents
Combining the reactivity properties of pcy3 and P t Bu3 into a single ligand, P(i Pr)(t Bu)2. reaction via mono- or bisphosphine palladium(0) centers and palladium(i) dimer formation
Proutiere, Fabien,Lyngvi, Eirik,Aufiero, Marialuisa,Sanhueza, Italo A.,Schoenebeck, Franziska
, p. 6879 - 6884 (2015/02/19)
Trialkylphosphine ligands are ubiquitous in catalysis. Via modulation of the steric bulk of these ligands, two central aspects that dictate reactivity and selectivity in catalysis can be controlled: i.e., the coordination sphere and favored oxidation stat
PROCESS FOR PRODUCING TERTIARY PHOSPHINE HAVING BULKY HYDROCARBON GROUP BONDED
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Page 21, (2008/06/13)
The present invention provides a production process by which tertiary phosphine with an attached sterically bulky hydrocarbon group, said tertiary phosphine being useful as a ligand of a transition metal catalyst in organic synthesis reactions, can be produced in a high yield and with high purity on an industrial scale through simple and safe operations. The present invention comprises allowing a dialkylphosphinous halide to react with a Grignard reagent in the presence of a copper compound in an amount corresponding to 0.1 to 5% by mol based on the dialkylphosphinous halide to produce tertiary phosphine represented by the following formula (3) : wherein R1 and R2 are each a tertiary hydrocarbon group of 4 to 13 carbon atoms, and R3 is an alkyl group, an alkenyl group, an aryl group or the like.
Extreme Steric Hindrance: Synthesis and Structure of the Tetra(tert-butyl)phosphonium Cation - a Case of T-Symmetry
Schmidbaur, Hubert,Blaschke, Guenther,Zimmer-Gasser, Beate,Schubert, Ulrich
, p. 1612 - 1622 (2007/10/02)
Starting from 3P and following a series of quaternisation and ylidation steps under carefully controlled conditions, the 4P+ cation could be synthesized for the first time: 3P -> 3PCH3+ -> 3P=CH2 -> 3PCH2CH3+ -> 3P=CHCH3 -> 3PCH(CH3)2+ -> 3P=C(CH3)2 -> 4P+.All intermediates were isolated.The tetra(tert-butyl)phosphonium cation was further characterized in the form of the iodide and tetrafluoroborate by means of all spectroscopic methods available.An X-ray diffraction analysis of the BF4 salt showed a face-centered cubic lattice with a superstructure (space group F - Td5).The cation has T-symmetry as predicted by theoretical force field calculations with a tert-butyl twist of 14 deg.Due to the extreme steric hindrance, the P - C bond distances are elongated and the C-C-C angles compressed.