Conjugate phosphination of cyclic and acyclic acceptors using Rh(I)–phosphine or Rh(I)–carbene complexes. Probing the mechanism with chirality at the silicon atom or the phosphorus atom of the Si–P reagent
作者:Verena T. Trepohl、Roland Fröhlich、Martin Oestreich
DOI:10.1016/j.tet.2009.04.038
日期:2009.8
The Rh(I)-catalyzed conjugate phosphinyl transfer from an Si–P reagent to an electron-deficient acceptor requires individual protocols for cyclic and acyclic α,β-unsaturatedcarbonyls and carboxyls. While 1,4-addition to cyclic acceptors is catalyzed by a Rh(I)–phosphine complex, a Rh(I)–carbene complex is needed to promote conjugate phosphination of acyclic acceptors. General procedures for both systems
[EN] SULFONATED ORGANOPHOSPHINE COMPOUNDS AND USE THEREOF IN HYDROFORMYLATION PROCESSES<br/>[FR] COMPOSÉS D'ORGANOPHOSPHINE SULFONÉE ET LEUR UTILISATION DANS DES PROCÉDÉS D'HYDROFORMYLATION
申请人:DOW GLOBAL TECHNOLOGIES INC
公开号:WO2009091670A1
公开(公告)日:2009-07-23
A compound comprising a class of sulfonated triorganophosphine compounds of formula R1R2P-R3[-O-(CH2)n-(SO3M)]m, wherein the R1 and R2 are selected individually from alkyl, aralkyl, and alicyclic groups, wherein R3 represents a divalent or polyvalent alkylene or alicyclic radical that is bonded to the phosphorus atom and to one or more sulfonate substituents via an alkylether link, and further wherein R3 does not contain any aryl moieties; n is an integer reflecting a number of methylene groups in the alkylether link; M represents a monovalent cation; and m is an integer representing a total number of sulfonated alkylether substituents. The compound is useful as a ligand in transition metal-ligand complex catalysts that are capable of catalyzing the hydroformylation of an olefinically-unsaturated compound with carbon monoxide and hydrogen to form one or more corresponding aldehyde products. The ligand is incapable of alky-aryl exchange, thereby leading to reduced ligand usage and improving ligand and rhodium recovery and recycling.
Tertiary phosphines and their methods of preparation
申请人:Bradaric-Baus J. Christine
公开号:US20070037981A1
公开(公告)日:2007-02-15
Tertiary phosphines are prepared by reacting a phosphine (PH
3
or a primary or secondary phosphine) with a cyclic alpha,beta-unsaturated carbonyl compound having no more than one C═C double bond conjugated with a carbonyl group. The inventive tertiary phosphines can have R groups that are the same or different. The inventive tertiary phosphines may be used as ligands for metal catalysts or as starting materials for preparing phosphonium salts or ylids.