Journal of molecular catalysis p. 1 - 5 (1993)
Update date:2022-09-26
Topics:
Takuma
Imaki
The novel phosphine compounds hexamethyl-1,5-bis[p- (diphenyphosphino)phenyl] trisiloxane (1) and 2,4,6,8-tetrakis [p-(diphenylphosphino)phenyl]-2,4,6,8- tetramethylcyclotetrasiloxane (2) containing two or more triphenylphosphine units were effective as ligands in catalysts for Grignard cross-coupling. Especially the palladium complex of cyclotetrasiloxane ligand 2 effectively catalysed the regioselective cross-coupling of allylic ethers with phenylmagnesium bromide to afford the non-terminal alkene.
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