Abstract
One previously known and three novel quinolinyl phosphanes were synthesized by either a reaction between a lithiated diphenylphosphane and the appropriate chloroquinoline or by a reaction between a lithiated haloquinoline and an arylchlorophosphane. The reaction of the quinolinyl phenylphosphane ligands with PdCl 2(cod) produced monomeric palladium complexes in diethyl ether and dimeric, chlorine-bridged complexes in dichloromethane. Crystal structures of the palladium complexes confirm that the quinolinyl phenylphosphanes do not form chelated structures while bonded to the metal centre. 2-Quinolinyl(diphenyl)phosphane has a tendency to form a cis-isomer while bonded to the metal centre in the mononuclear complex due to attractive interactions between two ligands. A catalytic study showed that the quinolinyl phenylphosphane ligands are moderately active in the Suzuki–Miyaura coupling of various aryl halides in air.
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