Palladium(II) complexes of 2-, 3-, and 4-quinolinyl(diphenyl)phosphane and di-(3-quinolinyl)phenylphosphane: Synthesis, characterization, and catalytic screening |
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| Authors: | Juho Autio M Haukka |
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| Institution: | a Department of Chemistry, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
b Department of Chemistry, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu, Finland |
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| 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 PdCl2(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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| Keywords: | Palladium complexes Cross-coupling reactions Quinolinyl phosphane ligands Crystal structures |
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