Platinum complexes of heteroannularly bridged heterobidentate ferrocenyl diphosphine ligands: their molecular structure and their use in catalytic carbonylation reactions
作者:Thomas Sturm、Walter Weissensteiner、Kurt Mereiter、Tamás Kégl、György Jeges、György Petőlz、László Kollár
DOI:10.1016/s0022-328x(99)00584-7
日期:2000.1
Platinum complexes PtCl2(L) and PtCl(SnCl3)(L) of the ferrocenyl diphosphine ligands (L) (R,R)-1-diphenylphosphino-2,1'-[(1-diphenylphosphino)-1,3-propanediyl]-ferrocene (1), (R,R)-1-diphenylphosphino-2,1'-[(1-dicyclohexylphosphino)-1,3-propanediyl]ferrocene (2), (R,R)-1-bis(4-fluorophenyl)phosphino-2,1'-[(1-diphenylphosphino)-1,3-propanediyl]-ferrocene (3), have been synthesised. Complexes PtCl2(1) and PtCl2(2) have been structurally characterised by X-ray diffraction. Both the 'preformed' and the in situ catalysts have been used in hydroformylations of styrene. At low temperature (below 70 degrees C) and with use of the platinum catalysts the prevailing formation of (R)-2-phenyl-propanal was observed, while at higher temperatures the formation of the (S)-enantiomer was favoured. The palladium catalysts proved to be rather inactive in the hydromethoxycarbonylation of styrene. In the presence of ligand 2 the predominant formation of the linear regioisomer was observed. (C) 2000 Elsevier Science S.A. All rights reserved.