Preparation of carbonyl phosphine rhodium complexes with dithiolate bridges. Application as catalyst precursors in the hydroformylation of 1-hexene

Article abstract of DOI:10.1016/0022-328X(94)05143-Y

The reactivity of (n = 2, 3 0r 4) have been investigated and mixed carbonyl phosphine complexes x (R = C6H5, C6H11, O-2-^tBuC6H4; n = 2, 3 and 4; x = 1 or 2) have been prepared and studied by IR, 31P-<1H> NMR and FAB mass spectrometry.Dinuclear complexes (R = C6H5, C6H11, O-2-^tBuC6H4) and tetranuclear <tBuC6H4)3>2>2> formulations are proposed on the basis of FAB mass spectrometry. The complexes (n = 2, 3 or 4; COD = 1,5-cyclooctadiene) have been used as catalyst precursors for 1-hexene hydroformylation.The influence of different dithiolates and phosphines on the catalytic activity and the selectivity have been explored. Keywords: Rhodium; Hydroformylation; Dithiolate bridges; Catalysis