Add time:08/15/2019         Source:sciencedirect.com

A kinetic examination of the influence of phenyldibenzophosphole (DBF) on the catalytic activity of hydridotetrakis(triphenylphosphine)-rhodium(I) (HRh(PPh3)4) and of hydridocarbonyltris(triphenylphosphine)-rhodium(I) (HRh(CO)(PPh3)3) has been undertaken. The rate of hex-1-ene hydrogenation is increased significantly upon DBP addition when HRh(PPh3)4 is the catalyst precursor, but with HRh(CO)(PPh3)3 a pronounced deactivating effect of DBP is observed. This ‘selective poisoning’ of the carbonyl complex is ascribed to the inability of the monocarbonyl DBP complex to coordinate olefins.

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