Collect. Czech. Chem. Commun. 1986, 51, 340-346

Rhodium-diphosphine tosylate complexes as hydrogenation catalysts

Jiří Reiss and Jiří Hetflejš

Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, 165 02 Prague 6-Suchdol


Novel rhodium-diphosphine tosylate complexes of the type [Rh(COD)L2]+ (O3SC6H4CH3-p)- (L2 = diphos, prophos, buphos, (-)-DIOP) have been prepared in high yields (87-92%) by the displacement of acac ligand from Rh(COD)(acac)by p-toluenesulphonic acid in the presence of L2. The complexes were found to be efficient hydrogenation catalysts comparable in activity to know cationic rhodium complexes. Some differences in the catalytic behaviour of both systems are reported, using hydrogenation of 1-octene and Z-α-acetamidocinnamic acid as model reactions.