Abstract
Cationic rhodium(I) complexes of the general formula [Rh(COD)L 2]ClO 4 (L 2 = bipyO 2, phenO, dpeO 2 and dpmO 2) are prepared from the solvated species [Rh(COD)(Me 2CO) x ] + and the appropriate ligand. Complexes of the type [Rh n (COD) n ](ClO 4) n (CNPyO = 4-cyano and 2-cyanopyridine N-oxide) are obtained similarly. Reaction of [RhCl(COD)] 2 with the potassium salt of 2-picolinic acid N-oxide leads to the neutral complex Rh(COOPyO)(COD). The mononuclear rhodium diolefinic compounds react with carbon monoxide to give complexes of the type [Rh(CO) 2L 2]ClO 4 and Rh(COOPyO)(CO) 2, which on treatment with triphenylphosphine yield monocarbonyl derivatives. The catalytic activities of the diolefin complexes and related derivatives in hydrogen-transfer catalytic reactions have been studied.
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