Abstract

The water soluble monobenzene complex of ruthenium, [Ru(η 6-C 6H 6)(CH 3CN) 3](BF 4) 2 ( 1) is an effective catalyst or catalyst precursor for the hydrogenation of olefinic functions in benzene/H 2O biphasic medium. The catalyst can be recycled by simple decantation. Complex 1 is capable of catalyzing H/D exchange reaction between H 2 and D 2O. A two-loop reaction mechanism for the catalytic hydrogenation reactions with 1 is postulated. In this mechanism, water acts as the base to assist the heterolytic hydrogen cleavage in one of the loops, but is not an active participant in the other.

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