The reaction of
[(η5-Ph4C4COHOCC4Ph4-η5)(μ-H)[(CO)4Ru2]
(1) with several alkynes was
studied. Two new types of Ru complexes,
[(η5-Ph4C4CO)(CO)2RuC(Ph)=CPh]
(6) and [(η5-Ph4C4COH)(CO)2
RuC(CO2Me)=CHCO2Me]
(7), were isolated and structurally
characterized
by single-crystal X-ray crystallography. These complexes were
found to be implicated in
the hydrogenation of alkynes with 1 as a catalyst precursor.
While complex 7 was found to
function as a catalyst in the hydrogenation cycle, complex 6
acts as a catalysis poison by
virtue of its stability and irreversible formation. A catalytic
cycle has been proposed.
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