Stoicheiometric dehydrogenation of cyclic alkenes without hydrogen acceptors using the ‘(C5Me5)Ru+’ fragment. X-Ray crystal structure of [(η5-C5Me5)Ru-(µ2, η5, η5-C5Me4OH)-Ru(η5-C5Me5)]CF3SO3·CH2Cl2
Bruno ChaudretFrançoise DahanXiao He
Abstract
The reaction of [(C5Me5)Ru(OMe)]2(2) with CF3SO3H in the presence of cyclic alkenes (cyclohexene or 4-methylcyclohexene) affords the π-arena derivatives [(C5Me5)Ru(η6-C6H6)]CF3SO3(4) and [(C5Me5)Ru(η6-C5H5Me)](CF3SO3)(5) in 40–60% isolated yield (100% spectroscopic yield) while the same reaction with tetramethylcyclopentenone affords the novel triple-decker title complex (3) in 90% yield; a mechanism involving unstable dihydrogen intermediate complexes is proposed.
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