Journal of Organometallic Chemistry p. 419 - 432 (1989)
Update date:2022-08-17
Topics:
Castiglioni, Mario
Giordano, Roberto
Sappa, Enrico
The cluster Ru3(CO)12-n(PPh2H)n (n=2,3), HRu3(CO)10(μ-PPh2), HRu3(CO)9(μ-PPh2) and HRu3(CO)7(μ-PPh2)3 show considerable activity in the selective hydrogenation of diphenylacetylene to stilbenes; the phosphine-substituted derivatives are also very efficient in the isomerization of cis-stilbene to trans-stilbene.The latter product is often found as a precipitate in the vials after the hydrogenation or isomerization experiments.Different cis/trans-stilbene ratios in the hydrogenation solutions have been found for the phosphine-substituted and the phosphido-bridged clusters; this points to different reaction patterns and/or intermediates.A comparison of the behaviour of C2Ph2, C2Et2 and HC2But under the same conditions and in the presence of the same phosphido-bridged cluster has been made; the nature of the alkyne has an important influence on the hydrogenation rate and the formation of reaction intermediates.
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