MOLECULAR CLUSTERS IN HOMOGENEOUS CATALYSIS - KINETIC AND CHEMICAL EVIDENCE FOR THE PARTICIPATION OF TRIRUTHENIUM CLUSTER COMPLEXES IN A CLUSTER-PROMOTED CATALYTIC-HYDROGENATION OF DIPHENYLACETYLENE

被引：24

作者：

CABEZA, JA

FERNANDEZCOLINAS, JM

LLAMAZARES, A

RIERA, V

机构：

[1] Departamento de Química Organometálica, Universidad de Oviedo

来源：

ORGANOMETALLICS | 1993年 / 12卷 / 10期

关键词：

D O I：

10.1021/om00034a057

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The cluster complex [Ru3(mu-H)(mu3-ampy)(CO)8(PPh3)] (1) (Hampy = 2-amino-6-methylpyridine) promotes the selective homogeneous hydrogenation of diphenylacetylene to stilbene (353 K, P(H2) < 1 atm). A kinetic study of the catalytic reaction, which is first order in cluster concentration, as well as the isolation and characterization of the compounds [Ru3(mu3-ampy)(mu,eta1:eta2-Ph2C2H)(CO)7(PPh3)] (2) and [Ru3(mu-H)2(mu3-ampy)(mu,eta1:eta2-Ph2C2H)(CO)6(PPh3)] (3), which are the products of the sequential reactions of 1 with diphenylacetylene and hydrogen, indicate that the catalytic species are trinuclear and that the rate determining step in the catalytic cycle is an isomerization reaction in complex 3 which favors the reductive coupling of the hydride and alkenyl ligands to give cis-stilbene. Complex 1 does not react with hydrogen under the conditions used in the catalytic runs.

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页码：4141 / 4144

页数：4

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