TY - JOUR
T1 - Homogeneous hydrogenation of diphenylacetylene in the presence of Ru3(CO)9L3 (L=PPh3, PEt3). The crystal structure of Ru3(CO)10(PEt3)2
T2 - A reaction intermediate?
AU - Gervasio, Giuliana
AU - Giordano, Roberto
AU - Marabello, Domenica
AU - Sappa, Enrico
N1 - Funding Information:
Support for this work has been obtained from MURST (Italy) under the form of a cofinancing program between the Università di Torino and the Università del Piemonte Orientale (Alessandria).
PY - 1999/10/1
Y1 - 1999/10/1
N2 - The phosphine-substituted clusters Ru3(CO)9L3 (L=PPh3, 1; L=PEt3, 2) are active homogeneous catalysts for the hydrogenation of diphenylacetylene. In the catalytic reactions involving complex 2, formation of Ru3(CO)10(PEt3)2 (3) has been observed. This complex shows a hydrogenating activity greater than that of the parent complex 2. In the light of these results and of the observed effect of dihydrogen pressure and substrate/cluster ratio, reaction mechanisms are discussed. The structure of 3 has been characterized by X-ray diffraction and is compared with those of other phosphine-substituted triruthenium clusters. Compound 3 crystallizes in the monoclinic space group P21 with a=9.368(7), b=12.20(2), c=13.554(9) Å, β=102.63(8)° and Z=2. Refinement of 4975 data gave R1=0.0417 and wR2=0.1105. The two phosphorus ligands occupy equatorial positions on adjacent metal atoms so that they are trans to each other at the ends of the Ru-Ru vector. The presence of bent semi-bridging carbonyl groups makes the molecule chiral and its absolute structure was determined.
AB - The phosphine-substituted clusters Ru3(CO)9L3 (L=PPh3, 1; L=PEt3, 2) are active homogeneous catalysts for the hydrogenation of diphenylacetylene. In the catalytic reactions involving complex 2, formation of Ru3(CO)10(PEt3)2 (3) has been observed. This complex shows a hydrogenating activity greater than that of the parent complex 2. In the light of these results and of the observed effect of dihydrogen pressure and substrate/cluster ratio, reaction mechanisms are discussed. The structure of 3 has been characterized by X-ray diffraction and is compared with those of other phosphine-substituted triruthenium clusters. Compound 3 crystallizes in the monoclinic space group P21 with a=9.368(7), b=12.20(2), c=13.554(9) Å, β=102.63(8)° and Z=2. Refinement of 4975 data gave R1=0.0417 and wR2=0.1105. The two phosphorus ligands occupy equatorial positions on adjacent metal atoms so that they are trans to each other at the ends of the Ru-Ru vector. The presence of bent semi-bridging carbonyl groups makes the molecule chiral and its absolute structure was determined.
KW - Homogeneous catalysis
KW - Hydrogenation
KW - Phosphine-substituted ruthenium clusters
KW - Reaction intermediates
KW - X-ray absolute structure
UR - https://www.scopus.com/pages/publications/0002882944
U2 - 10.1016/S0022-328X(99)00349-6
DO - 10.1016/S0022-328X(99)00349-6
M3 - Article
SN - 0022-328X
VL - 588
SP - 83
EP - 91
JO - Journal of Organometallic Chemistry
JF - Journal of Organometallic Chemistry
IS - 1
ER -