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- W2025243640 abstract "Abstract The title complexes, containing phosphido or phosphinidene bridges, catalyze the hydrogenation of alkynes and of 1,4-cyclohexadiene (1,4-CHD). The benzyne-substituted clusters Ru 3 (CO) 7 (PPh 2 ) 2 (C 6 H 4 ) ( 1 ) and Ru 4 (CO) 11 (PPh)(C 6 H 4 ) ( 2 ) show the highest hydrogenation activity yet observed for substituted metal carbonyl clusters towards alkynes; the activity is related to the nature of the alkyne substrate, C 2 Et 2 2 Ph 2 Ph 2 . The alkyne complexes Ru 3 (CO) 7 (PPh 2 ) 2 (HC 2 Ph) ( 3 ) and Ru 4 (CO) 11 (PPh)(C 2 Ph 2 ) ( 4 ), structurally closely related to 1 and 2 , have also been examined in comparable reactions; complex 3 shows very high activity, especially towards 1,4-CHD. Organometallic intermediates could not be isolated but direct and indirect evidence supporting a reaction pathway based on cluster catalysis was obtained; this will require the formation of an active site, dihydrogen activation and insertion of the substrate into M–H bonds. Possible alternative mechanisms are also discussed." @default.
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- W2025243640 date "1998-12-01" @default.
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- W2025243640 title "Homogeneous hydrogenation of alkynes and of 1,4-cyclohexadiene in the presence of the clusters Ru3(CO)7(μ-PPh2)2(C6H4), Ru4(CO)11(μ4-PPh)(C6H4), Ru3(CO)7(μ-PPh2)2(HC2Ph) and Ru4(CO)11(μ4-PPh)(C2Ph2)" @default.
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- W2025243640 doi "https://doi.org/10.1016/s0022-328x(98)00896-1" @default.
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