Kinetics and mechanisms of homogeneous catalytic reactions. Part 2. Hydrogenation of cyclohexane catalysed by [RuH(CO)-(NCMe)2(PPh3)2]BF4 |
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| Authors: | Merlin Rosales Ysaías Alvarado Nelya Gallardo Raúl Rubio |
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| Institution: | (1) Inorganic Chemistry Laboratory, Facultad de Ciencias, La Universidad del Zulia (L.U.Z.), Apdo. 526, Maracaibo, Venezuela |
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| Abstract: | Summary Kinetic and mechanistic studies of the homogeneous hydrogenation of cyclohexane were carried out using the cationic complex RuH(CO)(NCMe)2(PPh3)2]BF4 as the catalyst precursor, which was very efficient under mild reaction conditions in xylene solution. The experimental rate law was found to ber = {K
1
K
2
k
3/(MeCN]+K
1–(1+K
2)C6H10]}Ru]C6H10]H2], which became {K
2
k
3/(1 +K
2)}Ru]H2] at high cyclohexane concentrations. The activation parameters were calculated. The kinetic data are consistent with a mechanism involving the oxidative addition of hydrogen as the rate-determining step of the catalytic cycle. |
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| Keywords: | |
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