Homogeneous hydrogenation of cyclohexene catalyzed by complexes of rhodium and iridium

Taqui Khan, M. M. ; Khan, Badar Taqui ; Safiaa, ; Nazeeruddin, K. (1984) Homogeneous hydrogenation of cyclohexene catalyzed by complexes of rhodium and iridium Journal of Molecular Catalysis, 26 (2). pp. 207-217. ISSN 0304-5102

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0304-5102(84)85004-X

Abstract

The synthesis and characterization of RhClHN(CH2CH2PPh2)2 and IrClHN(CH2CH2PPh2)2 and their catalytic activity in the homogeneous hydrogenation of cyclohexene over the temperature range 20-50°C and 0.4-1 atm H2 partial pressure have been investigated. The dependence of the rate of hydrogenation on factors such as the catalyst concentration, the substrate concentration, H2 pressure and the temperature is reported. A mechanism has been proposed in which the catalysts activate molecular hydrogen by forming dihydrido species of the type MClL(H)2 [M=Rh(I), Ir(I) and L=HN(CH2CH2PPh2)2] followed by transfer of hydrogen to the olefin to form the saturated product. The experimental data are in accordance with a rate expression of the form : Rate = k'K1[H2][S][C]/{1+K1[H2]}{1+K2[S]} where [H2], [S] and [C] are the concentration of H2, substrate and catalyst, respectively. The activation parameters of the reaction, ΔH and ΔS, have also been evaluated.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:58547
Deposited On:31 Aug 2011 12:15
Last Modified:31 Aug 2011 12:15

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