Homogeneous hydrogenation of cyclohexene catalyzed by Ru(II) and (III) and their trichloro-stannato complexes: proton NMR and rate studies

Taqui Khan, M. M. ; Siddiqui, M. Rafiq H. (1987) Homogeneous hydrogenation of cyclohexene catalyzed by Ru(II) and (III) and their trichloro-stannato complexes: proton NMR and rate studies Journal of Molecular Catalysis, 42 (2). pp. 161-171. ISSN 0304-5102

Full text not available from this repository.

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

Related URL: http://dx.doi.org/10.1016/0304-5102(87)85022-8

Abstract

The hydrogenation of the complexes [RuCl3(DPA)] 1, [Ru(SnCl3)-Cl2(DPA)]2, [RuCl2(DPA)2]Cl 3, [Ru(SnCl3)Cl(DPA)2]Cl 4, [RuCl2(PPh3)-(DPA)] 5, [Ru(SnCl3)Cl(PPh3)(DPA)] 6, [RuCl(DMSO)2(DPA)]Cl 7 and [Ru(SnCl3)(DMSO)2(DPA)]Cl 8, where DPA=HN(CH2CH2PPh2)2 show the formation of hydrides in benzene-ethanol and 1 atm of H2 at 30°C in situ, as confirmed by 1H NMR spectra. The homogeneous hydrogenation of cyclohexene catalysed by the above complexes was studied at 30°C and 1 atm of molecular hydrogen in benzene-ethanol mixture. A mechanism for the homogeneous hydrogenation reaction is proposed where the coordination of the olefin to the hydride complex is rate determining, followed by a rapid transfer of the hydrogen to the olefin to form the alkane. The ratio of the equilibrium constants K2/K1 for the formation of olefin/hydrido complex and the rate constant k (rate-determining step) were calculated and reported. The variation of the rates for catalytic hydro-genation of cyclohexene with the nature of the catalyst is discussed.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:57851
Deposited On:30 Aug 2011 10:27
Last Modified:30 Aug 2011 10:27

Repository Staff Only: item control page