- Organolanthanide catalyzed hydrogenation and hydrosilylation of substituted methylenecycloalkanes
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This communication presents a study of the scope of the catalytic hydrogenation and hydrosilylation of chiral exomethylene-substituted cyclopentanes and cyclohexanes utilizing the organolanthanide precatalysts Cp2* LnCH(SiMe3)2 (Cp* = C5Me5; Ln = Sm, Yb). Both reaction types are sterically driven and lead to the cis-diastereomer as the major product. Additionally, the hydrosilylation is regiospecific, the silane being placed exclusively at the terminal position of the double bond.
- Molander, Gary A.,Winterfeld, Joern
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p. 275 - 279
(2007/10/03)
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- CATALYTIC ACTIVITY OF Pt/AlPO4 AND RELATED SYSTEMS. II. GAS PHASE HYDROGENATION OF XYLENES
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In the present paper data are reported on the gas-phase hydrogenation of o-, m-, and p-xylene and o-, m-, p-ethylmethylbenzene using a pulse reactor.New systems obtained by supporting Pt on AlPO4-Al2O3 (75/25), pure AlPO4 and SiO4-AlPO4 (80/20) have been used as catalysts.The effect of the reduction temperature of the catalysts and the hydrogen pressure on the selectivity to cis- and trans-dimethylcyclohexanes and ethylmethylcyclohexanes has been investigated.The result obtained are interpreted by assuming a Horiuti-Polanyi mechanism, with suprafacial addition of hydrogen.
- Aramendia, M. A.,Borau, V.,Jimenez, C.,Marinas, J. M.
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p. 743 - 750
(2007/10/02)
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