Pálinkó, István and Notheisz, Ferenc and Bartók, Mihály (1991) Ni-catalyzed ring-opening reactions of alkyl-substituted cyclopropanes; role of unreduced Ni species. Journal of Molecular Catalysis, 68 (2). pp. 237-241. ISSN 0304-5102 (print); 1873-3131 (online)
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The reactions of five alkyl-substituted cyclopropanes (ethyl-, cis-1,2-dimethyl-, trans-1,2-dimethyl-, 1,1-dimethyl- and 1,1,2,2-tetramethylcyclopropane) were studied in a hydrogen atmosphere over completely and partially reduced Ni/SiO2 catalyst. The main reaction, hydrogenative ring-opening, is accompanied by hydrogenolysis over the completely reduced catalyst. The hydrogen pressure dependence of this reaction and stereochemical features (i.e. the geometry of the molecules, and differences in the rates of transformations of stereoisomers) were used to acquire mechanistic information. Over the partially reduced Ni/SiO2, isomerization to olefins also occurs. The extent of this pathway increases with decreasing reduction temperature.
|Subjects:||Q Science / természettudomány > QD Chemistry / kémia|
|Depositing User:||Erika Bilicsi|
|Date Deposited:||19 Sep 2012 13:13|
|Last Modified:||25 Sep 2012 07:51|
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