Ni-catalyzed ring-opening reactions of alkyl-substituted cyclopropanes; role of unreduced Ni species

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)

PDF 105079.pdf Restricted to Registered users only Download (413kB)

Abstract

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.

Actions (login required)

Edit Item