Hydrogenative ring-opening reactions of alkyl-substituted cyclopropanes over Pt/SiO2 catalyst

Pálinkó, István and Notheisz, Ferenc and Kiss T., János and Bartók, Mihály (1992) Hydrogenative ring-opening reactions of alkyl-substituted cyclopropanes over Pt/SiO2 catalyst. Journal of Molecular Catalysis, 77 (3). pp. 313-319. ISSN 0304-5102 (print); 1873-3131 (online)

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Abstract

The hydrogenative ring-opening reactions of five alkyl-substituted cyclopropanes [ethyl-(ECP), cis-1,2-dimethyl- (cDMCP) and trans-1,2-dimethyl- (tDMCP), 1,1-dimethyl-(1,1DMCP) and 1,1,2,2,-tetramethyl- (TMCP) cyclopropane] over Pt/SiO2 catalyst were studied. The shapes of the curves depicting product formation rate vs. H2 pressure suggest that C-C as well as C-H bond rupture occurs upon adsorption. Based on stereochemical considerations and on comparisons of product formation at the maximum rates, it is proposed that cDMCP forms a flat-lying complex over the surface of the catalyst and tDMCP, 1,1DMCP and TMCP react through edge-on surface intermediates. IR measurements concerning the reaction of ECP support the proposed dissociative adsorption.

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