“Head-to-head” dimerization and dehydrodimerization of vinyl ketones catalyzed by modified rhodium (I) complexes

…, AV Ignatenko, MG Vinogradov, GI Nikishin

Index: Kovalev, I. P.; Kolmogorov, Yu. N.; Strelenko, Yu. A.; Ignatenko, A. V.; Vinogradov, M. G.; Nikishin, G. I. Journal of Organometallic Chemistry, 1991 , vol. 420, # 1 p. 125 - 133

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Citation Number: 7

Abstract

Abstract The dimerization of vinyl ketones RC (O) CH CH 2, I (R= Me, t Bu, Ph, p-MeC 6 H 4, cyclopropyl, 2-(5-methylfuryl)) at 80 C in the presence of the catalytic system [RhCl (C 2 H 4) 2] 2 MCl 2 leads preferably to either α, β-unsaturated 1, 6-diketones RC (O) CH CHCH 2 CH 2 C (O) R, II when M= Ge or to diene 1, 6-diketones RC (O) CH CHCH CHC (O) R, III when M= Sn. The yields of II and III are 20–85% to converted I, the conversion of vinyl ...