Jj. Matasi et al., Intramolecular coupling of conjugated enynes with cyclopropylcarbene-chromium complexes; a complex reaction pathway, INORG CHIM, 296(1), 1999, pp. 273-277
The intramolecular coupling of conjugated enynes with cyclopropylcarbene co
mplexes has been investigated. The desired products of the reaction, alpha-
alkenylcyclopentenones, were minor products of the reaction. Competing reac
tion processes included double bond reduction and allylic C-H activation. I
ntramolecular coupling of selenium-containing alkynes and cyclopropylcarben
e complexes followed by oxidation/elimination provided a more efficient rou
te to a-alkenylcyclopentenones. (C) 1999 Elsevier Science S.A. All rights r
eserved.