Photoreactions of γ,δ-Unsaturated Chromium Carbene Complexes
作者:William H. Moser、Louis S. Hegedus
DOI:10.1021/ja9537585
日期:1996.1.1
A number of functionalized γ,δ-unsaturated chromiumcarbenecomplexes were synthesized, and their photochemistry was studied. Photolysis of carbenecomplexes 5 and 17 induced intramolecular [2 + 2] cycloaddition to afford cyclobutanones 6 and 18, respectively. If the photoreactions were not run in thoroughly degassed solvents, small amounts of lactones 7 and 19 were obtained as well. Cyclobutanones
Synthesis of cyclobutanones by the photolytic reaction of chromium carbene complexes with olefins: inter- and intramolecular reactions
作者:Bjorn C. Soderberg、Louis S. Hegedus、Miguel A. Sierra
DOI:10.1021/ja00167a038
日期:1990.5
Intramolecular coupling of conjugated enynes with cyclopropylcarbene–chromium complexes; a complex reaction pathway
作者:Julius J Matasi、Jingbo Yan、James W Herndon
DOI:10.1016/s0020-1693(99)00319-9
日期:1999.12
The intramolecular coupling of conjugated enynes with cyclopropylcarbene complexes has been investigated. The desired products of the reaction, alpha-alkenylcyclopentenones, were minor products of the reaction. Competing reaction processes included double bond reduction and allylic C-H activation. Intramolecular coupling of selenium-containing alkynes and cyclopropylcarbene complexes followed by oxidation/elimination provided a more efficient route to a-alkenylcyclopentenones. (C) 1999 Elsevier Science S.A. All rights reserved.
MONTGOMERY, JOHN;WIEBER, GARY M.;HEGEDUS, LOUIS S., J. AMER. CHEM. SOC., 112,(1990) N7, C. 6255-6263
作者:MONTGOMERY, JOHN、WIEBER, GARY M.、HEGEDUS, LOUIS S.