Process for preparing dihalovinylcyclopropanecarboxylates
申请人:Sagami Chemical Research Center
公开号:US04214097A1
公开(公告)日:1980-07-22
Novel syntheses of dihalovinylcyclopropanecarboxylates, including potent insecticides, are described. The processes begin with the reaction between an alkenol and an orthoester to produce a .gamma.-unsaturated carboxylate, followed by the catalyzed addition of a carbon tetrahalide to the double bond and dehydrohalogenation to produce a cyclopropane derivative.
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