A regio- and stereo-selective route to 1,1,3- and 1,2,3-trihalogenobutadienes by dehydrohalogenation of alkyl-substituted 1,1,2,3-tetrahalogenocyclopropanes
作者:Mark S. Baird、Balvinder S. Mahli、Lee Sheppard
DOI:10.1039/p19900001881
日期:——
reaction with dichlorocarbene generated under phase-transfer conditions, or dibromocarbene generated either by phase transfer or from the thermolysis of phenyl-(tribromomethyl)mercury. 1,1,2,3-Tetrahalogenocyclopropanes are also obtained by reaction of the corresponding vicinal bromochloro- and dibromo-alkenes with dichlorocarbene under phase-transfer conditions or of the latter alkenes with phenyl(
Regio- and Stereochemistry of Bromochlorinations of Alkynes with Molecular Bromine Chloride and Dichlorobromate(1−) Ion
作者:Takeshi Negoro、Yoshitsugu Ikeda
DOI:10.1246/bcsj.59.3515
日期:1986.11
alkyl-substituted acetylenes with tetrabutylammonium dichlorobromate(1−) (1) in dichloromethane was found to be anti-stereospecific and nonregiospecific (regiospecific in the case of phenylacetylene). Whereas the addition of molecular bromine chloride (2) to phenyl-substituted acetylenes was found to give nonstereospecific and regiospecific adducts, the reaction of alkyl-substituted acetylenes gave anti-stereospecific