A novel regio- and stereospecific hydrohalogenation reaction of 2-propynoic acid and its derivatives
作者:Shengming Ma、Xiyan Lu、Zhigang Li
DOI:10.1021/jo00028a055
日期:1992.1
2-Propynoic acid and its derivatives are hydrohalogenated regio- and stereospecifically by reaction with lithium halides in acetic acid, or preferably with 1 equiv of acetic acid in refluxing CH3CN, to afford the thermodynamically unfavorable (Z)-3-halopropenoic acids and their derivatives as sole products. A rationale for the regio- and stereospecificity is briefly discussed.
Differentiation of the reactivities of carbon-carbon multiple bonds in one molecule. Highly chemo- and stereo-selective hydrohalogenation of allyl or propargyl propiolates
作者:Shengming Ma、Xiyan Lu
DOI:10.1016/s0040-4039(00)97323-4
日期:1990.1
The reaction of allyl or propargyl propiolates with lithium halides in acetic acid afforded allyl or propargyl (Z)-3-halopropenoates highly chemo- and stereo-selectively by differentiation of reactivities of carbon-carbon multiple bonds in the same molecule.