Differentiation of the reactivities of carbon-carbon multiple bonds in one molecule. Highly chemo- and stereo-selective hydrohalogenation of allyl or propargyl propiolates
摘要:
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.
HYDROCHLORINATION OF 2,3-ACETYLENIC ACIDS WITH THIONYL CHLORIDE IN DIMETHYLFORMAMIDE
作者:Neudo A. Urdaneta、Julio C. Herrera、José Salazar、Simón E. López
DOI:10.1081/scc-120012990
日期:2002.1
ABSTRACT The reaction of 2,3-acetylenic acids (1a–d) with thionylchloride in DMF under mild conditions gave E,Z-3-chloro-2-alkenoic acids (2a–d) or esters (3a–d) depending on treating the reaction mixture with either water or alcohols.
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.
MA, SHENGMING;LU, XIYAN, TETRAHEDRON LETT., 31,(1990) N2, C. 7653-7656