Formation of dialkoxyphosphinylalkylidene derivatives of galactitol by transacetalation reactions
作者:Shaul Yanai、Mordehai halmann、David Vofsi
DOI:10.1016/s0008-6215(00)84537-1
日期:1980.8
Abstract Transacetalation reactions of galactitol with 2,2-dialkoxyethylphosphonates gave the expected 1,3:4,6-diacetal as the minor product, but the major product was 1,3:4,5 derivative. With a 3,3-diethoxypropylphosphonate, the 1,3:4,6-diacetal became the major product. The influence of the dialkoxyphosphinyl substituent on the acetal linkage is shown to be stereoelectronic.
摘要半乳糖醇与2,2-二烷氧基乙基膦酸酯的缩醛反应可生成预期的1,3:4,6-二缩醛作为次要产物,但主要产物为1,3:4,5衍生物。与3,3-二乙氧基丙基膦酸酯一起,1,3:4,6-二缩醛成为主要产品。显示二烷氧基次膦基取代基对缩醛键的影响是立体电子学。