Regioselective dehydration of axial and equatorial tertiary alcohols with α-methyl group in the cyclohexane ring by Swern’s reagent
作者:P. F. Vlad、N. D. Ungur、A. N. Aricu、I. Yu. Andreeva
DOI:10.1007/bf02495210
日期:1997.4
oxalyl chloride with DMSO) was shown to dehydrate tertiary alcohols containing an α-methyl group in the cyclohexane ring. Dehydration of equatorial alcohols affords mixtures of isomeric compounds where isomers with an exocyclic double bond dominate, whereas isomers with an endocyclic double bond prevail in the products of dehydration of axial tertiary alcohols. Thus, Swern’s reagent can serve as a chemical
Swern's 试剂(草酰氯与 DMSO 的复合物)被证明可以使环己烷环中含有 α-甲基的叔醇脱水。赤道醇的脱水提供异构化合物的混合物,其中具有环外双键的异构体占主导地位,而具有环内双键的异构体在轴向叔醇的脱水产物中占优势。因此,Swern's 试剂可以作为化学测试来确定在环己烷环中含有 α-甲基的叔醇的构型。这些醇用 Swern 试剂脱水的产物的组成类似于它们在吡啶中用 POCl3 脱水得到的产物。