Die Dienol-Benzol-Umlagerung von Propargylcyclohexadienolen: aromatische [1,2]-, [3,3]- und [3,4]-sigmatropische Umlagerungen
作者:H. Heimgartner、J. Zsindely、H.-J. Hansen、H. Schmid
DOI:10.1002/hlca.19720550408
日期:1972.4.20
The acid catalysed dienol-benzene rearrangement of methyl substituted o- and p-propargylcyclohexadienols (18–22, 34 and 35) was investigated. In the first step water is eliminated to yield the corresponding methyl propargyl benzonium ions (cf. scheme 6, a), which undergo [1s, 2s] sigmatropic rearrangements to give propargylbenzenes (28, 29, 30, 38) and [3s, 4s] sigmatropic rearrangements to give allenylbenzenes
的甲基substituiertem的酸催化二烯醇-苯重排ø -和p -propargylcyclohexadienols(18-22,34和35,其考察)。在第一步骤中的水被消除,得到相应的甲基炔丙基benzonium离子(参见方案6,一个),其经历[1级小号,2个小号]σ迁移重排,得到propargylbenzenes(28,29,30,38)和[3小号,4小号]σ迁移重排,得到allenylbenzenes(24-27,40)(参见方案2,3,5,6)。[3s,3 s ]σ重排仅在很小的范围内发生。在2-炔丙基-2,4,6-三甲基环己-3,5-二烯-1-醇(18)的重排中,观察到[1 s,2 s ]σ甲基位移(4%)。