Reactions of the 1-hydroxy-1,4-dimethylcyclohexadienyl cation, an intermediate in the solvolysis of 1,4-dimethyl-4-nitrocyclohexa-2,5-dien-1-ol
作者:Alfred Fischer、George N. Henderson、Trevor A. Smyth
DOI:10.1139/v86-184
日期:1986.6.1
Solvolysis of 1,4-dimethyl-4-nitrocyclohexa-2,5-dien-1-ol in mixed aqueous organic solvents gives the diastereomers of 1,4-dimethylcyclohexa-2,5-diene-1,4-diol, 1,4-dimethylcyclohexa-3,5-diene-1,2-diol, 2-nitro-p-xylene, 2,4-dimethylphenol (all derived from the title cation, itself formed by ionization of the nitro group as nitrite), and 2,5-dimethylphenol. In aqueous methanol the diastereomers of
1,4-二甲基-4-硝基环己-2,5-二烯-1-醇在混合水性有机溶剂中的溶剂分解得到1,4-二甲基环六-2,5-二烯-1,4-二醇的非对映异构体,1, 4-二甲基环己-3,5-二烯-1,2-二醇、2-硝基-对二甲苯、2,4-二甲基苯酚(均来自标题阳离子,本身通过硝基作为亚硝酸盐的电离形成),和2,5-二甲基苯酚。在含水甲醇中,还获得了 4-甲氧基-1,4-二甲基环己-2,5-二烯醇的非对映异构体。2,5-二甲基苯酚的显着产率仅在二烯二醇(或甲氧基二烯醇)的酸催化进一步反应中获得,并且涉及中间体 1,4-二甲基环己-3,5-二烯-1,2-二醇的形成。在不添加碱的情况下,溶剂分解中释放的酸催化该反应并导致二烯的芳构化。