Photochemical Reactions of Contact Charge-Transfer Pairs of 1-Arylcyclohexenes and Oxygen
作者:Masanobu Kojima、Hirochika Sakuragi、Katsumi Tokumaru
DOI:10.1246/bcsj.60.3331
日期:1987.9
Photoexcitation of contact charge-transfer (CCT) pairs of 1-arylcyclohexenes 1 (aryl: phenyl, 4-methylphenyl, and 4-methoxyphenyl) and oxygen in acetonitrile and benzene gave 1,2-epoxy-1-arylcyclohexanes 2 as major products together with 2-aryl-2-cyclohexen-1-ols and acetophenones 4. Similar irradiation of the CCT pairs in methanol/acetonitrile afforded mainly 2-aryl-2-methoxycyclohexanols instead of 2 and small amounts of 1-aryl-1-methoxycyclohexanes, 2-aryl-2-cyclohexen-1-ones, and 4. The formation of these products can be explained by photoinduced electron transfer in the excited CCT pairs generating radical cations of 1 and superoxide anions.
在乙腈和苯中对 1-芳基环己烯 1(芳基:苯基、4-甲基苯基和 4-甲氧基苯基)和氧的接触电荷转移(CCT)对进行光激发,得到的主要产物是 1,2-环氧-1-芳基环己烷 2 以及 2-芳基-2-环己烯-1-醇和苯乙酮 4。在甲醇/乙腈中对 CCT 对进行类似的辐照,得到的主要是 2-芳基-2-甲氧基环己醇而不是 2,以及少量的 1-芳基-1-甲氧基环己烷、2-芳基-2-环己烯-1-酮和 4。这些产物的形成可以用激发的 CCT 对中产生 1 的自由基阳离子和超氧阴离子的光诱导电子转移来解释。