Photo-Aryl Coupling and Related Reactions. II. The Formation of Triphenylenes from Halogeno-<i>o</i>-terphenyls
作者:Takeo Sato、Shigeru Shimada、Kazuo Hata
DOI:10.1246/bcsj.42.766
日期:1969.3
Electronic effects on the photochemical conversion of o-terphenyl to triphenylene were examined by comparing the ultraviolet irraiation reaction, carried out in a benzene solution using iodine as an oxidant, of three classes of o-terphenyl derivatives, 4- (3) and 4′-substituted (4) and 4,4″-disubstituted derivatives (5). While a strong electron-withdrawing group such as nitro group, hindered the cyclization
通过比较在使用碘作为氧化剂的苯溶液中进行的三类邻三联苯衍生物 4- (3) 和 4' 的紫外线照射反应,研究了对邻三联苯光化学转化的电子效应-取代的 (4) 和 4,4" - 二取代的衍生物 (5)。虽然硝基等强吸电子基团阻碍了环化反应的发生,但甲氧基、氟、氯和溴化合物提供了相应的苯并苯衍生物。然而,对于溴和碘化合物,由于碳 - 卤素键的光化学裂解导致产物的复杂混合物,这导致苯基化产物的形成,因此苯基三亚苯基与还原产物一起形成。此外,对于碘化合物,发现不需要氧化剂来进行环化脱氢反应,因为在光解过程中会释放出碘。形成光解产物的可能途径...