作者:Erika Rommel、Jakob Wirz
DOI:10.1002/hlca.19770600106
日期:1977.1.26
Irradiation of pale yellow 5-methyl-1, 4-naphthoquinone (1, Scheme 1) yields the blue photoenol 4-hydroxy-5-methylidene-1(5H)-naphthalenone (2) which is stable at 77 K. At room temperature the enol retautomerizes to starting material, the reaction rate being strongly dependent on the hydrogen-bond-acceptor basicity of the solvent. The enol is trapped in the presence of acid by protonation at the remaining
辐照淡黄色的5-甲基-1,4-萘醌(1,方案1)产生蓝色的光烯醇4-羟基-5-亚甲基-1(5 H)-萘酮(2),在77 K下稳定。在室温下在此温度下,烯醇再异构化为起始原料,反应速率在很大程度上取决于溶剂的氢键受体碱度。烯醇在酸的存在下通过质子化在剩余的羰基氧原子上被捕集,随后发生了外环亚甲基的亲电反应。