Liquid-phase photolysis. Part X. Formation of spiro-oxetans by photoaddition of olefins to p-benzoquinone
作者:D. Bryce-Smith、A. Gilbert、M. G. Johnson
DOI:10.1039/j39670000383
日期:——
Irradiation of solutions of p-benzoquinone and olefins in benzene gives spiro-oxetans by 1,2-addition of a carbonyl group of the quinone. The following olefins react in this way: cyclohexene, cyclo-octene, cyclo-octa-1,5-diene, cyclo-octatetraene, bicycloheptadiene, oct-1-ene, and oct-2-ene. The adducts readily undergo acid-catalysed rearrangement to hydroxycoumarans, whilst catalytic hydrogenation
的解决方案的照射p苯醌和烯烃通过1,2-加成醌的羰基的给螺oxetans。以下烯烃以这种方式反应:环己烯,环辛烯,-1,5-环辛二烯,环辛酸酯,双环庚二烯,辛-1-烯和辛-2-烯。加合物容易被酸催化重排为羟基香豆素,而催化氢化反应生成对-(2-羟烷基)苯酚,并且在热解中可能通过羟基香豆素重新形成原料。它们可以充当亲热的亲二烯体,但是没有表现出发生第二种烯烃光加成的趋势。