cis-isomer. At 25°, this primary ptotochemical product undergoes a thermal 1,7-sigmatropic hydrogen migration to yield the trans,cis,cis, isomer. This latter triene upon sensitized irradiation yields cis-bicyclo[5.4.0]undeca-8,10-diene and trans-bicyclo[7.2.0]undeca-2,10-diene. The ratio of these latter two products changes with the temperature of the sensitized reaction. The possible mechanisims of these
研究了10和11元环1,3,5-
三烯的三联体的光
化学性质。在-70°下,顺,反,顺-环癸-1,3,5-
三烯仅向顺,顺,顺-异构体移动。在25°下,后一种化合物通过热不稳定的反式,顺式,反式-环癸-1,3,5-
三烯转化为顺式-双环[4.4.0] deca-2,4-二烯。在-70°,顺式,反式,顺式-环烯-1,3,5-
三烯转化为顺式,顺式,顺式-异构体。在25°时,这种主要的光
化学产物经历热的1,7-σ氢迁移,从而生成反式,顺式,顺式异构体。后者的
三烯在敏化辐射下产生顺式-双环[5.4.0] undeca-8,10-二烯和反式-双环[7.2.0] undeca-2,10-二烯。后两种产物的比例随敏化反应的温度而变化。讨论了这些转换的可能机制。