free energy change for electrontransfer between 11* and the alkynes and the calculation of charge and spin density distribution in the anion radical of 1 and the cationradical of the alkynes suggested that the cyclobutene products are formed by direct [2+2] cycloaddition of 11* with the alkyne, while the formation of the oxetene products is the result of electrontransfer interaction between 11*
研究了N-甲基-1,8-萘二甲酰亚胺1与苯基乙炔2a - 2c,环丙基乙炔2d,二苯基乙炔2e - 2f和1-苯基丙炔2g的光诱导环加成反应。在苯乙炔2a,2b和环丙基乙炔2c的情况下,在萘的C(1)C(2)键处发生与1的光反应,得到环丁烯产物。对于4-甲氧基苯基乙炔1c,与4-苯并[ a]一起获得环丁烯3c。由亚氧羰基伯产物衍生的苯二酮4c,该产物是通过将炔羰基[2 + 2]加成而形成的。与2c相似,将1与2e和2f进行光环加成反应,分别得到环丁烯7e,7f,8f和分别衍生自相应氧杂环丁烯的4-苯并[ a ]苯并二酮产品9e,9f和10f。1与2g的光反应得到7g的环丁烯和9g的苯并[ a ] Thebenidinone。致敏试验和内部重原子效应的研究表明,这些反应从ππ*的单重激发态继续进行1。估算1 1 *与炔烃之间电子转移的自由能变化,并计算1的阴离子基团和炔烃的阳离子基团中的电荷