The intramolecular meta photocycloaddition of bichromophores 1-3 is examined and the observed regiochemistry of cycloaddition is rationalised in terms of stabilisation of zwitterionic intermediates and the steric constraints introduced into the 5-phenylpent-1-ene skeleton by the benzylic tether.
检查了双色团1-3的分子内间光环加成反应,并根据两性离子中间体的稳定性和苄基系链引入5-苯基戊-1-烯骨架中的空间限制,合理化了所观察到的环加成反应的区域
化学。