exo-Alkylidene xanthenes were easily excited by irradiation with white light to generate their lowest-energy triplet state via intersystem crossing from the lowest-energy singlet state. Ground-state oxygen was then transformed by the lowest-energy triplet state of the xanthene to active singlet oxygen. The singlet oxygen reacted with the exo-alkylidene xanthene to afford the corresponding xanthone
exo-亚炔基
黄嘌呤很容易通过白光照射而激发,从而通过与最低能量单重态的系统间相交产生最低能量三重态。然后将基态氧通过x吨的最低能量三重态转化为活性单线态氧。单线态氧与外-亚烷基x吨反应,得到相应的x吨酮。在转化过程中,外亚烷基
黄嘌呤充当有效的光敏剂以及单线态氧的底物。