Abstract
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. During the transformation, the exo-alkylidene xanthenes acted as an effective photosensitizer as well as a substrate of singlet oxygen.
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