The photochemical reaction behavior of 2-halobenzyl phenyl ethers were studied, in order to investigate photoreactivity and photoreaction mechanism of those compounds. The photochemical reactions of 2-halobenzyl phenyl ethers were studied in several c...
The photochemical reaction behavior of 2-halobenzyl phenyl ethers were studied, in order to investigate photoreactivity and photoreaction mechanism of those compounds. The photochemical reactions of 2-halobenzyl phenyl ethers were studied in several conditions. Photo-Fries type products and phenol were obtained as main products, and small amounts of photocyclized and photoreduced products were obtained. In the presence of oxygen, the formation of phenol was not affected much, the formation of photo-Fries type products was changed a little, but the formations of photocyclized and photoreduced products were affected effectively. Photocylization and photoreduction were inhibited by piperylene. Therefore singlet state is involved in the formation of phenol, and triplet state may be involved in photocyclization and photoreduction. All products were affected by nitrous oxide except phenol, this result implies that radical or radical-anion is involved in those photoreaction.