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Benzylbenzoin benzyl ethers as new photoinitiators

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The title benzoins are prepared and their photochemistry has been investigated. Product analysis studies indicate that the benzoin undergoes Norrish Type I photocleavage to generate benzoyl and benzyloxybenzyl radical, followed by thermal fragmentation to produce deoxybenzoin thereby generating benzyl radical. All three transient species are actually detected and characterized by laser flash photolysis of the benzoin in solution at room temperature. The efficiency of the benzoins as photoinitiator has been also investigated. Effects of ring substituents and polycyclic aromatic rings on the photoreactivity have been revealed.

Affiliations: 1: Chemistry Department for Materials, Faculty of Engineering, Mie University, Tsu, Mie 514-8507, Japan; 2: Technical Center, Nippon Paint Co., Ltd., Neyagawa, Osaka 572-8501, Japan; 3: Laboratoire de Photochimie Générale, Unité de Recherche Associée au CNRS, Ecole Nationale Supérieure de Chimie de Mulhouse


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