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Decisive Reaction Steps at Initial Stages of Photoinitiated Radical Polymerizations

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  • Financial support from the Austrian Science Fund FWF and the CIBA Jubiläumsstiftung is gratefully acknowledged.

Abstract

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The first addition of photoinitiator radicals formed by the photolysis of a bisacylphosphine oxide photoinitiator to an acrylate double bond proceeds reversibly (see scheme; R1=tBu, H; R2=MeOC([DOUBLE BOND]O), BuOC([DOUBLE BOND]O)). Moreover, hydrogen transfer between substituted benzoyl radicals and the growing radical chain explains the formation of aldehydes in such a transformation.

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