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2+2 photocycloaddition
The () photocycloaddition is a cycloaddition-type reaction – it generally entails the formation of new molecules by the reaction of two unsaturated molecules via two atoms from each molecules (hence "(+ 2 )"). As a photochemical reaction, the use of some of form of light (generally denoted ''h''·ν), as opposed to a thermal process.
==Enone–alkene cycloadditions==
A specialized version of the () cycloaddition involves enone and alkene as substrates. Although the photochemical concerted () cycloaddition is allowed, the reaction between enones and alkenes is stepwise and involves discrete diradical intermediates.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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