The photoisomerisation of 1,2-dihydronaphthalene

Abstract
Separate deuterium labelling of the olefinic and of a pair of methylene hydrogen atoms in 1,2-dihydronaphthalene shows that its photochemical rearrangement to benzobicyclo[3,1,0]hexene proceeds by opening and reclosure of the cyclohexadiene ring, rather than by hydrogen migration.

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