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.
R. C. Cookson, S. M. D. B. Costa and J. Hudec, J. Chem. Soc. D, 1969, 1272 DOI: 10.1039/C29690001272
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