Irradiation of the dihydrocyclobutanaphthalene adduct (I), obtained by photocycloaddition of 2-naphthonitrile to alkyl vinyl ethers, affords the isomeric dihydro-cyclobutanaphthalene (II) and the dihydrobenzocyclooctene (III); pyrolysis of (II) gives (III), whereas irradiation of (III) gives the dihydrocyclobutanaphthalene (IV) quantitatively.
K. Mizuno, C. Pac and H. Sakurai, J. Chem. Soc., Chem. Commun., 1973, 219 DOI: 10.1039/C39730000219
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