Photocyclization of 1-(1-benzothien-3-yl)-2-(1-napthyl)ethylene produced the expected compound whereas the isomeric 2-naphthylethylene furnished an unusual product cyclized at the β′ position of the naphthalene nucleus.
A. Croisy, P. Jacquignon and F. Perin, J. Chem. Soc., Chem. Commun., 1975, 106 DOI: 10.1039/C39750000106
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