Abstract
The 4-phenyl-l-benzoxepins 4, 5 and 8 have been prepared from the seven-membered diketone 1 by enol-alkylation or -acylation reactions; their photoreaction yields the corresponding 1-phenyl-2a,7 b-dihydrocyclobuta[b] l-benzofurans 9, 10 and 11.

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