Benzocyclobutene derivatives bearing an oxygen substituent at position 1 undergo conrotatory thermal ring opening to yield reactive diene species in which the oxygen substituent preferentially adopts the (E)-configuration.
B. J. Arnold and P. G. Sammes, J. Chem. Soc., Chem. Commun., 1972, 1034 DOI: 10.1039/C39720001034
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