The mixture of dienes formed upon direct irradiation of 3,3-dimethyl-1,2-diarylcyclopropenes [1-phenyl-2-p-methoxyphenyl (Ib) and 1-phenyl-2-p-cyano-phenyl (Ic)] indicates regioselective cleavage of the cyclopropene bond bearing the electron donating aryl ring.
R. M. Morchat and D. R. Arnold, J. Chem. Soc., Chem. Commun., 1978, 743 DOI: 10.1039/C39780000743
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