Irradiation of cis-1,5,6-triphenylcyclohexa-1,3-diene gave exo,exo-3,4,6-triphenylbicyclo[3,1,0]hex-2-ene whereas irradiation of the corresponding trans-cyclohexadiene gave the 4-exo, 6-endo-substituted bicyclohexene; secondary steric factors appear to control the direction of the conrotatory ring opening.
A. Padwa, L. Brodsky and S. C. Clough, J. Chem. Soc. D, 1971, 417 DOI: 10.1039/C29710000417
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