The singlet cyclization of Z(or E)-1-biphenyl-2-yl-1-phenylpropene proceeds stereoselectively to cis(or trans)-9-phenyl-10-methyl-9,10-dihydrophenanthrene (the cis-isomer has been characterized by X-ray crystallography) while the triplet cyclization gives a [trans]/[cis] ratio of 9 : 1 whatever the starting isomer.
R. Lapouyade, R. Koussini, A. Nourmamode and C. Courseille, J. Chem. Soc., Chem. Commun., 1980, 740 DOI: 10.1039/C39800000740
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