SCHEDULED MAINTENANCE:
N.m.r. evidence indicates a preferred exo–orientation in liquid mixtures of ethylenes and benzene when the ethylene is an acceptor relative to the benzene, and an endo-orientation when the ethylene is a donor: these orientations match the stereospecificities observed in the corresponding 1,2-photoaddition reactions.
D. Bryce-Smith, A. Gilbert and H. M. Tyrrell, J. Chem. Soc., Chem. Commun., 1974, 699 DOI: 10.1039/C39740000699
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