The nuclear magnetic resonance spectra of a series of substituted benzaln~alo~lonitriles were examined in various solvents. The chemical shifts for the olefinic protons are susceptible t o large solvent effects which are interpreted as arising from association of a solvent molecule with the olefinic proton (acetone) or a site in its vicinity (benzene). With acetone this leads to a downfield shift from values observed in chloroform.
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