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organic compounds
The crystal structures of 2,2′-[2,2-dimethyl-1,3-propanediylbis(nitrilopropylidyne)]diphenol, C23H30N2O2, and 2,2′-{2,2-dimethyl-1,3-propanediylbis[nitrilo(phenyl)methylidyne]}diphenol, C31H30N2O2, have been determined. The NO contact distances in both molecules are indicative of intramolecular hydrogen bonding. The molecular conformations are compared and shown to be very similar.