Intramolecular hydrogen bonding and conformation of a dipyrrolic derivative

The conformation of 1-phenyl-1-(1,2-dimethyl-5-pyrrolyl)-2-(2-methyl-5-benzoyl-1-pyrroly)ethanol, with characteristics of a molecular propeller, is stabilized by intramolecular hydrogen bonding as detected by 1H NMR, NOE difference experiments, 2D NMR, COSY, 13C NMR, HETCOR, HMBC and 1H NMR variable-temperature experiments.