(3R,4S)-3-Methyl-4-phenyl-2-[(R)-1-phenylethyl]-3,4-dihydroisoquinolin-2-ium tetrafluoridoborate

The title salt, C24H24N+·BF4−, is one of two possible diastereoisomers having a different configuration of the asymmetric centre in the α-phenylethyl substituent, whose absolute configuration was established to be R. The two phenyl substituents of the cation have a cofacial orientation, albeit with a long centroid–centroid separation of 4.129 (3) Å. The crystal structure exhibits numerous C—H...F contacts between counter-ions, with the tetrafluoridoborate anion surrounded by five iminium cations