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The title salt, C 24 H 24 N + ·BF 4   − , 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.

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