Tautomerism troubles: proton transfer modifies the stereochemical assignments in diastereoisomeric structures of spiro­cyclic 5-methyl-2H-imidazol-4-amine dimers

During the racemization of a novel pharmaceutical spiro­cyclic imidazole–amine compound, namely, 6′-bromo-N-(6′-bromo-4-meth­oxy-4′′-methyl-3′H-di­spiro[cyclo­hexane-1,2′-indene-1′,2′′-imidazol]-5′′-yl)-4-meth­oxy-4′′-methyl-3′H-di­spiro­[cyclo­hexane-1,2′-indene-1′,2′′-imidazol]-5′′-imine, C(36)H(41)Br(2)N(5)O(2), two impurities were isolated. These impurities were clearly dimers from mass spectroscopic analysis, however single-crystal diffraction characterization was required for the assignment of stereochemistry. The single-crystal diffraction results revealed subtly different structures to those proposed, due to an unexpected proton transfer. The dimers contain four stereocentres, but two of primary inter­est, and are centrosymmetric, so after careful structure refinement and close inspection it was possible to unambiguously assign the stereochemistry of both the homochiral [(S),(S)- and (R),(R)-] and the heterochiral [(S),(R)- and (R),(S)-] compounds.