1-Formyl-r-2,c-6-bis(4-methoxyphenyl)-t-3-methylpiperidin-4-one

The asymmetric unit of the title compound, C21H23NO4, contains two crystallographically independent molecules A and B. In both molecules, the piperidine-4-one rings adopt a distorted twist-boat conformation. The formyl group at position 1, the methoxyphenyl ring at position 2 and the methyl group at position 3 are attached equatorially. The methoxy phenyl ring at position 6 has an axial orientation. The dihedral angle between the two benzene rings is 55.27 (8)° in molecule A, and 55.29 (8)° in molecule B. In the crystal, the molecules are linked by weak C—H...O intermolecular hydrogen-bond interactions. In addition, weak C—H...π intermolecular interactions involving the benzene rings at positions 6 and 2 of molecule B are also found in the crystal structure.

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