3,3,5,5-Tetra-methyl-r-2,c-6-diphenyl-piperidin-4-one.
The piperidone ring of the title compound, C(21)H(25)NO, adopts a chair conformation with the two phenyl groups equatorially oriented and cis to each other. In the crystal, mol-ecules are linked by weak N-H⋯O hydrogen bonds, forming chains parallel to [100].
Department of Chemistry, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu,  India.
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Govindaraju
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Valliappan
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Sundari