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Crystal structure and conformational analysis of N-formyl and N-nitroso derivatives of piperidinone

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Abstract

Single crystal X-ray studies for N-formyl-2,6-diortho chlorophenyl-3,5-dimethyl piperidin-4-one (FOCDMPO) and N-nitroso-2,6-di(3′,4′,5′-trimethoxyphenyl)-3,5-dimethyl piperidin-4-one (NTMPO) are reported. Crystals of FOCDMPO and NTMPO belong to the monoclinic space groups P21/n and C2/c, respectively. FOCDMPO: a = 9.147(2), b = 14.586(3), c = 13.665(5) Å and β = 101.68(2)° NTMPO: a = 38.52(2), b = 13.727(5), c = 9.564(3) Å and β = 98.60(1)°. In both the structures, the piperidine ring adopts a boat conformation with slight distortion. In FOCDMPO, one of the phenyl and methyl groups are in axial positions while the other phenyl and methyl groups are in equatorial orientations. In NTMPO, the situation is reversed. The molecules are stabilized by weak intermolecular C—H ··· O interactions in addition to van der Waals forces.

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Kumaran, D., Ponnuswamy, M., Shanmugam, G. et al. Crystal structure and conformational analysis of N-formyl and N-nitroso derivatives of piperidinone. Journal of Chemical Crystallography 29, 769–775 (1999). https://doi.org/10.1023/A:1009587518299

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