NMR Spectral Studies of some Six - Membered and Seven - Membered Saturated Hetero Cyclic Compounds and Preparation of T[3] - Ethyl - R[2], C[7] - Diphenyl Homopiperazin - 5 - One

Abstract

t[3]-Ethyl -r[2],c[7]- diphenyl homopiperazin-5-one was prepared using Schmidt reaction Thereafter, by taking an optimum solution of the compound in a suitable solvent, NMR measurements were taken. Some six and seven membered saturated hetero cyclic compounds were prepared. 1H NMR spectra were recorded in DMSO-d6. The chemical shifts were compared with those in CDCl3. The COSY, NOESY and 13C - 1H correlation spectra had been recorded to assign the signals unambiguously. Coupling constants were calculated using DAERM method and also using the equations of Altona and Karplus for different torsional angles from 0 to 1800. The coupling constants, calculated by Altona's equation were less than those obtained by Karplus equation for some compounds for a particular range of torsional angles, and greater for other range of torsional angles; hence both Karplus's and Altona's equations can be applied to these compounds satisfactorily.