The conformations and relative configurations of four epoxides of α-amido cyclohexenes have been determined by the combination of molecular modeling and NMR decoupling technique.cis-Epoxides were deduced from the vicinal coupling constants calculated from the torsional angles H(1)-C(1)-C(2)-H(2) in modeling models by means of Karplus equation and observed by decoupling technique.The crystal structure of cis-4-nitro-N-(7-oxabicyclo[4.1.0]hept2-yl)benzamide further confirms this assignment.