... Structures were assigned on the basis of their NMR spectra. G 1980 American Chemical Society Page 2. 1498 J. Org. Chem., 1/01, 45, No. 8, 1980 ... Found: C, 83.49; H, 6.01; N, 4.73. at 80.5 "C, 7.07 X at 91.6 "C, 1.79 X at 111.3 "C. J. Org. Chem., Vol. 45, No. 8, 1980 1501 ...