Abstract-The carbon-I3 n.m.r. spectra of three isomers of 4b, 5,6,7,8,8a 1,2,3,4,4a,5,6,10b-octahydro-6-phenylphenanthridines and the 2-phenylcylohexylam~nes. The configuration and the conformation of these compounds can be determined from the chemical shift values.