The 220 MHz 'H spectra of isoverbanone, nopinone and verbanone are reported. The spectra of the first two are completely assigned but that of verbanone only partially. The coupling constants obtained provide information about the conformation of these molecules. The isoverbanone molecule is almost Y shaped, but that of nopinone is between a Y shape anda half-chair conformation with the six membered ring bent away from the gem dimethyl groups. These conformations are consistent with the known steric interactions in these molecules.