Carbon-13 NMR spectra of solid bicyclo[3. 3. 1]nonan-9-one. Conformational studies in the solid state

Carbon-13 NMR spectra of solid polycrystalline bicyclo3.3.1]nonan-9-one and adamantanone have been measured at 315K. The relatively narrow ¹³C linewidths observed for these solids, together with measured spin-lattice relaxation times, indicate that both these solids are orientationally disordered. Observed ¹³C chemical shifts of solid bicyclo3.3.1]nonan-9-one indicate a twin-chair conformation for the two cyclohexanone rings.