Carbon‐13 NMR studies in the polycyclic hydrocarbon series. A new method for the identification of carbons α to a carbonyl group. Complete assignment of the 13C NMR spectra of several cis‐decalins, cis‐decalones, cis‐hydrindanones and 13α,14α‐ and 13β,14β‐steroids | Magnetic Resonance in Chemistry | DeepDyve