AbstractDegradation of the N‐oxides and quaternary salts of the cis and trans forms of 1,6‐bis‐dimethylamino‐cyclodeca‐3,8‐dienes (4 b) and (4 c), respectively, afforded mixtures of hydrocarbons C10H12 separable by gas chromatography after hydro‐genation. In both cases a mixture of decalins, n‐butykyclohexane,n‐butylbenzene, cyclodecane and an unidentified tricyclic hydrocarbon C10H16 were obtained. However, COPE elimination yielded mainly trans‐decalin (66%), HOFMANN elimination mainly the cis isomer (58‐74%).