Conformational behaviour of medium-sized rings. Part III. Heterocyclic analogues of 12,13 – dihydro – 11H – dibenzo[a,e]cyclononene, 6,11,12,13 – tetrahydro – 5H – dibenzo[a,e]cyclononene, and 5,6,7,12,13,14 – hexahydrodibenzo – [a,f]cyclodecene
Conformational behaviour of medium-sized rings. Part III. Heterocyclic analogues of 12,13 – dihydro – 11H – dibenzo[a,e]cyclononene, 6,11,12,13 – tetrahydro – 5H – dibenzo[a,e]cyclononene, and 5,6,7,12,13,14 – hexahydrodibenzo – [a,f]cyclodecene, (W. D. Ollis, J. F. Stoddart), J. Chem. Soc., Perkin Trans. 1 1976, 9, 926-937.