SCHEDULED MAINTENANCE
The structures of the title compounds have been determined by X-ray crystallography, and ring torsional angles are given for all three compounds; the conformation of the seven-membered ring is a slightly ‘twisted chair’ and that of the eight-membered ring a ‘boat chair,’ while the nine-membered ring does not possess any obvious symmetry.
T. S. Cameron and H. W. Scheeren, J. Chem. Soc., Chem. Commun., 1977, 939 DOI: 10.1039/C39770000939
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