Abstract:General.-A brief history of conformational analysis over the past twenty-five years has appeared.' A new text2 on dynamic n.m.r. spectroscopy includes a useful chapter on conformational processes in rings. The concept, first applied to cyclopentane, of defining a unique mean plane for a monocyclic puckered ring, and relating the geometry of the puckering to this plane, has now been generalized to four-, five-, and six-membered carbocyclic and heterocyclic rings by Cremer and P~p l e .~The same authors have stu… Show more
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