1,3,7,9-Tetraselenacyclododecane and its 5,5,11,11-tetramethyl analogue are shown by dynamic n.m.r. studies to have a [3333] quadrangular conformation in which the selenium atoms occupy only side positions, and to possess pseudorotational barriers of 6.0 and 7.6 kcal mol–1, respectively.
B. M. Pinto, B. D. Johnston, R. J. Batchelor and J. Gu, J. Chem. Soc., Chem. Commun., 1988, 1087 DOI: 10.1039/C39880001087
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