A dynamic n.m.r. investigation of a derivative of 1,8-di-t-butylnaphthalene shows that it has a barrier to back-and-forward flipping of t-butyl groups of 22.5 kcal mol–1, in good agreement with molecular mechanics calculations.
J. E. Anderson and R. W. Franck, J. Chem. Soc., Perkin Trans. 2, 1984, 1581 DOI: 10.1039/P29840001581
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