Chemical shift nonequivalence and syn-anti-isomerization in an N-benzenesulphonylimine

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Abstract
A combination of methods employing diastereomeric transformation and n.m.r. line-shape analysis have been used to determine the activation parameters over a 100° temperature range (ΔH‡= 15·7 kcal./mole and ΔS‡=– 2 e.u.) for syn–anti-isomerization of N-(1,2,3-trimethyl-2-butenylidene)benzenesulphonamide.