Restricted C–C bond rotation in a solid measured by solid state NMR spectroscopy
Abstract
1,1-Dibenzyl-2,2-dimethylpropan-1-ol 1 shows a coalescence phenomenon in its 13C solid state CP MAS NMR spectrum consistent with slowing of rotation of the tert-butyl group about the C(1)–C(2) bond with an activation energy of 13.1 kcal mol–1(1 cal = 4.184 J), 4 kcal mol–1 higher than in solution.