✍ Scribed by Frank G. Riddell; Martin Rogerson
No coin nor oath required. For personal study only.
)-1,3-dioxane displays a double tert-butyl coalescence at low temperatures in its 13C CP/MAS NMR spectrum associated with slowing down of the rotation of both tert-butyl groups. The overlap of the resonances precluded the measurement of rates of rotation from lineshape analyses. However, 13C
measurements above coalescence allowed rates of rotation and activation parameters for the rotations of both T 1o groups to be derived. The C-tert-butyl group has DHt = 26.3 » 3.6 kJ mol-1 and DSt Ô 13 » 14 J K-1 mol-1. The S-tert-butyl group has DHt = 31.8 » 2.2 kJ mol-1 and DSt Ô 9 J K-1 mol-1.
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