Abstract
NMR 13C relaxation times have been measured for testosterone in [2H6]DMSO at various temperatures. The data were processed by a computer-assisted method of analysis based on several molecular reorientational motion models. As a result of this study, activation energies have been determined for the molecular motion. From an analysis of the temperature-dependent 13C T1 of quaternary carbon atoms, it is seen that the spin-rotation and chemical-shift-anisotropy mechanisms contribute significantly to the quaternary sp2 carbons whereas only the spin-rotation mechanism contributes to the quaternary sp3 carbons. The experimental relaxation times differ appreciably for the two methyl groups, indicating a difference in the barriers to internal rotation.
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