The molecular mobility of solid deuterated tert-butyl alcohol (TBA) has been studied over a broad temperature range (103-283 K) by means of solid-state H-2 NMR spectroscopy, including both line shape and anisotropy of spin lattice relaxation analyses. It has been found that, while the hydroxyl group of the TBA molecule is immobile on the H-2 NMR time scale (tau(C) > 10(-5) s), its butyl group is highly mobile. The mobility is represented by the rotation of the methyl [CD3] groups about their 3-fold axes (C-3 rotational axis) and the rotation of the entire butyl [(CD3)(3)-C] fragment about its 3-fold axis (C-3' rotational axis). Numerical simulations of spectra line shapes reveal that the methyl groups and the butyl fragment exhibit three-site jump rotations about their symmetry axes C-3 and C-3' in the temperature range of 103-133 K, with the activation energies and preexponential factors E-1 = 21 +/- 2 kJ/mol, k(01) = (2.6 +/- 0.5) x 10(12) s(-1) and E-2 = 16 +/- 2 kJ/mol, k(02) = (1 +/- 0.2) x 10(12) s(-1), respectively. Analysis of the anisotropy of spin-lattice relaxation has demonstrated that the reorientation mechanism of the butyl fragment changes to a free diffusion rotational mechanism above 173 K, while the rotational mechanism of the methyl groups remains the same. The values of the activation barriers for both rotations at T > 173 K have the values, which are similar to those at 103-133 K. This indicates that the interaction potential defining these motions remains unchanged. The obtained data demonstrate that the detailed analysis of both line shape and anisotropy of spin-lattice relaxation represents a powerful tool to follow the evolution of the molecular reorientation mechanisms in organic solids.