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The crystal structure of chloral ethylhemiacetal has been determined at 291 K: monoclinic, space group C 2  2  - P2 1 , Z = 2, a = 854.5(1), b = 594.0(3), c = 853.3(1) pm, β = 108.30(2)°, R = 0.0962. A sharp decrease of the spin lattice relaxation time T 1  found for the  35 Cl NQR of the CCl 3  groups in chloral methyl-, ethyl-and n-heptylhemiacetals is attributed to the onset of reorientation of the group over a potential barrier o f ca. 39, 37, and 32 kJ/mol, respectively. An unusual T 1  vs. 1/T curve with a T 1  minimum superimposed on the sharp decrease of T 1  due to the reorientation was observed for each of the three  35 Cl NQR lines of nHp-CH . This phenomenon is tentatively ascribed to a fluctuation of EFG caused by jumping motion of the hydrogen atom s in the OH groups.

35 Cl NQR Relaxation and Hydrogen Bond in Some Chloral Hemiacetals