H-2 NMR spectra of solid 2-bromotoluene-alpha-D, 1-methyl naphthalene-
alpha,alpha-D2 and 2-methyl naphthalene-alpha,alpha-D2 have been measu
red at 46 MHz and various temperatures. In all three cases dynamical e
ffects have been observed down to rather low temperatures. A prelimina
ry discussion will be presented.