The dynamic behavior of phenylacetylene-d(1) dissolved in the nematic liquid-crystalline phase Merck ZLI-1695 is investigated by means of deuterium and H-1 NMR. Spectral densities J(0)(O), J(1)(w), and J(2)(2w) relevant for i deuterium relaxation are obtained from a nonselective inversion recovery, a modified Jeneer-Broekaert and a selective spin-echo experiment. The rotational correlation time, tau(c) is calculated from J(2)(2w). J(0)(O) can be explained more or less by rotational diffusion, but the value of J(1)(w) is anomalously low. The anisotropy of rotational diffusion is obtained by H-1 relaxation measured by the NOESY technique. Reorientation about the long axis of the molecule is about twice as fast as reorientation of the axis itself.