R= PhCD,'or 3D-10D 1 consisting in reduction of qa, a-trichlorotoluene with zinc-acetic acid- d,(AcOD) to toluene-a, cY, cY-d3, and bromination of the latter. In our method6, sodium phenylacetate is refluxed with 1520% sodium deuteroxide in deuterium oxide until the desired degree of H+= D exchange has