Several new syntheses of 1and 4-[14C] anisole have been investigated and routes from [14C] cyanide and from 2-[14C] acetone are described which are better than those previously reported. The key step in one of the syntheses was catalytic dehydrogenation of 1- [14C] cyclohexanone to 1-[14C] phenol. Degradation of 5, 6, 7, 8-tetrachloro-3, 4-dihydro-1, 4-etheno-[14C] naphthalen-2 (1H)-one (10) prepared from [14C] anisole and ...