Thermal fragmentation of N-aryl-N-benzoylthiourea I-III (aryl = p-tolyl, 2-
pyridyl, o-hydroxyphenyl) gave rise to benzonitrile, benzoic acid, benzamid
e, benzil, aryl isothiocyanate, N,N-diarylthiourea, the corresponding imada
zoles, and anilides. A free radical mechanism has been postulated to take p
lace through the homolysis of C-N and C-S bonds to account for the identifi
ed products.