Hydrochloric Acid → 2,6-Dichloro-N-(((4-(2,2-dichloro-1,1-difluoroethoxy)phenyl)amino)carbonyl)-benzamide

In 200 milliliters of xylene, 11.5 grams (0.04 mole) of β,β-dichloro-α,α-difluoro-p-phenetidine.HCl and 3.6 grams (0.04 mole) of 2,6-dichlorobenzoyl isocyanate were refluxed with stirring for two hours. The xylene was thereafter removed by vacuum distillation. The residue which remained was mixed with 200 milliliters of hexane and a crystalline solid precipitated. This precipitated material was collected by suction filtration, washed with hexane and dried. The dried crude product was a light tan gummy solid melting at 160°-185° C. This crude product was purified by recrystallization from 60 milliliters of 83 percent aqueous acetic acid, leaving 85 grams of a white solid melting at 211°-213° C. (56 percent of theoretical). Nuclear magnetic resonance spectroscopy confirmed the structure as being ##STR13##