This study was undertaken with a view to the synthesis of new organic compounds of arsenic, especially those containing aC (O)-N= linkage. The very reactive dichloro-p- arsinobenzoyl chloride, C~~ ASC~ H~ COCI, was chosen as a starting point and was condensed with various aromatic primary and secondary amines, such as aniline, ethyl aniline, anthranilic acid, anisidine, phenetidine, and arsanilic acid to give compounds of ...