In a search for new pest-control agents, the following substituted sulphanilyl hydrazides have been prepared: 2- and 3-chloro; 2,5- and 3,5-dichloro; 3-nitro; 3,5-dinitro and 2,5-dimethoxy. Diphenyl ether 4,4′-bis-sulphonhydrazide and the 4-bromodiphenyl ether 4′-sulphonhydrazide are also described. The hydrazides have been converted into a number of derivatives (e.g., hydrazones, azides). A brief account of the relative ease and orientation of chlorosulphonation is included.