[CONTRIBUTION FROM THE TECHNICAL DEVELOPMENT SERVICES, COMMUNICABLE ... Some Esters of 2-Trichloro-l-(p-chlorophenyl)-ethanol as Potential Insecticides ... BY T. C. CHEN~ AND WT SUMERFORD ... Introduction Since the introduction of DDT, 2,2-bis-(p- chloropheny1)-l,l,l-trichloroethane, as a potent contact insecticide with residual characteristics, a number of its structural analogs have been pre- pared in an effort to ...