The action of p-toluene-sulphonyl chloride on ethyl 2-oxy-3 : 5-dinitro-l-benzoate and ethyl 4oxy- 3:5-dinitro-I-benzoate has been examined. In both the cases the OH group is replaced by chlorine, the presence of diethylaniline as the condensing reagent. These chloro compounds have been found to be identical with the dinitrochlorobenzoic esters obtained by nitrating o and p-chlorobenzoic acids respectively and subsequent esterification. The action of various amines and amino compounds on these chIoro compounds has also been studied.