c acid (I) was obtained by method [5]. The alkylation of I by butyl iodide in NaOH aqueous solution under interphase catalysis conditions did not yield positive resutls. We did succeed in alkylating I in acetone in the presence of potassium carbonate by the method in [ii]. However, this resulted in the formation of alkylation products both for the phenol hydroxyl and the carboxyl group. Complete alkylation of the phenol group required an excess of butyl iodide of not less than 3 moles per mole of I. This resulted in a good yield of the butyl ester of 2-butoxy-4-chlor~benzoic acid (II). Alkylation of the ethyl ester of 4-chlorosalicyli c acid (III), obtained by the method in [15] with butyl iodide under similar conditions produces a good yield of the ethyl ester of 2-butoxy-4-chlorobenzoic acid (IV) and makes it possible to halve the consumption of butyl iodide and potassium carbonate. Alkaline hydrolysis of the esters of II and IV yielded 2-butoxy-4-chlorobenzoic acid (V). The structure of II, IV, and V was confirmed by IRspectroscopy and element analysis. Compounds II, IV, and V had the following absorption bands in the IR-spectra (at cm-1): II - 1730, 1130 (COOR), 1230, 1072 (Ar-<)-C); IV - 1730, 1290, 1132 (COOR), 1235, 1072 (Ar-<}-C); V - 3090, 1668, 1440, 1290 (COOH), 1240, 1080 (Ar-O-C). The structure of V was also confirmed by its titration with 0.i N NaOH in ethanol with phenolphthalein as the indicator. of compound V by chlorosulfonic acid either in chloroform or without a solvent at 65 5~ is accompanied by the splitting of the simple ester bond and the substitution of the carboxyl gorup. This is confirmed by the formation of butyl alcohol and CO 2. We were not able to extract individual sulfochlorides from the resultant oily product which contained no less than three compounds, according to TLC data. When the mixture was treated with ammonia sulfochlorides, the result was a mixture of sulfamides from which we obtained low yields of 4-chloro-5-sulfamoylsalicylic acid (VI) and 2-butoxy-4-chlor-5-sulf~moylbenzoic acid (VII). We also observed the cleavage of the simple ester bond and the subsequent formation of sulfochloride mixtures when esters II and IV were sulfochlorinated under similar conditions. This difficulty could not be overcome by lowering the reaction temperature. Therefore, the sulfochlorination of compound V or its esters by chlorosulfonic acid in order to obtain compound VII is of no preparative significance.