Derivatives of the carboxylic acids RCOCH2CH (OCH3) COOH and RCOCH= CHCOOH (R= Me, i-Bu, or tert-Bu) have been identified among the major methanolysis products of three 1, 1, 1-trichloro-2-hydroxy-4-alkanones, RCOCH2CH (OH) CCl3. In addition, β-methoxy esters RCOCH (OCH3) CH2COOCH3 are obtained if hydrogen atoms are present at the alkyl carbon directly attached to the carbonyl group (R= Me or i-Bu). 1, 1, 1-Trichloro-2-hydroxy- ...