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The substitution reactions of XC6H4COCl [X=2-, 3-, or 4-CH3; 2-, 3-, or 4-CH3O; 2-, or 4-I; or 2-, 3-, or 4-NO2] and YC6H4COONa [Y=2-, 3-, or 4-CH3; 2-, 3-, or 4-CH3O; 2-I; 4-NO2; or H] in a two-phase H2O/CH2Cl2 medium using pyridine-1-oxide (PNO) as an inverse phase transfer catalyst were investigated. In general, the kinetics of the reaction follows a pseudo-first-order rate law, with the observed...