A rapid and green synthesis of 1,1-diacetates from aldehydes catalyzed by triethylamine-bonded sulfonic acid [Et3N–SO3H]Cl

Bronsted acidic ionic liquid, [et3n–so3h]cl, catalyzed the reaction of acetic anhydride with arylaldehydes under solvent-free condition. various 1,1-diacetates are obtained using 15 mol% oftriethylamine-bonded sulfonic acid in satisfactory to excellent yields in very short reaction times atambient temperature. different groups including electron donating or electron withdrawing groups linkedto benzene ring such as methyl, chloro, nitro and methoxy were tolerated under the optimized reactionconditions. this ionic liquid was air stable and easily prepared from accessible amine and chlorosulfonicacid. the present report is a green protocol as it eliminates the need of an organic solvent. very shortreaction times, high yields, simple operational procedure and green conditions are merits of thismethodology.