Hydrochloric Acid → 2,4-dihydroxybenzenesulfonic Acid

Participants

Reaction Conditions

Reaction Steps

15.0 g (0.136 moles) of resorcinol, 102 g dimethyl carbonate and 68 g cyclohexane were charged under nitrogen to a 4-necked one litre reactor fitted with stirrer, thermometer and condenser attached to an HCl scrubber system. The reaction mixture was heated to 60° C. and 15.1 g (0.13 moles) of chlorosulphonic acid added over a period of 4 h with removal of hydrogen chloride gas. On completion of the addition, the reaction mixture is heated to 70-72° C. for 1 h, and then cooled to 20° C. The reaction mixture separated into two layers with the lower layer containing 2,4-dihydroxybenzene sulphonic Acid (63.2% by hplc) and resorcinol (31.5% by hplc).

Provenance & Evidence