Naphthalene → 1-Naphthalenesulfonic acid

Participants

Reaction Steps

128 g (1 mole) of naphthalene are dissolved in 153 g (1.5 mole) of acetic anhydride. The resulting solution is added, under stirring, with 98 g (1 mole) of a 100% sulphuric acid for 95 minutes while gradually raising the temperature from 30° to 45° C. Further sulphonation of naphthalene is conducted at a temperature of 45° C. for an additional 45 minutes following the procedure described in the foregoing Example 1 to give 208 g of naphthalene-α-sulphonic acid, 145 g of glacial acetic acid and 25.5 g of acetic anhydride.

Provenance & Evidence