Sulphonation of 2,6-dimethoxynaphthalene. Reaction mechanisms and products.

Protonation and sulphonation mechanism of 2,6-DMON is described. The products of their sulphonation, the sodium and barium salts of 2,6-DMON-4-monosulphonic acid and of 2,6-DMON-4,7-disulphonic acid have been prepared and characterized.