Studies on mesoionic compounds. Part 7. Some aspects of the reaction of the 1,2,3-thiadiazolium-4-olate system

Several derivatives of mesoionic 5-substituted 1,2,3-thiadiazolium-4-olate were synthesised. The 5-aminoderivative (2i) gave a new mesoionic system, 1,2,3-thiadiazolium-5-ethoxycarbonylaminide (4), upon methylation with methyl fluorosulphonate.