Phosgene → 5-Methoxy-1,3-dimethyl-1H-pyrazole-4-sulfonyl isocyanate

Participants

Reaction Steps

Into a mixture of 100 ml of dry benzene and 9.12 g (0.03 mol) of N-(n-butylcarbamoyl)-1,3-dimethyl-5-methoxypyrazole-4-sulfonamide, under reflux, 8.9 g (0.09 mol) of phosgene was passed over 1.5 hours. Then, the reaction mixture was further refluxed for 30 minutes. After completion of the reaction, evaporation of benzene under reduced pressure gave crude 1,3-dimethyl-5-methoxypyrazole-4-sulfonyl isocyanate as an oil.

Provenance & Evidence