55791-04-3

Reagent for converting, under mild conditions, alcohols into methanesulfonate (mesylate) esters and primary and secondary amines into methanesulfonamides.

N, N-Diethyl-N-methyl-N-(methylsulfonyl)ammonium Fluorosulfate is prepared from the reaction of MeSO2NEt2 with excess neat MeOSO2F at 50 °C for 72 h.

Hygroscopic; hydrolyzed by moist air (products corrosive); stable indefinitely in a sealed ampoule at rt.