PROCESS TO PRODUCE FLUORINATED BETAINES

摘要

A process to prepare fluorinated sulfobetaine compounds of formula (I), wherein Rf is C2 to C10 fluoroalkyl optionally interrupted by one or more of O, CH2, CHF, or combinations thereof; R1 is C1 to C10 alkylene; R2 is C1 to C6 alkylene or a chemical bond; R3 is H or CH3; R4 is C1 to C6 alkylene containing at least one hydroxyl group; R5 is H or CH3; and R6 is H or CH3; comprising contacting a fluorinated sulfonamide amine of formula (II), with an aliphatic chlorosulfonic acid or salt thereof of formula (III), in the presence of water and at least one alkylene glycol, and optionally at least one alkyl carbonate, said fluorinated sulfobetaine having reduced free chloride content and reduced flammability without the need for additional purification steps.