Sulfamic acid derivatives and processes for their preparation

A process for the preparation of a sulfamic acid derivative of Formula I:

• wherein,
• R1 is selected from the group consisting of a hydrogen atom and linear or branched C1-C24alkyl, C6-C10aryl and C5-C10heteroaryl groups, said groups being optionally halogenated, or R1 and the adjacent nitrogen atom together form a salt wherein the nitrogen atom is negatively charged (anion) and R1 is (Mn+)1/n or X+;
• R2 is selected from the group consisting of perfluorinated linear or branched C1-C24alkanoyl, perfluorinated C6-C10aryloyl, perfluorinated C5-C10heteroaryloyl, perfluorinated linear or branched C1-C24alkanesulfonyl, perfluorinated C6-C10arylsulfonyl, and perfluorinated C5-C10heteroarylsulfonyl;
• R3 is F;
• (Mn+) is a metal cation, wherein M is a metal and n is an integer selected from the range of 1 to 4;
• and
• X+ represents an organic cation;
• the process comprising the steps of:
• i) contacting a compound of the formula:
• with a complex of sulfur trioxide and of a tertiary amine and heating at a temperature comprised between about 50° C. and about 300° C.
• ii) optionally contacting the product of step (i) with a chlorinating agent;
• and
• iii) contacting the product obtained in step (i), or in step (ii) when present, with a fluorinating agent to produce a compound of Formula I.