Patent ID: 7232927

Claim:
Process for preparing compounds of the formula (I), where R 1 and R 2 are each independently C 1 -C 20 -alkyl, C 4 -C 15 -aryl or C 5 -C 16 -arylalkyl, or R 1 and R 2 together are a straight-chain or branched C 3 -C 12 -alkylene radical arid R 3 is C 1 -C 20 -alkyl, C 1 -C 20 -fluoroalkyl or C 4 -C 15 -aryl, comprising reacting diamines of the formula (II) where R 1 , R 2 and R 3 are as defined under formula (I) in the presence of water and in the presence of organic solvent and in the presence of a base comprising alkali metal, alkaline earth metal hydroxide, or carbonate, with sulphonyl halides of the formula (III) R 3 SO 2 X (III) where X is fluorine, chlorine, bromine or iodine and R 3 is as defined under formula (I).