PROCESS FOR THE PREPARATION OF DIBENZENESULFONIMIDE

Abstract

The present invention provides a process for the preparation of dibenzenesulfonimide.

Claims

1. A process for the preparation of dibenzenesulfonimide of Formula I, ##STR00007## the process comprising; a) treating compound of Formula III with compound of Formula IV in the presence of compound of Formula V, ##STR00008## where R.sub.1 and R.sub.2 are independently selected from group consisting of fluorine, chlorine, bromine, iodine, C.sub.1-6 alkyl, C.sub.1-6alkoxy, C.sub.1-6alkylsulfonyl, C.sub.1-6perfluoroalkylsulfonyl and cyano, the R.sub.3, R.sub.4 and R.sub.5 are independently selected from optionally substituted C.sub.1-6 alkyl and optionally substituted C.sub.1-6aryl, b) isolating the compound of Formula I from the reaction mixture.

2. The process of claim 1, wherein step a) take place at a temperature in the range of 10 C. to 40 C.

3. The process of claim 1, wherein step a) takes place in the presence of solvent.

4. The process of claim 3, wherein the solvent is acetonitrile.

5. The process of claim 1, wherein step b) is carried out by layer separation, distillation, filtration, evaporation and decantation or mixture thereof.

6. The compound of Formula I, as obtained by the process of claim 1, has the purity greater than 98%.

Description

EXAMPLE

Example 1

Preparation of Dibenzenesulfonimide

[0018] Benzenesulfonamide (50 g), acetonitrile (150 g) and triethylamine (97 g) were taken in a reaction vessel and stirred for 45 minutes. The benzene sulfonyl chloride (69 g) was added drop-wise to the reaction mixture at 20 C. The reaction mixture was additionally stirred at 25 C. for 45 minutes. The acetonitrile was recovered by evaporation and solid reaction mass was dissolved in sodium hydroxide (20%, 300 g). The aqueous layer was separated, washed with chloroform and acidified with hydrochloric acid (35%) to obtain the title product.

[0019] Yield (g): 90

[0020] Purity (% by HPLC): 99.2