Patent ID: 8901311

Claim:
A process for preparing a heterocyclic fluoroalkenyl sulfone compound of formulas (I) where R 1 is hydrogen or fluorine, and Het is a heterocycle selected from the group consisting of where R 2 is hydrogen, halogen, C 1 -C 4 -alkyl, or C 1 -C 4 -haloalkyl, and R 3 is hydrogen or halogen; or is optionally halogen-, methyl-, ethyl-, n- or i-propyl-, n-, i-, s-, or t-butyl-, methoxy-, ethoxy-, n- or i-propoxy-, or n-, i-, S-, or t-butoxy-substituted C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -alkylthio, C 1 -C 4 -alkylsulfinyl, C 1 -C 4 -alkylsulfonyl, C 1 -C 4 -alkoxycarbonyl, C 1 -C 4 -alkoxy-C 1 -C 4 -alkyl, C 1 -C 4 -alkylthio-C 1 -C 4 -alkyl, carboxyl, C 1 -C 4 -alkylaminocarbonyl, C 3 -C 6 -cycloalkylaminocarbonyl, C 1 -C 4 -dialkyl-aminocarbonyl, C 2 -C 4 -alkenyl, C 2 -C 4 -alkenylthio, C 2 -C 4 -alkenylsulfinyl, or C 2 -C 4 -alkenylsulfonyl, comprising: allowing a sulfide compound of formula (III) where R 1 and Het are each as defined for formula (I), to react with a salt of peroxomonosulfuric acid (H 2 SO 5 ), in a reaction, optionally in the presence of a reaction assistant and optionally in the presence of a diluent to obtain a sulfoxide compound of formula (II) adjusting the pH to a range of 6 to 10; after adjusting the pH of the reaction to a range of 6 to 10, adding more salt of peroxomonosulfuric acid to the reaction; and allowing the resultant sulfoxide compound of formula (II) to react with the salt of peroxomonosulfuric acid at the pH in the range of 6 to 10, optionally in the presence of a reaction assistant and optionally in the presence of a diluent, to produce the sulfone compound of formula (I).