Patent ID: 8765970

Claim:
An enantiomerically enriched 3-triazolyl sulphoxide of formula (I), wherein X 1 and X 2 , Y 1 and Y 2 are each independently selected from the group consisting of fluorine, hydrogen, and (C 1 -C 6 )haloalkyl, R 1 and R 2 are each independently selected from the group consisting of fluorine, and methyl, and R 3 is amino, where the enantiomer ratio is 60:40 to 99.5:0.5 (+):(−)enantiomer, and wherein said 3-triazolyl sulphoxide of formula (I) is prepared by a process comprising reacting a sulphide of formula (II) in which each of X 1 , X 2 , Y 1 , Y 2 , R 1 , R 2 and R 3 is as defined above, with an oxidizing agent, in a solvent, and in the presence of a chiral catalyst, at a reaction temperature between 10° C. and 60° C., wherein the oxidizing agent is hydrogen peroxide; and the chiral catalyst is a chiral metal-ligand complex comprising a transition metal and a chiral ligand, wherein the transition metal is vanadium, iron or manganese.