Patent ID: 8791229

Claim:
A process for preparing the compound of formula (I) wherein R 1 -R 4 are each selected from the group consisting of hydrogen atom, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, C 1 -C 6 haloalkyl, C 3 -C 7 cycloalkyl, —CF 3 , —OCF 3 , and halogen atom; A is —O— or Q is selected from the group consisting of —NO 2 , —NH 2 , and m is an integer of 1-4, comprising reacting an organophosphorous compound of formula (II) with a compound of formula (III) in a solvent in the presence of a catalyst to form the compound of formula (I); wherein B is halogen or X is halogen, and Q is defined as above.