| abstract |
The present invention relates to an improved process for the preparation of 2-chloro-3,5-bis (trifluoromethyl) phenyl benzoyl urea derivatives of the formulan n n n n n n n n n In the above formulan n n A represents -N = or -CH =,n n n X 1 and X 2 each independently represent a hydrogen atom or a halogen atom, preferably fluorine, chlorine or bromine. |