one or more halogen r 12 is halogen straight or branched chain alkyl having up to three carbon atoms which is un substituted or is substituted by one or more halogen or a member selected from the group consisting of nitro cyano u2014 s o p r 3 and u2014 or 5 z is r 4 u2014 nr 8 r 13 u2014 nr 8 u2014 nr 13 r 14 u2014 sr 7 or u2014 or 7 and the process for preparing a compound of the above formula i comprises wherein r 15 is a straight or branched chain alkyl group having up to six carbon atoms with a compound of formula iii in an aprotic solvent in the absence of a base to form a compound of formula iv ii reacting a compound of formula iv with a compound that contains a leaving group l such as alkoxy or n n dialkylamino esp ethoxy and ch och 2 ch 3 3 to form a compound of formula v iii reacting a compound of formula v with hydroxylamine or a salt of hydroxylamine to form a compound of formula i wherein the process further comprises producing the compound of formula iii by providing gas phase raw materials in a substantial theoretical stoichiometric ratio to the converging section of a converging diverging funnel mixer wherein said.