摘要:
Tetrachloro-2-cyanobenzoic acid alkyl esters of formula ##STR1## wherein R is C.sub.1 -C.sub.5 alkyl, can be very conveniently prepared by (a) reacting the ammonium salt of tetrachloro-2-cyanobenzoic acid, in the presence of water and an inert organic solvent, with a hydroxide of formula MOH, wherein M is Na or K, and removing the ammonia evolved, and(b) reacting the resultant salt of the formula ##STR2## wherein M is as defined above, with at least 1 mole of a dialkyl sulfate of formula SO.sub.2 (OR).sub.2 or an alkyl halide of formula RHal, wherein R is as defined above and Hal is Cl, Br, I or F, also in the presence of water and an inert organic solvent.