Zhou Yu
2002
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Journal
Chemical Reaction Engineering and Technology
Abstract
chloro-5-(4-chloro-1-methyl-5-trifluoromethyl-1H-pyrazol-3-yl)-4-fluorobenzaldehyde, a key intermediate of herbicides, was prepared through oxidation of 4-chloro-3-(4-chloro-2-fluoro-5-methoxyphenyl)-1-methyl-5-trifluoromethyl-1H-pyrazole with chromium trioxide in acetic acid/acetic anhydride, following by hydrolysis with exist of sodium bicarbonate. The expermental results showed that the total yield reached 71.6%.