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2-氯-5-(4-氯-1-甲基-5-三氟甲基-1H-吡唑-3-基)-4-氟苯甲醛的合成

Synthesis of 2-chloro-5-(4-chloro-1-methyl-5-trifluoromethyl-1H- pyrazol-3-yl)-4-fluorobenzaldehyde
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摘要 2-氯 - 5 - (4 -氯 - 1-甲基 - 5 -三氟甲基 - 1H-吡唑 - 3-基 ) - 4-氟苯甲醛是合成除草剂的中间体。它可以通过以下 2步反应制得 :首先 ,4-氯 - 3- (4 -氯 - 2 -氟 - 5 -甲基苯基 ) - 1-甲基 - 5 -三氟甲基 - 1H-吡唑在乙酸 /乙酐混合溶剂中用三氧化铬氧化 ;然后 ,在乙醇 /水混合溶剂中 ,用碳酸氢钠催化水解得目的产物。 2步反应总收率达到71.6 %。 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%.
出处 《化学反应工程与工艺》 CAS CSCD 北大核心 2002年第4期373-376,共4页 Chemical Reaction Engineering and Technology
关键词 2-氯-5-(4-氯-1-甲基-5-三氟甲基-1H-吡唑-3-基)-4-氟苯甲醛 合成 除草剂 氧化 水解 chloro-5-(4-chloro-1-methyl-5-trifluoromethyl-1H-pyrazol-3-yl)-4-fluorobenzaldehyde 4-chloro-3-(4-chloro-2-fluoro-5-methoxyphenyl)-1-methyl-5-trifluoromethyl-1H-pyrazole 2-chloro-5-(4-chloro-1-methyl-5-trifluoromethyl-1H-pyrazol-3-yl)-4-flu
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