337P日本大胆欧美裸体艺术_久久久久精品无码专区_一个人看的免费视频WWW中文字幕_欧美熟妇精品视频网免费观看
第 37 卷第 2 期Vol. 37 No. 2
2007 年 4 月Apr 2007

所屬欄目:農藥及中間體

4-氨基-3,5-二氯-2,6-二氟吡啶的合成研究
楊劍波,龐懷林,黃超群,陶賢鑒 (湖南化工研究院,湖南 長(cháng)沙 410007)
摘 要:以3,5-二氯-2,4,6-三氟吡啶(TFP)為原料,水為溶劑,采用帶壓氨解合成氟草煙的中間體4-氨基-3,5-二氯-2,6-二氟吡啶,對反應條件進(jìn)行了研究,優(yōu)化反應條件為:反應溫度80℃,反應時(shí)間30 min,物料比n(TFP) ∶ n(氨水) = 1 ∶ 3.5,芐基三乙基氯化銨的用量為T(mén)FP質(zhì)量的5%。優(yōu)化反應條件下收率為83.5%,產(chǎn)品含量為98.6%,其結構經(jīng)紅外分析、元素分析、核磁共振確證。
關(guān)鍵詞:3,5-二氯-2,4,6-三氟吡啶;氨化;4-氨基-3,5-二氯-2,6-二氟吡啶;合成
Synthesis of 4-Amino-3,5-dichloro-2,6-difluoropyridine
YANG Jian-bo,PANG Huai-lin,HUANG Chao-qun,Tao Xian-jian(Hunan Research Institute of Chemical Industry,Changsha 410007,China)
Abstract:4-Amino-3,5-dichloro-2,6-difluoropyridine,an important intermediate of fluroxypyr,was synthesized from 3,5-dichloro-2,4,6-trifluoropyridine(TFP)via reaction of amination using water as the solvent and under the pressure. The optimum reaction conditions were abtained as follows. Temperature was 80℃,reaction time was 30min,the molar ratio of TFP and aqueous ammonia was 1 ∶ 3.5,the catalyst (benzyl triethyl ammonium chloride)amount was 5% comparing to TFP(m/m). The yield and purith was 83.5% and over 98.6%,respeetively. The product was confirmed by IR、elementary and 1H NMR.
Key words:3,5-dichloro-2,4,6-trifluoropyridine;amination;4-amino-3,5-dichloro-2,6-difluoropyridine;synthesis
作者簡(jiǎn)介:楊劍波(1968-),女,湖南長(cháng)沙人,副研究員,主要從事農藥及其中間體的合成研究。(E-mail:yjb8010@sina.com)
收稿日期:2006-12-28
閱讀全文
337P日本大胆欧美裸体艺术_久久久久精品无码专区_一个人看的免费视频WWW中文字幕_欧美熟妇精品视频网免费观看