留言 07-02-11 00:20 發(fā)布者:謝東峰專家姓名：張?jiān)l(fā)
性別：男技術(shù)職稱：高級(jí)工程師
年齡：退休- 所在地區(qū)：中國(guó)/上海
- 【專業(yè)方向】有機(jī)化學(xué)，氟化學(xué)
- 【技術(shù)服務(wù)】該專家愿意提供以下技術(shù)服務(wù)：指導(dǎo)精細(xì)化工產(chǎn)品合成，農(nóng)藥醫(yī)藥中間體技術(shù)資料，中小化工產(chǎn)品技術(shù)創(chuàng)新.
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2,6-二氯-3-硝基吡啶
請(qǐng)問2,6-二氯-3-硝基吡啶有一些什么用處！希望您能幫我解決這個(gè)問題！我找了很多資料一直都沒有找到這方面的！謝謝您 了！您可以給我郵件解答！謝謝！
咨詢者：謝東峰 咨詢時(shí)間：2006-05-27 狀態(tài)：已回復(fù)
專家 張?jiān)l(fā) 解答表達(dá)感謝 繼續(xù)咨詢?cè)搯栴} 參與討論-
2,6-dichloro-3-nitropyridine has useful herbicidal properties. Furthermore, this compound is useful as a chemical intermediate for dyes, pharmaceutical and other agricultural applications.
It is known that 2,6-dichloropyridine could be nitrated with a mixture of HNO.sub.3 and H.sub.2 SO.sub.4 to give 2,6-dichloro-3-nitropyridine. See Johnson et al, J. Chem. Soc. (B), 1967, pp. 1204-1210 and U.S. Pat. No. 3,809,695, issued to Steinmetz et al on May 7, 1974. However, the nitration reactions disclosed by these prior art references employed relatively high molar ratios of HNO.sub.3 to 2,6-dichloropyridines (i.e., both were over 10:1) to effect the nitration. Also, these inventions were accompanied by the evolution of hazardous brown nitrogen oxides from the reaction mixture. On large commercial scale operations, the employment of this relatively high molar ratio and evolution of hazardous fumes are both undesirable because of the low productivity associated with the high levels of HNO.sub.3 needed and possible environment problems, respectively.
Accordingly, it would be beneficial if the conditions of this nitration reaction could be improved so that lower molar ratios of HNO.sub.3 to 2,6-dichloropyridine could be employed and little or no evolution of nitrogen oxides occurred during the reaction.
laozhang
回復(fù)：張?jiān)l(fā) 回復(fù)時(shí)間：2006-06-02
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