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id="mwogv3s" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="kegsfmo" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="37asdpr" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>衢州2-甲基四氫呋喃規(guī)格是多少,2-甲基四氫呋喃</p><p><span>***更新：</span>2021-01-12 05:18:29</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="akhjqnk" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海蔚云化工有限公司</a></p><p><span>聯(lián)系人：</span>盛志華</p><p><span>郵箱: </span>3273929241@qq.com</p><p><span>電話: </span>18721726651</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.weiyunhuagong.com</p><p><span>手機: </span>021-52909928</p><p><span>地址: </span>靜安區(qū)靈石路709號55幢A2113室</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="cr8m3ik" class="page-proshow02"><p class="title">詳細說明</p><div id="xrj3tqn" class="box"><p><p style="text-indent:25px">5-二取代的四氫呋喃類混合物的制備方法，包括：在多相醚化催化劑、多相氫化催化劑和氫氣存在的條件下，將5-羥甲基糠醛或5-羥甲基糠醛的水溶液與醇混合后發(fā)生醚化還原反應得到的液態(tài)中間產(chǎn)物；然后再在第二催化劑的作用下，使得到的液態(tài)中間產(chǎn)物發(fā)生加氫反應，得到2，5-二取代的四氫呋喃類混合物。該制備方法通過兩步法實現(xiàn)5-羥甲基糠醛向目標產(chǎn)物的轉(zhuǎn)化，衢州2-甲基四氫呋喃規(guī)格是多少，得到的2，5-二取代的四氫呋喃類混合物可作為潛在的燃料或者燃料添加劑。含有四氫呋喃的藥物共有13個。這些藥物涵蓋心血管疾病，傳染病，泌尿系統(tǒng)疾病，ai癥和糖尿病等多種***領域。這些藥物中的四氫呋喃都含有手性中心，其中特拉唑嗪和阿夫唑嗪為外消旋體。另外，有4種藥物含有兩個四氫呋喃環(huán)，包括地瑞那韋、異山梨醇二硝酸酯、異山梨醇單硝酸酯。天然產(chǎn)物包括伊維菌素、依前列醇及軟海綿素B的合成類似物艾日布林。泊沙康唑含有一個季碳手性中心，衢州2-甲基四氫呋喃規(guī)格是多少，其抗***效果優(yōu)于早期的酮康唑等抗***藥，衢州2-甲基四氫呋喃規(guī)格是多少，它對曲霉菌以及對先前的抗***藥具有抗性的其它******均有效。相反從化合物上脫落的過程叫去甲基化。衢州2-甲基四氫呋喃規(guī)格是多少</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="衢州2-甲基四氫呋喃規(guī)格是多少,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png"></div><p style="text-indent:25px">應用實例：鹽酸曲馬多合成中的應用鹽酸曲馬多，在抗HIV藥替普那韋合成中的應用替普那韋，在血管緊張素轉(zhuǎn)化酶控制劑馬來酸依那普利合成中的應用馬來酸依那普利，在抗***藥氟康唑合成中的應用氟康唑，在抗藥三尖杉酯堿合成中的應用，在抗抑郁藥鹽酸安非他酮合成中的應用芳樟醇芳香酮，在芳樟醇/香酮合成中的應用，在農(nóng)藥草銨膦合成中的應用，在聯(lián)苯醇的合成中應用。 MeTHF凝固點為-136℃，因而它可以替代THF用于低溫下有機鋰反應。在有機鋰化學中，使用MeTHF作溶劑與THF相比，不僅分離方便，而且所得的鋰。紹興2-甲基四氫呋喃生產(chǎn)線聚四氫呋喃主要用作嵌段聚氨酯或嵌段聚醚聚酯的軟鏈段。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="衢州2-甲基四氫呋喃規(guī)格是多少,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624283199578/5832986.png"></div><p style="text-indent:25px">利用微生物還原汞的功能,可使金屬汞沉淀回收,揮發(fā)的汞可用活性炭吸附。微生物除汞方法主要有選育高效抗汞微生物處理含汞廢水：如應用選育的高效抗汞菌，假單胞桿菌 K62可處理含甲基汞、乙基汞、**、乙酸汞、硫酸汞、氧化汞和**等廢水，金屬汞回收率達80%以上，菌體能重復用三次。采用除汞：依靠活性污泥中的抗汞菌將汞還原為金屬汞，活性污泥系統(tǒng)本身還可吸附汞。采用濾池法除汞：用馴化活性污泥掛膜處理生化需氧量 (BOD)低的含汞廢水。使用硫化氫沉淀汞：借助于其他微生物產(chǎn)生的硫化氫與水溶性汞結(jié)合成硫化汞，硫化汞溶度積很小，可以在沉淀后除去。</p><p style="text-indent:25px">四氫呋喃普遍用于表面涂料，保護性涂料，油墨，萃取劑和人造革的表面處理，也專是制藥行業(yè)的主要溶屬劑。普遍應用于樹脂溶劑（磁帶涂層、PVC表面涂層、清洗PVC反應器、脫除PVC薄膜、玻璃紙涂層、塑料印刷油墨、熱塑性聚氨酯涂層）；反應溶劑（格式試劑、烷基堿金屬化合物和芳基堿金屬化合物、氫化鋁和氫化硼、甾族化合物和大分子有機聚合物）；色譜溶劑（凝膠滲透色譜法）。四氫呋喃也是生產(chǎn)聚四亞甲基醚二醇重要原料，并用于天然氣加味。是一種重要的有機合成原料且是性能優(yōu)良的溶劑，特別適用于溶解PVC、聚偏氯乙烯和丁苯胺，普遍用作表面涂料、防腐涂料、印刷油墨、磁帶和薄膜涂料的溶劑，并用作反應溶劑，用于電鍍鋁液時可任意控制鋁層厚度且光亮。甲基，化學式為-CH?，由碳和氫元素組成。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="衢州2-甲基四氫呋喃規(guī)格是多少,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624080435939/3968180.png"></div><p style="text-indent:25px">聚四氫呋喃二醇的工業(yè)化生產(chǎn)工藝根據(jù)催化劑的不同主要有氟磺酸催化聚合工藝、乙酸酐-高氯酯催化聚合工藝和雜多酸催化聚合工藝。其中氟磺酸催化工藝對設備材質(zhì)要求較高，造價昂貴，所需氟磺酸的量大。工業(yè)化的乙酸酐-高氯酸催化工藝，由THF原料經(jīng)二乙酸酯中間體制取PTMEG，副產(chǎn)物為乙酸甲酯和甲醇，生產(chǎn)成本較氟磺酸法低。開發(fā)的雜多酸催化工藝，采用由Mo、W、V的氧化物與磷酸反應制得多聚酸，如十二聚磷鎢酸為催化劑，一步法制得PTMEG，且催化劑為固態(tài)，可回收，是一種新工藝。實驗室制備PTMEG：在反應釜中加入四氫呋喃，溫度降到-5℃以下，于強烈攪拌下滴加發(fā)煙硫酸催化劑，保持反應物料低溫，攪拌下加入定量的水，升溫至70～90℃，蒸出未反應的四氫呋喃單體，經(jīng)靜置分層、中和過渡、抽真空等工序后，制得聚四氫呋喃二醇。四氫呋喃分子是由4個C原子、8個H原子和1個O原子組成的。紹興2-甲基四氫呋喃生產(chǎn)線</p><p style="text-indent:25px">甲基呋喃可用于溶液聚合中作溶劑使用。衢州2-甲基四氫呋喃規(guī)格是多少</p><p style="text-indent:25px">當以2-甲基四氫呋喃為溶劑，Ag2CO3為氧化劑，三甲基環(huán)三硼氧烷為甲基化試劑，Cp*Co(PhH)(PF6)2作為催化劑，可獲得較佳反應結(jié)果（Table 1）。對底物范圍進行了擴展。反應結(jié)果表明，藥物分子中常見的氮雜環(huán)（3a–3e）或者酰胺基團（3f–3p），均與體系兼容。一級酰胺由于缺乏導向基團，從而導致具有合成難度，但增加催化劑用量，也可以實現(xiàn)鄰位的甲基化（3k-3m）。二級苯甲酰胺（3f-3j）不論是否有立**阻或環(huán)狀，都是很好的底物。三級酰胺1n 和1o可以選擇性的單甲基化，含溴的底物3o也沒有出現(xiàn)副反應。底物3p和3z的產(chǎn)物出現(xiàn)了區(qū)域選擇性產(chǎn)物。醛和酮與含氮相比堿性更弱，少見作為C-H活化的底物，但在富電子的芳香環(huán)上，這個方法可以生成3q和3s。稠環(huán)芳香烴，可以選擇性的在1-位甲基化。然而，酯和羧酸不適用該體系。衢州2-甲基四氫呋喃規(guī)格是多少</p><p style="text-indent:25px">上海蔚云化工有限公司致力于化工，是一家貿(mào)易型的公司。上海蔚云化工致力于為客戶提供良好的環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺，一切以用戶需求為中心，深受廣大客戶的歡迎。公司注重以質(zhì)量為中心，以服務為理念，秉持誠信為本的理念，打造化工良好品牌。在社會各界的鼎力支持下，持續(xù)創(chuàng)新，不斷鑄造***服務體驗，為客戶成功提供堅實有力的支持。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2810340.html</p></div></div></div></div></div><div id="j7j9npb" class="page-right twoColRt"><div id="2el7tfm" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="movsfct" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" class="vcenter" 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