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當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁(yè)?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_huagong/">化工</a>?<a href="http://www.cdcfah.com/cp/second-_sysqm/">實(shí)驗(yàn)室器皿</a>?<a href="http://www.cdcfah.com/cp/third-sysqm_qtsysyp/">其他實(shí)驗(yàn)室用品</a>?2-甲基四氫呋喃質(zhì)量上海蔚云化工供應(yīng)</p><div id="c8a8bi8" class="leftbox clearfix"><h1>2-甲基四氫呋喃質(zhì)量上海蔚云化工供應(yīng)</h1><div id="x2w9bdf" class="proBig"><div id="wuw322l" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="ge7vseq" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="hlszliu" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>2-甲基四氫呋喃質(zhì)量,2-甲基四氫呋喃</p><p><span>***更新：</span>2021-01-10 06:17:13</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="eoldah8" 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(jī): </span>021-52909928</p><p><span>地址: </span>靜安區(qū)靈石路709號(hào)55幢A2113室</p><p>[當(dāng)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="ud2zw32" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="bkwyvuw" class="box"><p><p style="text-indent:25px">與游離基的反應(yīng) 呋喃可以和親電的碳游離基反應(yīng)得到2-烷基取代的呋喃。在Pd催化下，帶有吸電子基團(tuán)的溴化物與可以呋喃直接偶合。有機(jī)金屬化合物呋喃鋰鹽在有機(jī)合成中普遍使用。金屬取代的呋喃可以與很多的親電試劑發(fā)生反應(yīng)，而且2-鋰代呋喃也可以發(fā)生金屬的轉(zhuǎn)移反應(yīng)。2-取代呋喃的高價(jià)銅酸鹽可以在低溫下與酮發(fā)生共軛加成反應(yīng)。烯的環(huán)加成光照下羰基化合物與呋喃[2+2]環(huán)加成生成環(huán)醚后，用酸處理可得到3-取代呋喃。呋喃與氰氧化物會(huì)發(fā)生[2+3]環(huán)加成，可用來合成多羥基胺類化合物。二烯的環(huán)加成呋喃以二烯的形式參與Diels-Alder反應(yīng)是呋喃在有機(jī)合成中較普遍的應(yīng)用，提供了很多碳碳鍵的形成方法并可用于后續(xù)的合成。但是由于呋喃本身的芳香性，2-甲基四氫呋喃質(zhì)量，Diels-Alder反應(yīng)速度都很慢。呋喃不僅能與丙二烯化合物發(fā)生Diels-Alder反應(yīng)得到選擇性的產(chǎn)物，2-甲基四氫呋喃質(zhì)量，2-甲基四氫呋喃質(zhì)量，而且還能和乙炔類化合物反應(yīng)。呋喃和不同芳香烯的反應(yīng)是合成多烯化合物的一種很好方法。2-甲基四氫呋喃也可以用在汽車燃料添加劑方面。2-甲基四氫呋喃質(zhì)量</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="2-甲基四氫呋喃質(zhì)量,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png"></div><p style="text-indent:25px">當(dāng)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(yīng)結(jié)果（Table 1）。對(duì)底物范圍進(jìn)行了擴(kuò)展。反應(yīng)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(tuán)（3f–3p），均與體系兼容。一級(jí)酰胺由于缺乏導(dǎo)向基團(tuán)，從而導(dǎo)致具有合成難度，但增加催化劑用量，也可以實(shí)現(xiàn)鄰位的甲基化（3k-3m）。二級(jí)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(jí)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(yīng)。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(gè)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。2-甲基四氫呋喃質(zhì)量甲基作為一個(gè)化學(xué)基團(tuán)，它能夠結(jié)合在DNA上某些特定部位。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="2-甲基四氫呋喃質(zhì)量,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623961490638/1355180.png"></div><p style="text-indent:25px">順酐催化加氫法：順酐和氫氣從底部進(jìn)入內(nèi)裝鎳催化劑的反應(yīng)器，產(chǎn)物中四氫呋喃與γ-丁內(nèi)酯比例可通過調(diào)整操作參數(shù)加以控制。反應(yīng)產(chǎn)物與原料氫氣冷卻至50℃左右進(jìn)入洗滌塔底部，使未反應(yīng)的氫氣及氣態(tài)與液態(tài)產(chǎn)物分離，未反應(yīng)的氫氣及氣態(tài)產(chǎn)物經(jīng)洗滌后循環(huán)到反應(yīng)器，液態(tài)產(chǎn)物經(jīng)蒸餾而得四氫呋喃產(chǎn)品。該工藝可在0～(5∶1)范圍內(nèi)任意調(diào)整γ-丁內(nèi)酯與四氫呋喃的比例，順酐的單程轉(zhuǎn)化率達(dá)99.9%，四氫呋喃選擇性為85%～95%，產(chǎn)品含量達(dá)99.97%。該工藝具有催化劑性能好、流程簡(jiǎn)單、投資少等特點(diǎn)。4-丁二醇脫水環(huán)化法：其工藝過程為：向反應(yīng)器中加入1087kg 22%的硫酸水溶液，在100℃以110kg/h的速度加入1，4-丁二醇，塔頂溫度維持在80℃，以大約110kg/h的速度從塔頂?shù)玫胶?0%四氫呋喃的水溶液。加入50t 1，4-丁二醇后，從反應(yīng)器中排除約70kg焦質(zhì)。將焦質(zhì)進(jìn)行過濾，得到的硫酸水溶液可以重新使用，這一過程的四氫呋喃收率可以達(dá)到99%以上。硫酸是四氫呋喃工業(yè)生產(chǎn)中使用較早的催化劑，也是現(xiàn)今生產(chǎn)中應(yīng)用較多的催化劑。此工藝技術(shù)成熟，工藝比較簡(jiǎn)單，反應(yīng)溫度較低，四氫呋喃收率較高，但硫酸易腐蝕設(shè)備，污染環(huán)境。</p><p style="text-indent:25px">堿和過渡態(tài)金屬的配位，可對(duì)分子結(jié)構(gòu)特定位置上的C-H鍵直接活化，同時(shí)導(dǎo)向基團(tuán)可以提高位置選擇性和轉(zhuǎn)化率。在C-H甲基化反應(yīng)中，現(xiàn)有的導(dǎo)向基團(tuán)一般需要偶聯(lián)試劑（如格氏試劑），利用特殊的基于硼的烷基化試劑或者與貴重金屬鈀催化劑合用的陰離子導(dǎo)向基團(tuán)。但在生物活***物分子中，因結(jié)構(gòu)復(fù)雜、官能團(tuán)多，因此仍缺乏一種通用的合成方法。以分子內(nèi)的官能團(tuán)作為導(dǎo)向基團(tuán)，選用硼甲基化試劑，較關(guān)鍵的是以Cp*配位的(Cp* =C5Me5）高度親電性的Co(Ⅲ)催化劑，可以和更弱的路易斯堿官能團(tuán)配位。鈷催化的甲基化反應(yīng)與其他過渡態(tài)金屬催化過程基本一致，首先鈷催化劑和底物絡(luò)合，經(jīng)C-H鍵活化和金屬交換反應(yīng)后，甲基從硼試劑轉(zhuǎn)移到鈷上，再經(jīng)還原消除，從而獲得甲基化產(chǎn)物，同時(shí)Co(Ⅲ)經(jīng)還原變?yōu)镃o(I)，再通過碳酸銀氧化為Co(Ⅲ)，從而完成催化循環(huán)。四氫呋喃常含有少量水分及過氧化物。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="2-甲基四氫呋喃質(zhì)量,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png"></div><p style="text-indent:25px">四氫呋喃主要用途是作高分子聚合物的前體四氫呋喃是一個(gè)雜環(huán)有機(jī)化合物，分子式為C4H8O。屬于醚類，是芳香族化合物呋喃的完全氫化產(chǎn)物，是一種無(wú)色、可與水混溶、在常溫常壓下有較小粘稠度的有機(jī)液體。這種環(huán)狀醚的化學(xué)式可寫作(CH2)4O。由于它的液態(tài)范圍很長(zhǎng)，所以是一種常用的中等極性非質(zhì)子性溶劑。它的主要用途是作高分子聚合物的前體。盡管THF的氣味和化學(xué)性質(zhì)與**很相似，但是麻醉效果卻很差。用作溶劑、有機(jī)合成的原料。用作色譜分析試劑、有機(jī)溶劑及尼龍66中間體。四氫呋喃又名一氧五環(huán)、氧雜環(huán)戊烷、四亞甲基氧，是合成農(nóng)藥苯丁錫的中間體，另外，可直接用于制合成纖維、合成樹脂、合成橡膠，也是許多聚合材料、精密磁帶和電鍍工業(yè)的溶劑，還用于制己二腈、己二酸、己二胺、丁二酸、丁二醇、γ-丁內(nèi)酯等，在醫(yī)藥工業(yè)上，可用于生產(chǎn)咳必清、黃體酮、利復(fù)霉素和用作制藥溶劑等。甲基四氫呋喃應(yīng)與氧化劑等分開存放，切忌混儲(chǔ)。連云港2-甲基四氫呋喃批發(fā)哪家好</p><p style="text-indent:25px">四氫呋喃中的過氧化物可用酸化的碘化鉀溶液來檢驗(yàn)。2-甲基四氫呋喃質(zhì)量</p><p style="text-indent:25px"> 共沸回收2-MeTHF的能耗比用精餾法回收THF的能耗低70%。 THF因沸點(diǎn)低，水溶性極好，損耗大，回收率低，回收成本高，三廢處理費(fèi)用高。長(zhǎng)期使用2-MeTHF綜合成本比使用THF低。 2-甲基四氫呋喃沸點(diǎn)較高,容易冷凝回收,揮發(fā)損失少,大氣污染小；在水中溶解度小,通過共沸精餾后回收率高,進(jìn)入廢水中的2-甲基四氫呋喃含量低,容易處理。 **、四氫呋喃、鹵代烷和苯等環(huán)境不友好的溶劑每年消耗量超過幾十萬(wàn)噸，其中作為格氏反應(yīng)溶劑的**和四氫呋喃每年用量在萬(wàn)噸以上。用2-甲基四氫呋喃替代上述環(huán)境不友好的溶劑符合綠色化工技術(shù)的要求，而且市場(chǎng)前景十分廣闊，經(jīng)濟(jì)和社會(huì)效益十分明顯。2-甲基四氫呋喃質(zhì)量</p><p style="text-indent:25px">上海蔚云化工有限公司位于靜安區(qū)靈石路709號(hào)55幢A2113室。公司業(yè)務(wù)分為環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺等，目前不斷進(jìn)行創(chuàng)新和服務(wù)改進(jìn)，為客戶提供良好的產(chǎn)品和服務(wù)。公司注重以質(zhì)量為中心，以服務(wù)為理念，秉持誠(chéng)信為本的理念，打造化工良好品牌。上海蔚云化工秉承“客戶為尊、服務(wù)為榮、創(chuàng)意為先、技術(shù)為實(shí)”的經(jīng)營(yíng)理念，全力打造公司的重點(diǎn)競(jìng)爭(zhēng)力。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2783172.html</p></div></div></div></div></div><div id="722uly8" class="page-right twoColRt"><div id="80n4moa" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="qkheacj" 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(qiáng) 信息推薦自業(yè)物資供應(yīng)" 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