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class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624164107853/4550822.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="eb8pje3" 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>上海2-甲基四氫呋喃報價,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-11-17 07:22:27</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="ipalwgy" 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(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="gto8kee" class="page-proshow02"><p class="title">詳細說明</p><div id="svb3v8h" class="box"><p><p style="text-indent:25px">應(yīng)用實例：鹽酸曲馬多合成中的應(yīng)用鹽酸曲馬多，在抗HIV藥替普那韋合成中的應(yīng)用替普那韋，上海2-甲基四氫呋喃報價，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(yīng)用馬來酸依那普利，在抗***藥氟康唑合成中的應(yīng)用氟康唑，在抗藥三尖杉酯堿合成中的應(yīng)用，在抗抑郁藥鹽酸安非他酮合成中的應(yīng)用芳樟醇芳香酮，在芳樟醇/香酮合成中的應(yīng)用，在農(nóng)藥草銨膦合成中的應(yīng)用，在聯(lián)苯醇的合成中應(yīng)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(yīng)。在有機鋰化學(xué)中，上海2-甲基四氫呋喃報價，使用MeTHF作溶劑與THF相比，不僅分離方便，上海2-甲基四氫呋喃報價，而且所得的鋰。四氫呋喃分子在常溫常壓下有較小粘稠度的有機液體。上海2-甲基四氫呋喃報價</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海2-甲基四氫呋喃報價,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624164107853/4550822.png"></div><p style="text-indent:25px">隨著分子遺傳學(xué)的發(fā)展，生物甲基化和微生物抗汞的生態(tài)學(xué)研究已推向分子水平，近年來開展了微生物轉(zhuǎn)化汞的遺傳控制研究。細菌的抗汞性能受遺傳質(zhì)粒和染色體的調(diào)節(jié)和控制，某些具有抗汞性的細菌質(zhì)粒有移位的潛力，使不具有抗性的細菌細胞獲得抗性。這將進一步闡明底泥中細菌能使汞遷移轉(zhuǎn)化和使廢料中汞實行再循環(huán)的基礎(chǔ)。為了提高微生物的抗汞能力，有的學(xué)者已應(yīng)用質(zhì)體轉(zhuǎn)移新技術(shù)得到新的質(zhì)粒（MER質(zhì)粒）,細菌具有這種新質(zhì)粒，抗汞能力可提高40倍左右。上海2-甲基四氫呋喃報價2-甲基四氫呋喃是一種有機化合物，分子式是C5H10O。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海2-甲基四氫呋喃報價,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624283199578/5832986.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(shè)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(yīng)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(yīng)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(yīng)物料低溫，攪拌下加入定量的水，升溫至70～90℃，蒸出未反應(yīng)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。</p><p style="text-indent:25px">THF自身可縮聚（經(jīng)陽離子引發(fā)開環(huán)再聚合）成聚四亞甲基醚二醇（PTMEG），也稱四氫呋喃均聚醚。PTMEG與甲苯二異氰酸酯（TDI）制成耐磨、耐油、低溫性能好、強度高的特種橡膠；與對苯二甲酸二甲酯和1,4-丁二醇制成嵌段聚醚聚酯彈性Chemicalbook材料。相對分子質(zhì)量為2000的PTMEG與對亞甲基雙（4-苯基）二異氰酸酯（MDI）制成聚氨酯彈性纖維（氨綸，即SPANDEX纖維）、特種橡膠和一些特殊用途涂料的原料。在有機合成方面，用于生產(chǎn)四氫噻吩、1.4-二氯乙烷、2.3-二氯四氫呋喃、戊內(nèi)酯、丁內(nèi)酯和吡咯烷酮等。在醫(yī)藥工業(yè)方面，THF用于合成咳必清、利復(fù)霉素、黃體酮和一些藥。THF經(jīng)硫化氫處理生成四氫硫酚，可作燃料氣中的臭味劑（識別添加劑）。THF還可用做合成革的表面處理劑。THF經(jīng)硫化氫處理生成四氫硫酚，可作燃料氣中的臭味劑。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海2-甲基四氫呋喃報價,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624124322657/6802327.png"></div><p style="text-indent:25px">四氫呋喃性狀：無色液體，有與醚類似的氣味。能與水和有機溶劑相混溶，易燃。四氫呋喃在強氧化劑高錳酸鉀的作用下會發(fā)生反應(yīng)生成丁二酸；檢測殘留四氫呋喃的方法感覺用儀器分析，如氣、液相色譜；四氫呋喃是一種性質(zhì)比較穩(wěn)定的常用的有機溶劑，也可用于化工產(chǎn)品生產(chǎn)原料。四氫呋喃的沸點是分子量72.11相對dao密度（du20℃/4℃dao）0.8892凝固點/℃-108.5沸點/℃65.4閃點（閉口）/℃17.2折光率（20℃）1.407介電常回數(shù)（25℃）7.58偶極矩/(10^-30C·答m)5.70,5.67表面張力/(mN/m)26.4黏度(20℃)/mPa·s0.55臨界溫度/℃26.8臨界壓力/MPa5.19蒸氣壓(15℃)/kPa15.2 蒸氣相對密度（空氣=1）2.5燃點/℃321.1蒸發(fā)熱(66℃)/(KJ/Kg)410極限/%(體積)2.3-11.8較小引燃能量/mJ0.5。四氫呋喃是一種重要的有機化工及精細化工原料。上海2-甲基四氫呋喃報價</p><p style="text-indent:25px">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。上海2-甲基四氫呋喃報價</p><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）。對底物范圍進行了擴展。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（3f–3p），均與體系兼容。一級酰胺由于缺乏導(dǎo)向基團，從而導(dǎo)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(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。上海2-甲基四氫呋喃報價</p><p style="text-indent:25px">上海蔚云化工有限公司坐落在靜安區(qū)靈石路709號55幢A2113室，是一家專業(yè)的化工產(chǎn)品（除危險化學(xué)品、監(jiān)控化學(xué)品、煙花爆竹、民用物品、易制毒化學(xué)品）、化工機械設(shè)備及配件的銷售，在化工技術(shù)領(lǐng)域內(nèi)從事技術(shù)開發(fā)、技術(shù)轉(zhuǎn)讓、技術(shù)服務(wù)、技術(shù)咨詢?！疽婪毥?jīng)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(jīng)營活動】公司。一批專業(yè)的技術(shù)團隊，是實現(xiàn)企業(yè)戰(zhàn)略目標的基礎(chǔ)，是企業(yè)持續(xù)發(fā)展的動力。上海蔚云化工有限公司主營業(yè)務(wù)涵蓋環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺，堅持“質(zhì)量保證、良好服務(wù)、顧客滿意”的質(zhì)量方針，贏得廣大客戶的支持和信賴。公司深耕環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺，正積蓄著更大的能量，向更廣闊的空間、更寬泛的領(lǐng)域拓展。</p></p><br /><p>文章來源地址: 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