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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>舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-11-17 05:23:05</p><p><span id="click" >瀏覽次數(shù)：3次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="mvxtaco" 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="hbsu78c" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="87wy7aw" class="box"><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(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(jiàn)的氮雜環(huán)（3a–3e）或者酰胺基團(tuán)（3f–3p），舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜，均與體系兼容，舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜。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(méi)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(jiàn)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，舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜，可以選擇性的在1-位甲基化。然而，酯和羧酸不適用該體系。四氫呋喃可用作溶劑、有機(jī)合成的原料。舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624097545321/7454619.png"></div><p style="text-indent:25px">四氫呋喃是一種重要的有機(jī)化工及精細(xì)化工原料，普遍應(yīng)用于樹(shù)脂溶劑（磁帶涂層、PVC表面涂層、清洗PVC反應(yīng)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(yīng)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(jī)聚合物）；化學(xué)中間產(chǎn)物（聚合生成PTMEG、天然氣加味劑）；色譜溶劑（凝膠滲透色譜法）。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。由平均分子量為1000的聚四氫呋喃制得的嵌段聚氨酯橡膠，可用作輪胎、傳動(dòng)帶、墊圈等;也可用于涂料、人造革、薄膜等。制得的嵌段聚醚聚酯為熱塑性彈性體。平均分子量為2000的聚四氫呋喃，可用以制聚氨酯彈性纖維。由聚四氫呋喃制成的嵌段聚氨酯具有良好的抗凝血性，可用作醫(yī)用高分子材料。南京2-甲基四氫呋喃哪里便宜甲基和DNA結(jié)合過(guò)程叫甲基化。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624164107853/4550822.png"></div><p style="text-indent:25px">堿和過(guò)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(guò)渡態(tài)金屬催化過(guò)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(guò)碳酸銀氧化為Co(Ⅲ)，從而完成催化循環(huán)。</p><p style="text-indent:25px">與氧化劑接觸猛烈反應(yīng)。流速過(guò)快,容易產(chǎn)生和積聚靜電。其蒸氣比空氣重,能在較低處擴(kuò)散到相當(dāng)遠(yuǎn)的地方,你好四氫糠醇和溴化氫能反應(yīng)，能生成2-溴甲基四氫呋喃。你好四氫糠醇和溴化氫能反應(yīng)，能生成2-溴甲基四氫呋喃。這是因?yàn)樗臍淇反季哂胁嫉幕瘜W(xué)性質(zhì)，所以可以和溴化氫通過(guò)雙分子親核取代機(jī)制(SN2)反應(yīng)生成2-溴甲基四氫呋喃。四氫呋喃極性強(qiáng)四氫呋喃是一類雜環(huán)有機(jī)化合物。它是強(qiáng)的極性醚類之一,半數(shù)致死量：二甲亞砜（大鼠，經(jīng)口）17.9ml/經(jīng)口)7.6ml/kg，四氫呋喃(大鼠,如極性分子與非極性分子之間一般不能互溶。（有時(shí)要看看有沒(méi)有溶劑化作用，如溴是非極性分子，水是極性分子，除了反應(yīng)還有溶劑化作用。）組成這兩種物質(zhì)的化學(xué)鍵是否相同。甲基四氫呋喃是作為綠色溶劑替代四氫呋喃的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623894254288/5270430.png"></div><p style="text-indent:25px">2-甲基四氫呋喃是一種有機(jī)化合物，分子式是C5H10O。外觀與性狀：透明,無(wú)色液體，密度：0.86 g/mL at 25 °C。熔點(diǎn)：-136 °C 凝固點(diǎn)：-136℃。沸點(diǎn)：78-80 °C，折射率：n** 1.406。儲(chǔ)存條件：庫(kù)房通風(fēng)低溫干燥,與氧化劑、酸類分開(kāi)存放。由2-甲基呋喃催化加氫而得。當(dāng)催化加氫反應(yīng)采用氯化鈀催化劑時(shí),主要的產(chǎn)品是乙酰丙醇(見(jiàn)00420),但也可回收得到副產(chǎn)品2-甲基四氫呋喃。本品主要用作樹(shù)脂、橡膠、乙基纖維素等的溶劑；用它提取脂肪族酸類，要比一般所用的低沸點(diǎn)溶劑好，在鈾的冶煉工業(yè)上也相當(dāng)重要。在制藥工業(yè)中可合成抗痔藥磷酸伯氨奎、磷酸氯喹等。四氫呋喃又名一氧五環(huán)、氧雜環(huán)戊烷、四亞甲基氧。南京2-甲基四氫呋喃哪里便宜</p><p style="text-indent:25px">四氫呋喃用作色譜分析試劑、有機(jī)溶劑及尼龍66中間體。舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜</p><p style="text-indent:25px">2-甲基四氫呋喃與其它溶劑相比，MeTHF用作格氏反應(yīng)溶劑具有如下優(yōu)點(diǎn)：與水互溶性小，產(chǎn)品回收相對(duì)比較容易；與THF相比，易于脫水，回收利用方便、成本低；與THF相比，分層界面清晰；特別適用于制備高濃度的溴格氏試劑溶液；獲得高收率的芐基或烯丙基格氏試劑；可在較高溫度下反應(yīng)，且溶劑損耗小。在制藥工業(yè)上的應(yīng)用在化妝品工業(yè)上的應(yīng)用在農(nóng)藥領(lǐng)域的應(yīng)用。芳樟醇/香酮是香水香精、家化產(chǎn)品香精及皂用香精配方中使用頻率較高的香料品種，現(xiàn)在全世界的年用量達(dá)一萬(wàn)多噸，同時(shí)也是合成異植物醇、VE、VK的原料。 THF與水互溶，回收低水份的THF，需要特殊的設(shè)備和較高的能耗費(fèi)用。 2-MeTHF與水的溶解性有限，通過(guò)簡(jiǎn)單的間歇共沸脫水精餾操作，就可以回收水份低于300ppm的2-MeTHF，實(shí)現(xiàn)循環(huán)使用。舟山2-甲基四氫呋喃生產(chǎn)廠家排行榜</p><p style="text-indent:25px">上海蔚云化工有限公司辦公設(shè)施齊全，辦公環(huán)境優(yōu)越，為員工打造良好的辦公環(huán)境。專業(yè)的團(tuán)隊(duì)大多數(shù)員工都有多年工作經(jīng)驗(yàn)，熟悉行業(yè)專業(yè)知識(shí)技能，致力于發(fā)展巴斯夫陶氏的品牌。公司不**提供專業(yè)的化工產(chǎn)品（除危險(xiǎn)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(jī)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(kāi)發(fā)、技術(shù)轉(zhuǎn)讓、技術(shù)服務(wù)、技術(shù)咨詢。【依法須經(jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】，同時(shí)還建立了完善的售后服務(wù)體系，為客戶提供良好的產(chǎn)品和服務(wù)。自公司成立以來(lái)，一直秉承“以質(zhì)量求生存，以信譽(yù)求發(fā)展”的經(jīng)營(yíng)理念，始終堅(jiān)持以客戶的需求和滿意為重點(diǎn)，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，從而使公司不斷發(fā)展壯大。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2024085.html</p></div></div></div></div></div><div id="txe2nub" class="page-right twoColRt"><div id="qpmxwhj" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="2xopriz" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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