揚(yáng)州2-甲基四氫呋喃批發(fā)公司上海蔚云化工供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺(tái)【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="甲基效應(yīng)在藥物化學(xué)中眾所周知，然而對(duì)于藥物分子的后期修仍具有一定的挑戰(zhàn)。通過鈷催化劑，實(shí)現(xiàn)了對(duì)復(fù)雜藥物分子后期的C-H甲基化反應(yīng)。依賴于硼的甲基化試劑，同時(shí)利用分子內(nèi)在的導(dǎo)向基團(tuán)來活化C-H鍵，揚(yáng)州2-甲基四氫呋喃批發(fā)公司，該反應(yīng)具有普遍的"><meta name="keywords" content="揚(yáng)州2-甲基四氫呋喃批發(fā)公司,2-甲基四氫呋喃"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" 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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>揚(yáng)州2-甲基四氫呋喃批發(fā)公司,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-10-30 02:21:59</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="clnkb7w" 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="j3yfhog" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="ox2w9ax" class="box"><p><p style="text-indent:25px">甲基效應(yīng)在藥物化學(xué)中眾所周知，然而對(duì)于藥物分子的后期修仍具有一定的挑戰(zhàn)。通過鈷催化劑，實(shí)現(xiàn)了對(duì)復(fù)雜藥物分子后期的C-H甲基化反應(yīng)。依賴于硼的甲基化試劑，同時(shí)利用分子內(nèi)在的導(dǎo)向基團(tuán)來活化C-H鍵，揚(yáng)州2-甲基四氫呋喃批發(fā)公司，該反應(yīng)具有普遍的適用性。此外，該反應(yīng)無需預(yù)功能化或后脫保護(hù)，揚(yáng)州2-甲基四氫呋喃批發(fā)公司，即可對(duì)各種市售藥物分子和天然產(chǎn)物進(jìn)行甲基化。同時(shí)，理化性質(zhì)和生物學(xué)測(cè)試也證實(shí)了這種看似微小的結(jié)構(gòu)變化，會(huì)影響重要的藥物特性。在藥物開發(fā)中，后期官能團(tuán)化或后期修飾至關(guān)重要。這種策略可直接對(duì)生物活性分子進(jìn)行結(jié)構(gòu)多樣化修飾，從而避免從頭合成，并迅速獲得目標(biāo)產(chǎn)物，揚(yáng)州2-甲基四氫呋喃批發(fā)公司。過渡態(tài)金屬催化的特定位置C-H活化，已實(shí)現(xiàn)在復(fù)雜分子上引入體積較小的官能團(tuán)（如氟、氰基、胺或者短鏈烷烴）。而在藥物結(jié)構(gòu)中，C-H鍵上的氫被甲基取代后，有助于提高藥物的結(jié)合親和力、生物利用度、代謝穩(wěn)定性，改變藥物的藥代動(dòng)力學(xué)，從而被藥物化學(xué)家稱為“神奇的甲基效應(yīng)”或者“魔幻的甲基效應(yīng)”。2-甲基四氫呋喃可替代苯、甲苯、氯仿等溶劑。揚(yáng)州2-甲基四氫呋喃批發(fā)公司</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="揚(yáng)州2-甲基四氫呋喃批發(fā)公司,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png"></div><p style="text-indent:25px">四氫呋喃THF主要用作生產(chǎn)原料和溶劑，但是它卻是在世界衛(wèi)生組織國際ai癥研究機(jī)構(gòu)公布的致ai物清單初步整理參考中，四氫呋喃在2B類致ai物清單中。四氫呋喃，是一個(gè)雜環(huán)有機(jī)化合物。屬于醚類，是芳香族化合物呋喃的完全氫化產(chǎn)物，是一種無色、可與水混溶、在常溫常壓下有較小粘稠度的有機(jī)液體。對(duì)于它的檢測(cè)，除了使用氣體檢測(cè)儀，我們還可以使用GASTEC四氫呋喃檢測(cè)管來快速且精確地檢測(cè)。四氫呋喃檢測(cè)管在使用時(shí)只需配備上GASTEC的手泵即可簡(jiǎn)單的完成檢測(cè)，氣體檢測(cè)管法作為一種簡(jiǎn)單、快速、直讀的檢測(cè)方法，具有其獨(dú)特的優(yōu)勢(shì)，在很多國家，檢測(cè)管法作為精密檢測(cè)方法的一種補(bǔ)充，得到了普遍的應(yīng)用。這款四氫呋喃氣體檢測(cè)管檢測(cè)快速，檢測(cè)結(jié)果較準(zhǔn)可靠。2-甲基四氫呋喃生產(chǎn)工藝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="揚(yáng)州2-甲基四氫呋喃批發(fā)公司,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png"></div><p style="text-indent:25px">聚四亞甲基醚二醇，又稱聚(四氫呋喃)，簡(jiǎn)稱PTMEG，是一種重要的高分子材料，用途十分普遍。氨綸工業(yè)PTMEG的主要領(lǐng)域是氨綸工業(yè)。氨綸是一種性能優(yōu)良的彈性纖維，主要用于生產(chǎn)內(nèi)衣、泳衣、運(yùn)動(dòng)裝和襪類。彈性體由PTMEG合成的聚氨酯，具有抗水解、耐老化、彈性好、耐磨等優(yōu)點(diǎn)，是特種橡膠的原料，可以用來制作航空軟管、升降機(jī)輪胎、工業(yè)膠帶、運(yùn)動(dòng)鞋、醫(yī)用假體等。其他領(lǐng)域PTMEG具有強(qiáng)度高、彈性好、耐霉變等優(yōu)點(diǎn)，也可以用于合成革制品、輪胎、傳送帶、建筑涂料和地板，以及防護(hù)材料等領(lǐng)域的生產(chǎn)。</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)。四氫呋喃是一種重要的有機(jī)合成原料且是性能優(yōu)良的溶劑。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="揚(yáng)州2-甲基四氫呋喃批發(fā)公司,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624124322657/6802327.png"></div><p style="text-indent:25px">四氫呋喃是一種重要的有機(jī)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(yīng)溶劑，用于電鍍鋁液時(shí)可任意控制鋁層厚度且光亮。四氫呋喃自身可縮聚成聚四亞甲基醚二醇，也稱四氫呋喃均聚醚。PTMEG與甲苯二異氰酸酯制成耐磨、耐油、低溫性能好、強(qiáng)度高的特種橡膠；與對(duì)苯二甲酸二甲酯和1,4-丁二醇制成嵌段聚醚聚酯彈性材料。相對(duì)分子質(zhì)量為2000的PTMEG與對(duì)亞甲基雙二異氰酸酯制成聚氨酯彈性纖維、特種橡膠和一些特殊用途涂料的原料。在有機(jī)合成方面，用于生產(chǎn)四氫噻吩、1.2-二氯乙烷、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。THF還可用做合成革的表面處理劑。呋喃類是一類化學(xué)合成藥。衢州2-甲基四氫呋喃工藝</p><p style="text-indent:25px">四氫呋喃具有低毒、低沸點(diǎn)、流動(dòng)性好等特點(diǎn)。揚(yáng)州2-甲基四氫呋喃批發(fā)公司</p><p style="text-indent:25px"> 鈀催化硅試劑與鹵化物的偶聯(lián) 反應(yīng) C-N鍵形成的偶聯(lián) 反應(yīng) 酮的α-芳基化反應(yīng) 鈀催化的烯丙基類化合物的反應(yīng)兩相反應(yīng)的溶劑，MeTHF是非常有效的兩相反應(yīng)溶劑，特別是在氫氧化鈉水溶液中進(jìn)行的烷基化、酰胺化和親核取代反應(yīng)。MeTHF 作為兩相反應(yīng)的溶劑，不僅反應(yīng)易進(jìn)行，而且分層界面清晰。由于MeTHF作溶劑時(shí)，產(chǎn)品分離回收更方便，因而常用作還原胺化和胺的?；磻?yīng)溶劑。極易揮發(fā)，通常都有大量損失；致ai物質(zhì)；鹵代烷是嚴(yán)格受限制的化學(xué)品。 4.5 2-MeTHF－鹵代烷的優(yōu)良替代品鹵代烷的缺點(diǎn)： 2-MeTHF相對(duì)于CH2Cl2的優(yōu)越性與水微溶，回收方便；對(duì)溶解在DCM中的極性化合物具有很強(qiáng)的溶解性。揚(yáng)州2-甲基四氫呋喃批發(fā)公司</p><p style="text-indent:25px">上海蔚云化工有限公司專注技術(shù)創(chuàng)新和產(chǎn)品研發(fā)，發(fā)展規(guī)模團(tuán)隊(duì)不斷壯大。公司目前擁有專業(yè)的技術(shù)員工，為員工提供廣闊的發(fā)展平臺(tái)與成長(zhǎng)空間，為客戶提供高質(zhì)的產(chǎn)品服務(wù)，深受員工與客戶好評(píng)。上海蔚云化工有限公司主營(yíng)業(yè)務(wù)涵蓋環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺，堅(jiān)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。公司力求給客戶提供全數(shù)良好服務(wù)，我們相信誠實(shí)正直、開拓進(jìn)取地為公司發(fā)展做正確的事情，將為公司和個(gè)人帶來共同的利益和進(jìn)步。經(jīng)過幾年的發(fā)展，已成為環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺行業(yè)出名企業(yè)。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1765737.html</p></div></div></div></div></div><div id="icebdkm" class="page-right twoColRt"><div id="8ykhjvh" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="dx8mbsj" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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