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-bromothiophene
相关语句
  2-溴噻吩
     The best conditions of synthesizing of 2-bromothiophene by direct bromination are as follows: the temperature was controlled 80~90℃,the ratio of materials(bromine to thiophene) is 0.60∶1 and the time of adding bromine is(6 h)~(8 h).
     直接溴化法合成2-溴噻吩的最佳工艺条件是控制反应温度在80~90℃之间,原料配比(溴与噻吩物质的量之比)为0.60∶1,溴蒸气通入时间为6~8 h。
短句来源
     Synthesis research of intermediate 2-bromothiophene
     有机中间体2-溴噻吩的合成研究
短句来源
     The Synthesis of 2-Bromothiophene By Direct Bromination
     直接溴化法合成2-溴噻吩
短句来源
     Synthesis of 2-Bromothiophene using Glacial Acetic Acid as Solvent
     以冰乙酸为溶剂制备2-溴噻吩
短句来源
     2-bromothiophene was synthesized by the methods of direct bromination. A series of factors was investigated,which affected the direct bromination.
     用溴蒸气与液体噻吩进行直接溴化反应合成了2-溴噻吩,考察了一系列因素对直接溴化法生产2-溴噻吩工艺的影响。
短句来源
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  “2-bromothiophene”译为未确定词的双语例句
     Experimental results indicated when the bromine was added as gas into thiophene,the yiled of 2-bromothiophene was higher and there was little side production.
     实验结果表明:将溴蒸气预热后通入液体噻吩中进行反应产品产率较高,溴蒸气是否与稀释气体混和对产率影响不大;
短句来源
     When bromine was added as gas into thiophene,the yield of 2-bromothiophene is higher and there was little by-product.
     将溴以蒸汽状态通入液体噻吩中进行反应产率较高,且副产物最少.
短句来源
  相似匹配句对
     (2).
     (2)漂浮植物-凤眼莲虽然有很强的抑制浮游植物的作用,但是对浮游植物种群结构影响不大。
短句来源
     2).
     2)政府行政干预过度;
短句来源
     m~(-2).
     间作玉米光合速率平均为28.55μmol.m~(-2).s~(-1),比玉米单作提高了11.5%。
短句来源
     2-
     - 2-
短句来源
     The Synthesis of 2-Bromothiophene By Direct Bromination
     直接溴化法合成2-溴噻吩
短句来源
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  -bromothiophene
The reaction of KBrO3 with thiophene in the presence of HBr in a two-phase water-ether system permits obtaining 2-bromothiophene, not contaminated with 2,5-dibromothiophene, in high yield.
      


The reaction of thiophene with pyridine hydrobromide perbromide(C 5H 5NHB r·Br 2) in 48% hydlrobromic acid and tetrachloromethane gives 2bromothiophene in 90% yield. That reaction character is of short reaction period time. high selectivity and moderate reaction condition.

噻吩用过溴吡啶氢酸盐在四氯化碳和48%氢溴酸中进行选择性溴化,可得到98%的2溴噻吩.该反应时间短,收率高,选择性好,操作方便,是噻吩单溴化又一新方法.

thienyl boronic acid,di(2 thienyl)borinic acid,tri(2 thienyl) borane and their deriverates were prepared by one pot reaction between 2 bromothiophene,magnesium and boron trifluoride ether or tributyl borate at room temperature .5 Methyl 2 furanyl and 2 benzofuranyl boron compounds were obtained from the corresponding lithium reagents reacting with borontrifluoride ether or tributylborate at lower temperature.

利用2-溴噻吩、镁屑、硼酸三正丁酯或三氟化硼乙醚室温下一锅反应分别合成了一噻吩基、二噻吩基硼酸,三噻吩基硼烷及其衍生物.利用5-甲基-2-呋喃基锂、2-苯并呋喃基锂与硼酸三正丁酯或三氟化硼乙醚低温下反应合成了几种含呋喃基硼化合物.利用烃基格氏试剂与噻吩基硼酸正丁酯低温下反应合成噻吩基烃基硼酸衍生物

The derivatives of thiophene heterocyclics have most wide applications. In China, there are no producers having large-scale output and serialized products yet. Most compounds of this kind are va- cant and development of thiophene compounds is still in its beginning sta- ges. Thiophene derivatives substituted at a position are used in synthesis of pharmaceuticals, pesticides, dyestuffs, chemical reagents and auxilia- ries for high polymers. The important derivatives include thiophene-α- acetic acid, α-chloromethylthiophene,...

The derivatives of thiophene heterocyclics have most wide applications. In China, there are no producers having large-scale output and serialized products yet. Most compounds of this kind are va- cant and development of thiophene compounds is still in its beginning sta- ges. Thiophene derivatives substituted at a position are used in synthesis of pharmaceuticals, pesticides, dyestuffs, chemical reagents and auxilia- ries for high polymers. The important derivatives include thiophene-α- acetic acid, α-chloromethylthiophene, α-acetylthiophene and thiophene- α-formaldehyde. Thiophene-α-acetic acid has a largest consumption a- mount in thiophene derivaties with a margin of about 1000t/a. Thiophene derivatives substituted at β position exhibit special activities, they are mainly used for synthesizing pharmaceuticals and pesticides. Most β posi- tion substituted derivatives of thiophene are produced based on β-thiotolu- ene, the important derivatives include β-thiotoluene, β-thiopheneformal- dehyde, ethyl-β-thiophene acetate and β-bromothiophene. Derivatives of β position substituted thiophene are high value-added products, for exam- ple, price of β-thiopheneformaldehyde is 860000 yuan/t, and 2-(o-ni-troanilino)-5-methyl-β-cyanothiophene is 12000 yuan/kg.

噻吩类杂环化合物应用较多的是其衍生物,该类化合物发展在我国处在起步阶段,大多数产品尚属空白,还没有产量规模化、品种系列化的生产厂家。α-噻吩衍生物广泛应用于合成医药、农药、染料、化学试剂和高分子助剂等,重要的衍生物有噻吩-α-乙酸、α-氯甲基噻吩、α-乙酰噻吩和噻吩-α-甲醛,噻吩-α-乙酸是目前用量最大的噻吩衍生物,全球用量在1000t/a左右。β-噻吩衍生物有特殊的活性,主要用于合成医药和农药。大多数β-噻吩衍生物是以β-甲基噻吩为原料合成的,重要的衍生物有β-甲基噻吩、β-噻吩甲醛、噻吩-β-乙酸乙酯和β-溴噻吩等,β-噻吩衍生物是高附加值产品,例如β-噻吩甲醛的售价为86万元/t,2-(邻硝基苯胺基)-5-甲基-β-氰基噻吩的售价为1.2万元/kg。

 
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