环铵
- 与 环铵 相关的网络例句 [注:此内容来源于网络,仅供参考]
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Moreover, this kind of novel complexes can be transformed to the analogous complexes as the complex 41 by treatment using 〓Ce〓.
而且这类络合物还可以在硝酸铈铵的作用下重新生成与络合物41结构类似的在萘环上带有取代基的双铁络合物。
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Objective: To study the anti-inflammation and anti-pruritus effect of bencycloquidium bromide.
目的:初步研究苯环喹溴铵的抗炎止痒作用。
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Objective: To study the general pharmacological actions of bencycloquidium bromide.
目的:探讨一类新药苯环喹溴铵的一般药理作用。
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The influence of each condition on the reaction speed and yield was studied, and the optimal conditions were: the ratio of the amount of substance of aromatic amine and heptafluoro-isopropyl iodine was 1:1.1~1.5, the amount of substance of sodium dithionite, sodium bicarbonate, aniline compounds were respectively 1.1~1.3, the amount of substance of phase transfer catalyst TBAB and aniline compounds was 0.05~0.1, the concentration of aniline compound was 0.5~1.0 mol/L, reaction temperature was 10~20 ℃, and the solvent was aether.
最佳结果为:芳胺与七氟异丙基碘的物质的量比1:1.1~1.5,连二亚硫酸钠、碳酸氢钠与苯胺的物质的量分别为1.1~1.3,相转移催化剂四丁基溴化铵与苯胺的物质的量比在0.05~0.1,溶剂总用量使苯胺浓度在0.5~1.0 mol/L;反应温度10~20℃;溶剂采用乙醚。取代基供电子性越强,反应时间越短,产率越高;氨基的对位优先反应,氨基的邻位较难发生反应;且七氟异丙基总是优先取代在芳环电子云密度较高的位置上。
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This paper is studied on a new synthesis method of amino-modified organic silicone micro-emulsion of cationic style by one step with a silane-alkyl coupling,3-(2-aminoethyl)-aminopropyl methyl dimethoxy silane while opening-cyclo polymerization of the octa-methyl cyclo tetra siloxane,thus the optimal manufacturing conditions are determined by comparing test of their properties.
采用硅烷偶联剂氨乙基氨丙基甲基二甲氧基硅烷改性,八甲基环四硅氧烷开环聚合,探索一步合成阳离子型氨基改性有机硅微乳新方法,通过其性能测试得出其最佳工艺条件:反应温度:80℃,反应时间:3 h,十六烷基三甲基溴化铵用量:5%,脂肪醇聚氧乙烯醚用量:5%,预乳液滴加时间:2 h。
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Seven of them have not been reported.Their structures were confirmed by IR,~1HNMR,MS,and element analysis. 4.Meanwhile,the green methylation procedure of imides was developed by using dimethyl carbonate as methylation reagent.A series of imides,for example,phthalimide,3,4-dibromo-maleimide and succincide were used for substrates.The effects of DABCO(1,4-diazabicyclo [2.2.2]octane)and DBU(1,8-diazabicyclo[5.4.0]undec-7-ene)as a catalyst in this kind of reactions were investigated.2-Bromo-3-(1-methylindolyl-3-yl)-1-methyl-1H-pyrrole-2,5-dione was prepared by using dimethyl carbonate,which further expanded the use of dimethyl carbonate,as a green agent in organic synthesis.
在以硫酸二甲酯为甲基化试剂对3,4-二溴马来酰亚胺进行N-甲基化反应合成3,4-二溴-N-甲基马来酰亚胺的同时,以碳酸二甲酯为甲基化试剂,对3,4-二溴马来酰亚胺、邻苯二甲酰亚胺、琥珀酰亚胺等酰亚胺类化合物的N-甲基化反应进行了研究;考察了1,4-二氮杂双环[2.2.2]辛烷,1,8-二氮杂双环[5.4.0]十一碳-7-烯、碳酸钾和四丁基溴化铵等作为催化剂对碳酸二甲酯N-甲基化反应的反应时间和收率等的影响,并应用碳酸二甲酯为甲基化试剂,合成了N-甲基-3-溴-4-(1-甲基-吲哚-3)-马来酰亚胺。
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Chiral SalanCrX complexesa saturated version of SalenCr(ⅢX are designed,and in conjunction with an ionic quaternary ammonium salt or organic strong base can efficiently catalyze the asymmetric,regio-and stereoselective alternating copolymerization of CO_2 with rac-PO at mild conditions to afford isotactic-enriched polycarbonates with~95%head-to-tail linkages and moderate enantioselectivity.
本论文在Salen构型配体的基础上,设计合成了一系列手性Salan型铬配合物,并将其与季铵盐/有机强碱组成亲电-亲核双组分催化体系,在室温下可以有效的催化CO_2和环氧丙烷的不对称交替共聚反应,实现了CO_2和环氧丙烷的不对称交替共聚反应的区域和立体化学控制,得到95%的头尾连接单元和中等光学纯度(对映体过量值ee%≈70%)的全同结构的聚碳酸酯。
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ASpheric FeNi nanoparticles with average diameter of about 70 nm were obtained in the system of cetyltrimethyl ammonium bromide/H_2O,while most of the products were nanofilms/rods with the addition of cyclohexane; nearly monodisperse FeNi nanoparticles with average diameter of about 25 nm were prepared in the system of PEG/cyclohexane/H_2O.With the assistance of ultrasonic,a no-surfactant method to 8.5 nm FeCo nanocrystals with high Ms(>200.5 emu/g)has been developed with economical FeCl_3·6H_2O as iron sources.
a以水合肼为还原剂在十六烷基三甲基溴化铵/H_2O体系中得到了平均粒径约70 nm的FeNi合金球形颗粒,当在此体系中加入环己烷时样品主要形态为纳米膜/棒;于PEG/环己烷/H_2O体系中制备了单分散性较好的平均粒径约25 nm的FeNi合金纳米颗粒,合金纳米颗粒粒径随金属离子浓度减小而减小。
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In the previous work,a conformational rule was proposed for Hofmann elimination of quaternary ammonium hydroxides.
本文合成了12种含环戊基或环己基的第四级铵碱,使之发生Hofmann消除反应。
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The epoxidation can be performedwell when the concentration of quaternary ammoniumsaltand sodium tungstate is 0.06 mol/L and 0.03 mol/L, respectively.
结果表明,季铵盐和钨酸钠的浓度分别为0.06,0.03 mol/L时的催化效果最佳;α-和β-蒎烯的转化率随着H2O2与蒎烯的量比增大而增大,当H2O2与α-蒎烯和β-蒎烯的量比分别为2.0和1.8时,其转化率均可达到100%;较高的温度不利于环氧化反应的进行,因此,环氧化反应温度需控制在20℃以下。
- 推荐网络例句
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As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.
每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。
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Maybe they'll disappear into a pothole.
也许他们将在壶穴里消失
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But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.
但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。