甲基

In this paper, through a series of experiments, two series of quaternary-ammounium Gemini surfactants were synthesized, namely the pair alkylene double quaternary ammonium salt surfactant m-s-m·2Br and the pair the alkylene double quaternary ammonium salt surfactant -s-·2Br. We has carried on the attribute with the infrared spectrum to its structure, and to affected the factor which the synthesis pair the alkylene double quaternary ammonium salt surfactant responded to carry on the discussion. We has discovered the synthesis pair the ethylene double quaternary ammonium salt surfactant m-2-m·2Br optimum condition: The bromo alkane and a tetramethyl ethylene diamine mole of ratio is 3.0: 1.0, makes the solvent by the ethyl alcohol, 80℃ under responds for 48 hours in the backflow temperature; Synthesis pair alkylene double quaternary ammonium salt surfactant 12-S-12 ·2Br optimum condition: 12 tertiary amine and 1, 3- propylene dibromide (1, 4- two bromines butane) a mole of ratio is 2.2: 1.0, makes the solvent by the ethyl alcohol, responds for 48 hours in the constant temperature 80 ℃ under backflow.

本文通过一系列的实验，合成了两个系列的Gemini型表面活性剂，即双烷撑双季铵盐表面活性剂m-s-m·2Br和双烷撑双季铵盐表面活性剂-s-·2Br，用红外光谱对其结构进行了表征，并且对影响合成双烷撑双季铵盐表面活性剂反应的因素进行了讨论，找出了合成双乙撑双季铵盐表面活性剂m-2-m·2Br的最佳条件：溴代烷与四甲基乙二胺的摩尔比为3.0：1.0，以乙醇作溶剂，在回流温度80℃下反应48小时；合成双烷撑双季铵盐表面活性剂12-s-12·2Br的最佳条件：十二叔胺与1，3-二溴丙烷(1，4-二溴丁烷)摩尔比为2.2：1.0，以乙醇作溶剂，在恒温80℃下回流反应48小时。

The products are methyl vinyl ether (cis- and trans-), allyl alcohol and propen-2-ol.

计算得到的丙酮分子的5个异构化反应通道分别对应3种异构化产物，乙烯甲基醚、丙烯醇和1-丙烯-2羟基。

The influence of reaction temperature and time to production rate of tertiary amine was discussed;and the infrared attribute to Dimethyl ammonium allyl chloride was also carried out.

讨论了反应温度和时间间隔对叔胺产率的影响，并对二甲基二烯丙基氯化铵进行了红外表征。

A mild and highly efficient ZnCl2-catalyzed direct alkylation of active methylene compounds with benzylic and allylic alcohols has been reported.

报道了ZnCl2催化的活泼亚甲基化合物和苄醇或烯丙醇的直接烷基化反应。

The results show that flotation separation rutile and almandine can be realized by using alkyl-imino-bismethylene phosphoric acid (ATF1024) as a collector and (NaPO3)6 as a regulator.

结果表明，以烷胺双甲基磷酸(ATF1024)为捕收剂，六偏磷酸钠[(NaPO3)6]为调整剂，可以实现金红石与石榴石之间的浮选分离。

Objective:To explore the cardiac toxicity in rats exposed to aluminum chloride(AlCl3),and the inhibition of 1,2-dimethyl-3-hydroxy-4-pyridone.

目的：研究氯化铝(AlCl_3)染毒对大鼠心脏的毒性及铝螯合剂1，2-二甲基-3-羟基-4-吡啶酮的保护作用。

ObjectiveTo explore cardiac toxicity in rats exposed to aluminum chloride (AlCl3), and to evaluate the protection of 1,2dimethyl3hydroxy4pyridone against toxicity.

目的研究氯化铝（AlCl3）染毒对大鼠的心脏毒性及铝螯合剂1，2二甲基3羟基4吡啶酮的保护作用。

Acrylonitrile or methacrylonitrile is hydrolyzed in a suitable aqueous reaction mixture by an enzyme catalyst characterised by a nitrile hydratase and amidase activity of Comamonas testosteroni 5-MGAM-4D, producing the corresponding acid.

在合适的含水反应混合物中通过催化剂使丙烯腈或甲基丙烯腈进行水解生产对应的酸，催化剂的特征在于具有睾丸酮假单胞菌5-MGAM-4D的腈水合酶和酰胺酶活性。

Polymerization of norbornene was carried out in the presence of a catalyst system consisting of amidogen substituted mono(η~5-cyclopentadienyl)titanium/methyl aluminoxane.

采用胺基取代单茂钛{Cp~*TiCl_2N[Si(CH_3)_3]_2}与甲基铝氧烷组成催化体系催化降冰片烯聚合，得到有一定结晶结构的、可溶的聚降冰片烯。

N,N-Dimethyl dodecylamine was synthesized with dodecyl amine, formic acid and formaldehyde as raw material in this article.

以十二胺、甲酸和甲醛为原料，合成了N，N-二甲基十二烷基叔胺。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。