查询词典 hexamethylenetetramine

Methods 4-Hydroxy- benzonitrile was treated with sodium hydrogen sulfide and anhydrous magnesium chloride in dimethyl formamide to give thioamide, which was then directly cyclized with ethyl 2-chloroacetoacetate without separation to give ethyl 2-(4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(2) in one-pot; then 2 was formylated with Duff reaction adopting hexamethylenetetramine in trifluoroacetic acid to give ethyl 2-(3-formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(3); finally, the target compound was obtained by the treatment of 3 with hydroxylamine hydrochloride and sodium formate in formic acid.

采用"一勺烩"方法，以4-羟基苯甲腈为起始原料，首先与硫氢化钠和无水氯化镁在N，N-二甲基甲酰胺中反应，所得中间体不经分离，直接加入2-氯乙酰乙酸乙酯进行环合反应，得到2-(4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（2）；然后通过六亚甲基四胺/三氟乙酸进行Duff反应，得到2-(3-甲酰基-4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（3）；再经盐酸羟胺/甲酸/甲酸钠体系脱水得到目标化合物。

The corrosion inhibiting ability of sodium dodecyl benzene sulfonate and hexamethylenetetramine as additives are also studied.

结果表明：在KOH溶液中，镁合金保持强烈的惰性，镁合金在其中放电困难。

It is indicated that the acetate anion and the weak organic alkali hexamethylenetetramine play the critical role in the formation of the layered precursors at the beginning of the process.

结果表明，在上述反应中醋酸根阴离子和弱有机碱六次甲基四胺对前驱体和ZnO纳米带的形成起了关键作用。

The inhibiting ability of hexamethylenetetramine to AZ31 magnesium alloy was studied by linear sweep voltammetry and electrochemical impedance spectroscopy.

为了表征六次甲基四胺对AZ31镁合金在MgSO4溶液中的缓蚀性能，用线性电位扫描、电化学阻抗谱等方法研究了合金在溶液中的电化学行为。

A three-dimensional supramolecular compound 〓 8, where hmt stands for hexamethylenetetramine, was synthesized and characterized by IR, crystal structure.

化合物7是一个相邻平面结构通过氢键连接而成的三维超分子化合物。

The adsorption of hexamethylenetetramine on the MS surface in hydrochloric acid was found to obey Temkin's adsorption isotherm.

在盐酸酸洗液中添加HMTA抑制剂对碳钢表面吸附作用遵循Temkin'S等温吸附模式。

Using Hexamethylenetetramine as the catalyst and P-Hydroxyanisole as the inhibitor, glycidyl methacrylate were prepared by two-step method successfully.

本论文以六次甲基四胺为催化剂，对羟基苯甲醚为阻聚剂，采用酯化闭环两步法制备出甲基丙烯酸缩水甘油酯。

In Chapter 4, eight two- and three-dimensional non-interpenetrating open-networks having diverse sizes and shapes have been constructed with a potential tetradendate ligand hexamethylenetetramine and characterized by X-ray single-crystal structural analysis.

第四章描述了包括第一例由 m 4-hmt 配体形成的二维网络结构（配合物20）在内的八种具有各种形状的孔穴或通道的二、三维非穿插网络配合物的构筑与晶体结构。

With the addition of hexamethylenetetramine, an ambient pressure drying technique was developed for the fabrication of resorcinol-formaldehyde-based carbon aerogels.

以间苯二酚和甲醛为反应物、六次甲基四胺HMTA为催化剂、去离子水为溶剂，所合成的间苯二酚－甲醛凝胶能够在常压条件下直接进行干燥得到有机气凝胶；并经炭化，得到炭气凝胶。

ZnO nanorings were prepared on a large scale by a facile solution-based method at 70 ℃ for 5 h via hexamethylenetetramine(C6H12N4) and Zn(NO3)2·2H2O as the raw materials in the presence of surfactant PAM-CTAC.

以六次甲基四胺(Hexamethylenetetramine， C6H12N4)和水合硝酸锌[Zn(NO3)2·2H2O]为原料，表面活性剂聚丙烯酰胺-氯化二烯丙基二甲基铵为形貌控制剂，采用液相沉淀法合成了ZnO纳米环。

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。