中间体

The condensation reaction,in which the yield of intermediate product after refining process was more than 90%,used iso-butylaldehyde and formaldehyde as materials,Et 3N as catalyst.The hydrogenation,in which the conversion of hydroxypivaldehyde and selectivity of NPG were respectively 99% and 95%,used Cu-ZnO as catalyst,and ethanol as solute,meanwhile in the hydrogenation,the impurity in material could also ...

缩合反应采用异丁醛和甲醛为原料，三乙胺为催化剂，在 60℃左右反应，缩合产物经减压蒸馏和结晶、干燥，得到收率为 90 %以上的中间体羟基戊醛；加氢反应采用自制的Cu -ZnO催化剂，乙醇为溶剂，在 15 0℃将HPA加氢生成新戊二醇，HPA转化率为 99%，新戊二醇收率在 95 %以上，而且HPA缩合反应的副产物在加氢反应中也转化为新戊二醇。

Quinic acid is an important fine chemical product and intermediates of drag synthesis, which can be numerously used in drag synthesis, food and the chemical industry, So it has increasing commercial demand.

奎尼酸是一种具有极高价值的精细化工产品和医药中间体，在医药工业、食品工业、化工等行业均有广泛的用途，市场需求很大。

The alkylbenzene and alkylmethylbenzene are sulfonated by using 20% oleum as the sulfonating agent.

采用发烟硫酸对合成的系列烷基苯中间体进行磺化。

At the same time, the research provides important theoretical evidence for the further study on the hydrolysable principle of cocaine in human\'s body, for the sake of designing the more active one-celled clone antibody which can catalyze the hydrolyzation of cocaine.

本文用密度泛函的B3LYP方法，在6-31G~*水平上对反应物、产物以及各种可能的中间体和过渡态进行了全参数优化，在同一理论水平上对势能面上的全部驻点进行了振动频率分析(来源：Ac9BCa6论文网www.abclunwen.com)。

The method is raw material with pyrimidine of 5- fluorine make water, after reacting with chloric second acid below the intention that changes potassium in oxyhydrogen, with complex intermediate body 2- amino - 5- is replaced - 1, 3, 2 Zun reaction makes 4- Sai target content, evaluate its to fight tumor active.

方法以5-氟尿嘧啶为原料，在氢氧化钾的功能下和氯乙酸反应后，和合成的中间体2-氨基-5-取代-1，3，4-噻二唑反应制得目标物，并评价其抗肿瘤活性。

During the manufacturing of the critical intermediate cephalosporin nucleus --7-amino-3-chloro-cephalosporanic acid diphenylmethyl ester hydrochloride salt, first the feasibility of the one-pot synthetic route of open loop, closed loop and ozonization when chlorine is passed over is qualified by experiments. Then the critical factors that will influence this reaction are studied as follows: the mol ratio of triphenyl phosphite and Diphenylmethyl 3-hydroxy-7-phenylacetaminoceph-3-em-4-carboxylate-l-oxide is four to one; the quantity of the stablizer should be at least more than two to one. The temperature of the system must be 25℃ when chlorine is passed over so that the hydrochloride can be precipitated to obtain cephalosporin nucleus of cefaclor--7-amino-3-chloro-cephalosporanic acid diphenylmethyl ester hydrochloride salt.

在制备关键中间体头孢母核7-氨基-3-氯头孢烷酸二苯甲酯盐酸盐时，先通过实验验证把开环、闭环、臭氧化三步在通入氯气时并为一锅煮的合成路线的可行性之外，又研究了影响该反应的几个重要因素：亚磷酸三苯酯与3-羟基-7-头孢烷-5-亚砜-2-甲酸二苯甲酯的摩尔比为4：1；稳定剂2-甲基-2-丁烯的用量至少大于2：1，通入氯化氢气体时体系温度在25℃时盐酸盐则能够顺利析出，获得头孢克洛的头孢母核—7-氨基-3-氯头孢烷酸二苯甲酯盐酸盐。

To realize our goal, two kinds of vanadium source, including amorphous vanadium pentoxide, and the intermediate in the process of forming vanadium pentoxide gels, were used as precursors in this study.

于是，我们在研究中使用了两种钒源用作反应前驱体（一种是无定形的V2O5粉末，另一种是H2O2处理V2O5形成溶胶过程的中间体），选取了多碳醇与烷基链相同的单胺两种结构导向剂。

Our company has been dealing in chemical raw materials and pharmaceutical intermediate perennially.

我公司常年经销进口医药化工原料及中间体和其他精细化工产品。

Saturated Ag/AgCl. Furthermore, in situ UV-Vis spectra showed that the electrocopolymerization between m-toluidine and p-phenylenediamine was performed. The p-phenylenediamine might react with m-toluidine to yield more active intermediates, which not only promote polymerization but also accelerate polymerization. In addition, through that p-phenylenediamine could be incorporated into copolymer to make the copolymer have a phenazine or phenazine like cyclic structure, which was proved by the FTIR of polymers.

在恒电位电解的条件下，相应的原位紫外-可见光谱和聚合物的傅立叶变换红外光谱表明间甲基苯胺和对苯二胺能发生电化学共聚反应，由于对苯二胺可能与间甲基苯胺形成了具有较强反应活性的中间体，使得对苯二胺的加入不但促进和加速了聚合反应，而且还结合进聚合物中形成了phenazine或类似于phenazine的环结构。

On the basis of HPLC analytical results, a reaction mechanism between chlorine dioxide and phenol had been proposed. The rate control step in the process of reaction was studied by using ab initio method. Opmital geometry of every species in reaction was caculated by the available gratient optimum software. The result of harmonic vibrational frequencies indicated that phenolate radical was a stable intermediale product.

根据对ClO〓氧化苯酚后的高压液相色谱图，提出了ClO〓与苯酚氧化反应的机理，并对反应机理中的速度控制步骤进行量子化学理论剖析，利用梯度优化软件计算了参加反应物种的平衡几何构型，振动频率分析的结果表明：酚氧自由基是稳定的反应中间体，利用ab initio计算软件计算了参加反应物种的总能量，酚盐负离子中的氧原子电荷密度，布居数和前线轨道。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。