查询词典 piperidine

MethodsWith the extract yield and piperyl piperidine content as index, orthogonal test was used to evaluate the influence factors, including the concentration of alcohol, the extracting time and the amount of alcohol.

方法采用正交实验法，以固含量和胡椒碱含量为考察指标，对乙醇浓度、回流次数、乙醇用量等影响因素进行研究。

Genomic DNAs were then purified from these cells and treated with piperidine for chemical cleavage. Adjust treated DNA concentration to 0.4μg/μl.

细胞裂解后，用常规方法制备基因组DNA，而后进行吡啶化学法裂解，调整裂解后的DNA浓度为0.4μg/μl。

The title compound C_(27)H_(23)FN_(4)O_(2)C_(2H_(5)OH was obtained by the reaction of 1-phenyl-3-methyl-5-pyrazolone with 2-fluorobenzaldehyde in ethanol in the presence of piperidine under microwave irradiation and recrystallization from ethanol.

标题化合物C27H23FN4O2(C2H5OH)是由2分子1-苯基-3-甲基-5-吡唑啉酮和1分子2-苯甲醛微波辐射4 m in，用乙醇重结晶得到。

We discussed the syntheses of two different types of plant alkaloids in this thesis. In part A, we aimed at total syntheses in two kinds of aporphine alkaloids, lirioferine and boldine. In part B, we developed a tactic about radical cyclization in polyhydroxylated piperidine synthesis.

中文摘要本篇论文中探讨了两种不同种类植物碱的合成，在A部分中，我们针对阿朴吩类天然物中的鹅掌楸啡碱与波儿丁碱做了各自的全合成研究；在B部分中，我们发展了一种自由基环化策略运用在含多羟的哌啶类化合物之合成上。

Some new α,β-unsaturated sulfones were prepared by condensation of 4-nitrophenylsulfonylacetates with aromatic aldehydes in cyclohexane/CH_3CH_2OH in the presence of catalytic amounts of piperidine.

不饱和砜是以对硝基苯磺酰基乙酸酯为原料与芳香醛在六氢吡啶醋酸盐催化下发生缩合反应制得的。

The tremendous influence on the toughening effect by the added bisphenol A was only obtained when the basic catalytic curing agents such as piperidine and triethanol amine were used. The rise in the ...

结果指出固化物冲击韧性的提高与网络交联密度有关，断裂韧性的提高是析出橡胶相体积分数增大和基体交联密度减小的协同作用所致。

The reactions of several phenols and 2, 2, 6, 6-tetramethyl-4-substituted piperidine oxoammonium salt have been studied. It was found that these oxoammonium salts are new facile reagents for phenolic coupling.

应用2，2，6，6-四甲基哌啶氧铵盐实现了酚类的氧化偶联反应：对位取代的酚类底物得到邻位-邻位偶联产物；2，6-二取代的酚类底物得到对位-对位偶联产物；2，4，6-三取代的阻碍酚类底物得到苄位氧化偶联产物。

Our products including protected amino acid, pyrrolidine derivatives, piperidine derivatives, nature products, drug intermediates and chiral intermediates.

同时四川艾格尔生物科技有限公司为国内的医药及精细化学公司提供技术服务和咨询。

The pitting growth for 304 stainless steel in 0.5mol/L NaCl and its inhibition by piperidine were investigated by means of atomic absorption spectrometry and pitting current-time curve measurements under potentiostatic condition.

采用恒电位计时电流法研究了304不锈钢在0.5mol/L NaCl介质中孔蚀发展过程及缓蚀剂对孔蚀发展的抑制作用，同时用原子吸收光谱测定合金各组分元素的溶解量。

The piperidine and its ramification selected as raw material to synthesis α-aminonitriles were studied in detail firstly. The oxidation potentials of the amines were determined through the liner sweep voltammetry study.

首先详细研究了以哌啶及其衍生物作为合成原料，通过极化曲线法确定了其氧化电位，并首次发现了氧化电位与1H NMR的化学位移之间的相关性。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐