查询词典 acetacetic ester

Objective To determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of Edaravone, by gas chromatography.

摘要］ 目的：用气相色谱法测定依达拉奉合成起始原料乙酰乙酸乙酯中丙酮的残留量。

Extracting Tea Polyphenolswith acetoacetic ester is a Key technique in TP indus- trial production.

乙酸乙酯萃取茶多酚是茶多酚工业生产中的关键技术。

Objective To determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of Edaravone, by gas chromatography.Methods Sample solution was injected on a GDX column (0.18 mm～0.25 mm) with nitrogen as the carrier gas.The residue was calculated by the external standard method.

摘要］ 目的：用气相色谱法测定依达拉奉合成起始原料乙酰乙酸乙酯中丙酮的残留量方法：采用固定相二乙烯苯乙基乙烯苯型高分子孔小球（直径为0.18 mm～0.25 mm），氮气为载气，用外标法测定乙酰乙酸乙酯中残留丙酮的含量。

N-substituted pyrroles are synthesized by reacting acetonylacetone with carbamic ester , catalysted by p-toluenyl sulfonic acid, heated at reflux temperature for 6h, collecting evolved water, giving to 75% yields, which is 26% more than the literature value.

以对甲苯磺酸为催化剂，用甲苯作溶剂，使2，5-己二酮与氨基甲酸酯在110℃反应6h，合成了5种氮取代吡咯衍生物，其中两种未见文献报道，反应产率均达到75％以上，比文献值高出了26％。

Preparation of the lateral chain-4-benzyloxy-3-hydroxy butyronitrile is introduced as the substrate, the REFORMATSKY reaction is performed, then obtains the dicarbonyl ester, in the structure of which containing a chiral hydroxyl group, then performs the chiral reduction, take off the benzyl group after the protection reaction with acetonylidene,then obtains the lateral chain by oxidation.

手性侧链醛的合成：采用-4-苄氧基-3-羟基丁腈作为底物，通过REFORMATSKY反应缩合得到含有手性羟基的二羰物酯，再手性还原，丙酮叉保护后氢解脱苄，最后氧化得到侧链醛。

A method to synthsis a - methylene - r - butyrolactones was reported by the substituted (a - carbethoxyvinyl) cuprate intermediates, generated by the addition of higer order cuprate to acetylenic ester,traping with epoxides stereoselectively.

本文报道了通过以高序铜代替低序铜对炔酸酯加成得到的取代铜与端基或环状环氧化合物的立体选择性反应，较高产率的合成α，β-取代烯酯，进而可合成α-亚烷基-γ-丁内酯类衍生物。

In chapter 2, we introduced the fabrication of two kind of CE-CL interfaces, which are able to be used for the detection of Acridinium ester and its' labeled analytes.

论文的第二部分（包括第2、3、4章）主要涉及毛细管电泳化学发光检测器的研制及应用研究。

To explore the clinical reliability and usability of the acridinium ester-labeled CLIP and ELISA in detection of AFP to establish a specific, effective, simple and reliable detecting method in our lab.

［目的］探讨吖啶酯标记的化学发光免疫测定(chemiluminescence immunoassay， CLIA)分析技术与酶联免疫吸附试验一步法两种方法检测甲胎蛋白(Alpha-fetoprotein， AFP)的临床可靠性、适用性。建立本室特异、有效、方便、可靠的试验方法。

CLIA using acridinium ester derivatives as chemiluminescent label has advantages of low background,high signal-to-noise ratio,no need of catalyst and simple luminescence system.

以吖啶酯衍生物为发光标记物的CLIA的特点是：标记简单、标记物稳定、不需要催化剂、自然本底低、受外界干扰因素少、信噪比高、发光体系简单等。

In the two-site sandwich CLIA for TSH,two anti-TSH monoclonal antibodies were involved,one was coated on microwells and another was labeled with acridinium ester. The assay sensitivity is 0.01mlU/L. Intrassay and interassay coefficients of variation are 4.29-6.71 and 4.36-6.14%,respectively. Average recovery is 98%.

以 DMAE·NHS为发光标记物，研究建立了两种 TSH CLIA方法，均采用一步夹心免疫分析法，在第一种方法中一株抗TSH单克隆抗体包被微孔板，另一株标记DMAE·N'HS，方法的分析灵敏度为0.olmIUA，批内变异系数为 4.29巧。71％，批间变异系数为 4.36ed.14％，平均回收率为 98％，与 TSH IRMA法的相关方程为 Y－0.20＋0.92X，相关系数为 0.993，与 Ciba Co讪ng TSH CLIA测量值的相关方程为 Y—0.16＋0.92兄相关系数为 0.986。

However it can often be frust ating for a child when people are unable to pronounce their name.

但它往往可以令人沮丧的一个孩子当人们无法断言他们的名字。

All these compounds were obtained from this genus for the first time. Compound, 4-cumylphenol, was a new nature product.

所有化合物均为首次从本属海藻中分离得到，其中4cumylphenol为新天然产物。