三代的

Chlorobenzothiazole was synthesizedby the reaction of 2 mercaptobenzothiazole and trichloromethyl chloroformate , and the reaction eorrelitions were investigated.

研究了以 2 巯基苯骈噻唑为原料，采用氯甲酸三氯甲酯为氯化剂合成 2 氯代苯骈噻唑的方法，重点考察了不同溶剂和反应温度对合成反应的影响，为 2 氯代苯骈噻唑的合成提供了一种新的方法。

The first synthetic route uses 1,2,4-trimethoxybenzene and chloroacetonitrile in forming 2,4,5-trimethoxy-a-chlor-acetophenone under the anhydrous condition, then the intermediate condensates with papaverine forming the core pyrro[2,l-a]isoquinoline, followed by formation and lactonization to form the lactone ring. The second synthetic route uses prepared aldehyde with prepared ethyl nitroacetate by Knoevenagel condensation to obtain 2-Nitro-3-(2,4,5-tris-methoxy-phenyl)-acrylic acid ethyl ester and 2-Nitro-3-(2,4,5-tris-benzyloxy -phenyl)-acrylic acid ethyl ester etal intermediates. The lamellarin skeleton could arise from condensation of the papaverine and these intermediates by Michael reaction, the ester group is provided for subsequent lactonization. The third synthetic route uses coumarin or indan-l,3-dione derivatives and papaverine to form lamellarin under basic conditions.

第一条路线首先从1，2，4-三甲氧基苯出发与卤乙腈作用合成卤代芳酮中间体，然后与罂粟碱反应合成开链片螺素，最后经乙酰化、去保护、成内酯环得到片螺素；第二条路线由制备的芳醛和制备的硝基乙酸乙酯经缩合得到2-硝基-3-芳基丙烯酸乙酯，然后由该中间体与罂粟碱反应，在完成关环的同时也引入酯基，最后去保护、成内酯环得到片螺素；第三条路线是由香豆素或茚二酮出发，经溴代后的中间体与罂粟碱反应，得到片螺素的基本框架。

The thesis consists of two main sections. The synthesis of 1,3,4-thiadiazoles,triazolotriazines and dioxapyrrolinopyrazoles containing chiral pyrazolyl moietyfrom D-glucose is described in the first part and the section one is about theDiels-Alder reactions between dienophile enaminones and diene 1,2,4-triazines,which provides a new methodology to construct the pyridine compounds. A total of37 new compounds were synthesized.

本论文包含两部分内容，一是以D-葡萄糖为原料合成含手性吡唑基的1，3，4-噁二唑、三唑并三嗪及二氧代吡咯啉并吡唑类化合物；二是将烯胺酮作为亲双烯体，与双烯体1，2，4-三嗪类化合物发生Diels-Alder反应，发现了一令人意外的构建吡啶类化合物的新方法。

This article reviews three kinds of methods for manufacture halogenated aromatic amine ,and the strong and weak points of the three reduction methods are pointed out.

本文综述了由卤代芳硝基物还原制备卤代芳胺的三种方法，并对几种还原方法的优缺点进行了对比和讨论，得出水合肼还原具有很好的应用前景。

Based on the research and development of synthesis of halogenated pyridines the paper chose the electrochemical reduction as a research direction, and to 3,4,5,6–tetrachloropicolinic acid, pentachloropyridine, 3,4,5,6-tetrachloro-2-trichloromethylpyridine for raw materials, the reduction behavior on silver and carbon -containing silver electrode was mainly studied.

全卤吡啶脱氯是卤代吡啶类化合物合成的新尝试，本文在国内外卤代吡啶合成研究的基础上，选择了以电化学还原作为研究方向，以3，4，5，6-四氯吡啶甲酸、五氯吡啶、3，4，5，6-四氯-2-三氯甲基吡啶为原料，主要研究了其在银和碳载银电极上的还原行为。

Methods Primary human embryonic germ cells were obtained by tissue culturing of embryonic genital ridges and mesenteries from the embryos aged 8 weeks, and then were passaged on the 8th and 16th day using pick-up and digestive passage method. Three kinds of digestive juice were used.

取8周人胚胎的生殖腺嵴和肠背系膜，进行组织块体外培养人胚胎生殖细胞，选择原代培养第8天和第16天的细胞，采用挑取传代法和消化传代法，其中的消化传代法采用三种不同的消化液进行传代培养，记录各代培养的细胞集落数。

Different long-term research in the Pearl River Delta's economy, Wang Jun, China's manufacturing industry has three modes: First, the Pearl River east coast model for processing trade, mainly to foundry business mostly,"two out" obvious characteristics; Second, the Pearl River in the West Bank mode, its own marketing network and brand, technology and resources from other regions or abroad the entry of products to the domestic-oriented; Third, the Yangtze River Delta mode, to use the resources and the mainland domestic market-oriented products.

在长期研究珠三角经济的王珺看来，中国制造业有三种模式：一是珠江东岸模式，以加工贸易为主，以代工企业居多，&两头在外&特征明显；二是珠江西岸模式，自有市场网络和品牌，技术与资源从其他地区或境外进入，产品以内销为主；三是长三角模式，以使用内地资源和产品内销为主。

This research used Hepato-pancreas of Ctenopharyngodon idellus as experimental material to study toxicological effect of olaquindox on liver cell and pancreas exocrine cell of Ctenopharyngodon idellus, using the method of histochemisiry, primary cell culture, and immunocytochemistry, and the cells were observed by TEM and LSCM.

本研究以草鱼肝胰脏(Hepato-pancreas)为试验材料，通过原代细胞培养，组织化学，免疫荧光细胞化学等实验方法，运用透射电子显微镜，激光共聚焦扫描显微镜等手段，观察三种不同浓度的喹乙醇对体外原代培养的草鱼肝细胞和胰腺外分泌部细胞的毒理影响。

From research,It is known that the flux of single-phase transformer would offset and exciting current of single-phase transformer would be distorted under DC current inrushing.

直流电流通过两个Y0连接的变压器中性点侵入电力系统，故针对三相三柱变压器直流入侵情况建立了直流入侵下的三相三柱变压器的电路模型和相应的方程，结合三柱磁路的麦克斯韦方程和非线性的B—H曲线方程，利用数字迭代法，在MATLAB环境下编程计算了三相三柱变压器直流入侵下的变压器励磁电流和谐波特征。

This paper introduces the "Three Hundred Tang Poems," a book by the famous comments on behalf of, premium note, sequel of the classic version, and through questionnaires, data collection and network of bookshops in the form of field research, try to understand today's readers of "Don Poetry 300,"the demand for aircraft sales in the" Three Hundred Tang Poems ", and As well as readers for a number of the current best-selling "Three Hundred Tang Poems" evaluation.

本文主要介绍《唐诗三百首》一书经各代名家点评、补注、续编的经典版本，并通过调查问卷、网络书店数据搜集和实地调研的形式，试了解当今读者对于《唐诗三百首》的需求、在架销售的《唐诗三百首》的情况，以及读者对于当前热销的几个《唐诗三百首》的评价。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。