丁二酸的

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids in the presence of sodium dithionite at room temperature in aqueous acetonitrile solution [CH〓CN: H〓O=3: 1 ] to gave the corresponding adducts, the latter could form γ-lactones 31～51 in the same medium in 62～92％ yield.

室温下，在乙腈/水[3：1]的介质中，多氟烷基碘化物在连二亚硫酸钠的存在下与4-戊烯酸及其在2或3位上具有取代基团的衍生物进行反应，反应2～5h，起先生成两者的加成物，该加成物无需分离，在同一介质中，可进一步反应得到相应的多氟烷基取代的γ-丁内酯31～51，产率62％～92％。

The leaves, leafstalk, and stems from grapes were used as explants to induce calli and subculture in medium (100 mL B5 medium containing 3 g sucrose and 0.6 g agar) with different plant hormone combinations (6-BA, KT, IBA, 2, 4-D), and then the resveratol content from those calli was determinated by using HPLC.

以葡萄的叶、叶柄和茎分别作为外植体，在不同激素组合（6-卞氨基嘌呤(6-BA)、激动素、吲哚丁酸、2，4-二氯苯氧乙酸(2，4-D)）的培养基（以B5培养基为基本培养基，含30g/L蔗糖和6g/L琼脂）上，进行愈伤组织的诱导和继代培养，并利用高效液相色谱法对不同来源愈伤组织中的白藜芦醇含量进行测定。

Project Background and Conditions: The company started research new chemical products in 1998. After two years of efforts, a series of pharmaceutical intermediate sulfathiazole leave instructions, including : 3- methyl sulfathiazole leave instructions, 2- sulfathiazole leave instructions ethanoic acid, 2- acetyl sulfathiazole leave instructions, 2-thiofuran amino ethane ,2-thiofuran acetic, 3,4,5- tighter nitrobenzene have been successfully developed. 2-thiofuran amino ethane are the precursors raw materials of series antibiotic analgesic.

二、项目建设背景及条件：1998年公司开始研究开发高新精细化工产品，经过两年的努力，已成功研制出噻吩系列医药中间体，包括：3-甲基噻吩、2-噻吩乙酸、2-乙酰噻吩、2-噻吩乙胺、2-噻吩乙醇、3，4，5-三氯硝基苯等。2-噻吩乙胺系列噻吩产品使用于血小板及血栓有关的心脏血管病及消炎镇痛等如氯吡格雷、兴孢噻吩钠、兴孢西丁、噻吩洛酸等十几种新药的前体原料，是国家政策鼓励发展和有自主知识产权的项目。

Seven central depressants,including chloral hydrate,potassium bromide,sodium bromide,cal- cium bromide,alcohol,amytal and chloretone, were studied for their effects on the intraperito- neal toxicity of tartar emetic and sodium stibo- gluconate in mice.

1。关于吐酒石与葡萄糖酸锑 V 钠对小白鼠的致死作用，我们探索了一些中枢抑制药与兴奋药的影响。所试的抑制药有水合氯醛，溴化钾，溴化钠，溴化钙，酒精，安眠妥与三氯叔丁醇七种。兴奋药有苯甲酸钠咖啡硷与士的宁二种，以及溴咖合剂。2。

D. of the catalyst increased, i. e. the acid volume of the catalyst increased, the conversion for isobutene and the selectivity for trimer increased also, while the selectivity for dimer decreased, and the selectivity for tetramer was almost unchanged.

D。增加时，即催化剂的酸量增加时，异丁烯的转化率和三聚物的选择性也增加，但二聚物的选择性降低，四聚物的选择性则几乎没有变化。

Therefore, in the laboratory, a 2L gasliquid equilibrium measurement device was used to measure the equilibrium solubility of H2S, CO2, CH3SH and COS in the mixed solutions of Methyldiethanolamine, Tetramethylene sulfone respectively under different temperatures and different proportions. With the relevant parameters being correlated from the measured data, a corresponding thermodynamic calculation model was set up, based on the gasliquid two phase state equilibrium equation, and in combination with the overseas research results.

为此，在实验室利用容积为2 L的气液平衡测定装置，测定了不同温度和溶液配比条件下硫化氢、二氧化碳、甲硫醇、硫氧碳在甲基二乙醇胺（Methyldiethanolamine，MDEA）、环丁砜（Tetramethylene sulfone，TMS）水溶液中的平衡溶解度，并根据气液两相平衡状态方程，结合国外研究成果，利用测定的平衡溶解度数据关联出相关参数，建立了相应的热力学计算模型，用于预测该复杂体系中酸气分压与溶液负荷的气液平衡关系。

Iminodiacetic acid and aspartic acid reacting with t-butyloxycarbonyl anhydride in the basic solvent system of 1,4-dioxane-water gave better yields than those from conventional t-BuOH/H 2O system method,while glutamic acid in both solvent systems of 1,4-dioxane-water and tetrahydrofuran-water also gave better yield.

其中Boc酐法反应条件温和，操作简便，试剂易得且经济，是实验室制备Boc保护的氨基酸的常用方法。常规Boc酐法多采用叔丁醇水和四氢呋喃水的溶剂体系。我们用常规Boc酐法制备Boc 亚氨基二乙酸时，多次重复，收率总是低于 5 0 %，对天冬氨酸和谷氨酸进行Boc化时也有类似情况。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。