酯

In particular, when the Knoevenagel condensation of 2-hydroxybenzaldehyde was conducted with ethyl 2-cyanoacetate, 3-ethoxycarbonylcoumarin was obtained by simultaneous cyclization and alcoholysis of cyanide.

当反应底物为水杨醛与氰基乙酸乙酯的时候，产物为3-乙氧基羰基香豆素，这是水杨醛和氰基乙酸乙酯缩合关环，再发生氰基醇解的产物。

Low molecular weight mannuronic acid, guluronic acid and κ carrageenan were prepared from algin and carrageenan by the acid hydrolysis method, and their weight average molecular weights and the distribution widths of molecular weight were determined by high performance gel permeation chromatography respectively.

本文以褐藻胶和κ-卡拉胶为原料通过酸水解分别获得了低聚的甘露糖醛酸、古罗糖醛酸和低聚κ-卡拉胶，并采用 HPGPC法测定了这 3种低聚糖的重均分子量。在此基础上再经硫酸酯化和成盐修饰制备了各自的硫酸酯碱式铝盐。

Ingredients:Water、Collagen、Palmitoyl Pentapeptide、Sodium Hyaluronate、Seamollient、Gamma-Polyglutamic Acid、Evening Primrose Oil、Squalene、Algin、Aescufos、Arbutin、Tranexamic Acid、Myoxinol、Eyeseryl、Idebenone、Olive Extract、Vitamin E、Cetyl Alcohol、Glyceryl Monostearate、1-3butylene Glycol、Glycerin、Methyl Paraben、Perfume.

产品成份：去离子水、胶原蛋白、五胜肽、玻尿酸、海藻黏多醣体、纳豆聚麸胺酸、月见草油、海鲛鲨、藻胶、七叶树、熊果素、传明酸、六胜肽、四胜肽、艾地苯橙、橄榄萃取、维他命E、棕榈醇、单硬脂酸甘油酯、丁二醇、丙三醇、羟苯丙酯、香精。

There are 65 species of Chinese herbs with confirmed anti-HBV activityd, in which 16 probable active constituents are pointed out. They are arene, ketone derivatives, alicyclic carboxylic acid, aromatic carboxylic acid, ester, lactone, cyanide derivatives, heterocycle derivatives, carotenoids, anthraquinones, flavonoids, vegetable tannin, alkaloid, terpenoids, steroids and protein. Among them, the complexes of flavonoids, terpenoids, steroids and alkaloids are more abundant.

确定了具有抗乙肝病毒活性的中草药品种65种，其中含可能活性成分共16种，即芳烃、酮类衍生物、脂环族羧酸、芳香族羧酸、酯、内酯、氰类衍生物、杂环衍生物、类胡萝卜素、蒽醌类、黄酮类、植物鞣质、生物碱、萜类、甾类和蛋白质，而16种中以黄酮类、萜类、甾类和生物碱类成分为多。

The invention relates to a method for making oligomeric isocyanates by reacting diisocyanates in the presence of a catalyst, wherein the catalyst comprises a saline compound prepared from an anion selected from 1,2,3- or 1,2,4-triazole, a substituted species of 1,2,3- or 1,2,4-triazole and carbocyclically and/or heterocyclically annellated species of 1,2,3- or 1,2,4-triazole and the cation selected from an alkali metal, alkaline-earth metal and/or monovalent ammonium cation and/or phosphonium cation of formula (5), wherein the E, R1, R2, R3, R4 are as defined in the descriotion.

本发明涉及一种制备低聚异氰酸酯的方法，包括二异氰酸酯在催化剂的存在下进行反应，其中所述催化剂由盐化合物组成，该盐化合物由选自1，2，3-或1，2，4-三唑、1，2，3-或1，2，4-三唑的取代系列者、1，2，4-三唑的碳环稠合系列者、1，2，3-或1，2，4-三唑的杂环稠合系列者的化合物及其混合物的阴离子和选自碱金属、碱土金属和/或通式(5)的一价铵阳离子和/或磷友衾胱拥难衾胱又票福其中E、R 1 、R 2 、R 3 和R 4 如说明书中所定义。

The effects of above-mentionedconditions on alkylene reaction are studied to obtain the optimum reactive conditionsby orthogonal experiments having seven factors and three levels. GCLE is chosen as material to prepare 7-phenyl acetamideyl vinyl cephalkyl acidp-methoxy benyl eatsr in the experiment. The process is as follow: GCLE reacts withiodide in solvent, and produce 3-iodid, then reacts with PPh_3 to produce Witting agent,and reacts with HCHO to produce 7-phenyl acetamideyl vinyl cephalkyl acid p-methoxy benyl eatsr in alkaline conditions.

试验选用GCLE作为原料制备7-苯乙酰氨基-3-乙烯基头孢烷酸对甲氧苄酯，反应过程如下：GCLE与碘化物、PPh3在溶剂中反应生成3位膦盐，在碱性条件下生成Wittig试剂再与HCHO反应生成7-苯乙酰氨基-3-乙烯基头孢烷酸对甲氧苄酯。

Based on the work of the first part, we studied the possibility of allyl as a protection group in the synthesis of oligonucleotides consisting in some unstable nucleotide analogues, such as nueleoside carbonate and sulfite.

在寡核苷酸的类似物中，碳酸酯及亚硫酸酯在碱性条件下的不稳定性使其在合成上有一定的困难，这限制了对它们的性质作进一步的研究。

The effect of aluminate coupling agent on interfacial properties between bamboo powder and polycaprolactone was studied in this paper.

研究铝酸酯作为竹粉和聚己内酯的偶联剂对竹塑复合材料界面性能的影响。

On the basis of analyzing data about stearic acid triethanolamine ester quaternary's preparation process and methods of analysis and identification, this article summarized synthetic conditions for this quaternary ammonium salt, this synthetic condition composed by synthesis of esters and quaternary ammoniation.

在对有关硬脂酸三乙醇胺酯季铵盐的制备工艺、分析鉴定方法的资料分析的基础上，综述了由硬脂酸制备该季铵盐的工艺条件，该工艺条件由酯胺的合成和季铵化2步构成。

The route include three steps: etherification, ammoniation and then oxidation. Factors such as chloracetate, reaction temperature on process were studied. And discussed the ionic liquid was recovered.

讨论了不同的氯乙酸酯和反应温度对醚化反应收率的影响，讨论了不同的二苯甲硫乙酸酯对氨解反应收率的影响，及离子液体的回收使用。

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。