酸酐

Methods:A series of DMY acetates were synthesized with different ratio of acetic anhydride to DMY,the antioxidation capability of them for lard was determinated.

采用改变乙酸酐与二氢杨梅素投料比，合成不同酯化程度的二氢杨梅素酯，并用猪油体系测定其抗氧活性。

Can with water, alcohol and ammonia reaction, difference generate acids, esters and amides, the reaction rate than the corresponding ester and anhydride fast.

可与水，醇和氨反应，分别生成酸、酯和酰胺，反应速度比相应的酯和酸酐快。

The procedure used was the same as above except that the reaction mixture was sealed in an ampule under vacuum and placed in an oil bath at 1000C using maleic anhydride and EtMI as comonomers.

所采用的程序是一样的，除了上述反应混合物被密封在一安瓿真空条件下并放置在一油浴在1000c使用顺丁烯二酸酐和etmi作为comonomers 。

The synthesis of target compound 6 was by mixture anhydrides method.

结论采用重复过量混合酸酐法合成了目标化合物（6），所用方法经济、有效、可靠。

This design is yearly produces 100,000 tons chromic anhydrides the synthesis crafts, uses in the sulfuric acid method the single pot process to carry on the production.

本设计是年产10万吨铬酸酐的合成工艺，采用硫酸法中的单罐法进行生产。

Compared with original process, the problems of the reaction of mixed acid anhydrides and hydrolyzation were solved. The improved process has high yield, low cost and is easy to operate, while the quality of products is much more stable and suitable for industrial production.

改进后的工艺新解决了原工艺酸酐反应不完全及水解等问题，操作简单、产品质量稳定、收率高、成本低、更适合工业化生产。

Five parameters in the process, namely initial starch slurry concentration, pH, reaction temperature, reaction time and anhydrides concentration were investigated.

以轻度水解淀粉为原料，以取代度为衡量标准，采用单因素和正交试验方法研究湿法工艺制备辛烯基琥珀酸淀粉酯，从淀粉乳的初始浓度、pH、反应温度、反应时间和酸酐浓度五个方面研究辛烯基琥珀酸淀粉酯最佳制备工艺。

Phosphate esters and anhydrides play important roles in the biosynthesis of protein, they act as the activators and carriers of amino acids in the biochemica reactions, and go away as the leaving groups after the formation of peptide bond.

磷酸酯及其酸酐在蛋白质的生物合成中起着十分重要的作用，它们充当了氨基酸的活化试剂和运输载体，当肽键形成后又作为离去基团离去。

Methods Amoxicillin was synthesized from a main raw material 6-aminopenicillanic acid(6-APA) and acid anhydrides by nucleophilic substitution.

以6-APA为起始原料，工艺路线为6-APA胺盐溶液与混合酸酐反应得阿莫西林。

Peptides are traditionally synthesized in liquid phase, such methods are DCC, mixed anhydrides, acyl chloride and azide etc., which provide more choices for peptides synthesis.

传统的肽类合成多采用液相化学合成，常用的包括碳二亚胺法，混合酸酐法、酰氯法、叠氮物法等等，为多肽的合成提供了多种选择。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。