查询词典 iodic anhydride

Kinetics of photo-chlorination of acetic acid to form monochloroacetic acid ;2. The mechanism for chlorinate acetic acid to monochloroacetic acid by using acetic anhydride or sulfur as catalysts respectively was studied.

通过对硫磺和乙酐催化氯化制备氯乙酸反应机理的分析研究，采用硫磺及乙酐复合催化剂，并且对氯化温度、氯化气氛、尾气回收等进行了过程优化，实现了乙酸氯化反应工艺条件的重大突破，使得氯乙酸的收率达到92。

Synthesis process of 2,6-dichloro-3-methylaniline was investigated 3-methylaniline was first N-acetylated with acetic anhydride,then treated with chlorosulphonic acid and ammonia yielding the 2-methyl-4--benzenesulfonic amide,which wasin turn deacetylated,chlorinated and hydrolyzed to the title compound.Hydrochloric acid was used instead of sodium hydroxide in deacetylation and sodium chlorate instead of hydrogen peroxide as oxidant in chlorination.

合成工艺2，6-二氯-3-甲基苯胺调查3-甲基首次N-乙酰与醋酸酐，然后与氯磺酸和氨产量 2-甲基-4--苯磺酰胺基，而擅转乙酰，氯化和水解的标题compound.hydrochloric酸代替氢氧化钠乙酰氯酸钠代替双氧水为氧化剂，加氯。

Mono-cinnamyl maleate was prepared by esterification of maleic anhydride and cinnamyl alcohol of 1 mol:2 mol at 95 ℃ for 2～4 h.Then added isomeric catalyst and mono-cinnamyl fumarate was made by reacting at 90 ℃ for 4 h.After methanol (methanol:mono-cinnamyl fumarate = 6 mol:1 mol) was added,the mixture maintained at 90 ℃ for 4.0 h to synthesize CMF.

合成试验表明：以摩尔比为1：2的马来酸酐与肉桂醇在95 ℃醇解反应2～4 h后加入异构化催化剂，90 ℃转型反应4 h后，添加6倍摩尔质量的甲醇，在90 ℃恒温反应4 h，反丁烯二酸桂醇甲酯的合成产率较高。

N-p-tolylmaleimide is a kind of monomer to copolymerize with MMA to enhance the thermal stabilities of PMMA.In this article, NPTMI was prepared from the reaction of maleic anhydride and p-toluidine in one stage, which was testified by FTIR. The mp. of NPTMI was 154 and consistent with the literature.

目前国外对这方面的研究比较成熟，国内研究的较少，且还没有对N-对甲基苯基马来酰亚胺、MMA和第三单体丙烯腈或苯乙烯共聚以制备耐热PMMA树脂及其性能的研究。

Ninth Five-Year Plan period, the Company conducted a medical intermediates of the pre-development and market research, the introduction of the development of superior strength skin, crotonic acid, crotonic anhydride and other products; also produced 3,3 dimethyl methacrylate, antibiotics raw material products, as well as more than 20 kinds of iso-vanillin and other pharmaceutical intermediates.

九五期间，本公司进行了医化中间体的前期开发和市场调查，引进开发了优力肤、巴豆酸、巴豆酸酐等系列产品；还生产了3，3二甲基丙烯酸甲酯、抗生素原料药系列产品以及异香兰素等二十多种医药中间体。

Based on the problem of various types of catalyst and according to the features of carbonylation catalysts reactions, our team has been designed a series of new metal complexes of benimidazoles, which can be used for carbonylation catalyst of industry. Seven new benzimidazole derivatives were prepared by the o-phenylenediamine、oxalic acid、glycolic acid、monomethyl monopotassium malonate、ethyl cyanoacetate、succinic anhydride. The structures of them were confirmed by IR、Elemental analsis. The crystal structures of d and e were determined by X-ray single crystal diffraction of Germanic Bruker Smart APEX II CCD. The catalysis of them was tested by carbonylation reactions.

本文设计以邻苯二胺和草酸、羟基乙酸、丙二酸单甲酯、氰基乙酸乙酯、丁二酸单甲酯为原料采用PPA催化和无机酸催化法，合成了4种苯并咪唑-2-羧酸衍生物并进行了表征；培养了2个化合物d、e的晶体并测定和讨论了晶体结构；制备了3种未见报道的苯并咪唑金属配合物，对配合物在羰基化法制醋酐-醋酸反应的催化作用进行了初步试验。

The catalytic activity of iodine in the esterification reaction was studied by synthesis cyclohexyl acetate from acetic anhydride,cyclohexano and acetic acid,cyclohexano.

以单质碘为催化剂，通过乙酸酐、环己醇及乙酸、环己醇为原料合成乙酸环己酯，对碘的催化活性进行了研究。

A small molecule core (TMP-SK3)with three terminal carboxyl groups was synthesized successfully by the reaction of 1,1,1-trihydroxymethylpropane with the excessive sebacic acid diacetic anhydride.

以1，1，1-三羟甲基丙烷与过量癸二酸二乙酸酐反应，制得了端羧基的三官能度小分子核三癸二酸三羟甲基丙烷酯（TMP-SK3）。

Star polymer ; 1; 1-Trihydroxymethylpropane ; Sebacic acid diacetic anhydride ; PEG

星型聚合物； 1； 1-三羟甲基丙烷；癸二酸二乙酸酐；聚乙二醇

A white-threadlike solid copolymer has been prepared from maleic anhydride, acrylamide and methyl acrylate initiated by dibenzoyl peroxide in an aqueous solution. The scale inhibiting efficiency of the copolymer to simulated water containing CaCO3 is studied.

以马来酸酐、丙烯酰胺、丙烯酸甲酯为单体，水为溶剂，过氧化二苯甲酰为引发剂合成一种白色丝状固体共聚物阻垢剂。

Finally it offers the analysis of the fault-tolerance system as well as its test verification.

这样，运行于空间环境中的系统的设计目标就是在保证系统实时性

However, it is still difficult to find out the real reason of the increase of the keratinized gingiva during the orthodontic extrusion whether it is due to the proliferation of the gingival tissue or to its elastic nature, that is because the proliferation of the fibroblasts as well as the connective tissue changes in volume and the intra-fibers spaces were all immeasurable in most of the studies.

然而，仍然难以找到真正的原因增加的角化牙龈在正畸挤压它是否是由于扩散的牙龈组织或其弹性性质，这是因为增殖的成纤维细胞以及作为结缔组织的变化量和内部纤维空格都是不可估量的，大多数的研究。