查询词典 vinyl acetate

In the presence of catalytic rhodium acetate, ethyl 2-diazo-3-oxo-per fluoroalkanoates, reacted readily with nitriles to give a series of 5-fluoroalkyl substituted 1, 3oxazoles with high regio-selectivity through a metal carbenoid intermediate. The reactions of carbenoids with noncyclic vinyl ethers or cyclic vinyl ethers afforded dihydrofuroates in good to excellent yields. Interestingly, only vinyl C-H insertion compound was obtained concerning of the reaction of carbenoids with 2, 5dimethylfuran due to the steric hindrance of methyl group

醋酸铑分解2-重氮-3-氧代-全氟羧酸乙酯形成的金属卡宾作为1，3-偶极体，可以与一系列芳基或烷基取代的腈反应，高度区域选择性地生成一系列4-乙氧羰基-5-氟烷基取代的噁唑化合物；也可以与富电子的链状和环状的烯基醚反应，以优良的产率得到一系列氟烷基取代的二氢呋喃类化合物；而与2，5-二甲基呋喃的反应，由于甲基的位阻作用，只得到金属卡宾对呋喃3-位烯基碳氢键插入产物。

At last,a convergent and general protocol to marine natural product,as demonstrated by the enantioselective total synthesis of malyngamides O,P,Q,R, 5"-epi-Q and 5"-epi-R bearing terminal vinylic chloride structure,was developed in detail.E,(7S)-7-methoxytetradec-4-enoic acid was prepared using the above described Johnson-Clainsen rearrangement,the terminal vinyl chloride was constructed using Wittig reaction as key step,the pyrrolidone derivative was constructed using L-serine as natural chiral pool.Starting from the synthesis of malyngamides O and P to explore the general route,an aldol reaction of methyl acetate with the vinyl chloride part in the presence of LDA gave the skeleton of amine portion,followed by amidation with the fatty acid finished the synthesis of malyngamide P.

先以malyngamides O和P为试点探索通用合成路线，将乙酸甲酯和烯氯部分在LDA存在下进行aldol反应得到氨部分的骨架，再将手性不饱和脂肪酸和氨部分进行酰胺化反应完成了malyngamide P的合成，将P在碱性条件下进行烯醇甲基化反应完成了malyngamide O的全合成。

The slant-hole tray was applied to the technical innovation of vinyl acetate distillation column.

采用复合斜孔塔板对醋酸乙烯精馏塔进行了技术改造。

The resolution of-HMPC in ionic liquids by commercial lipase was studied in the first place and the resolution of-HMPC in vinyl acetate was chosen as control reaction.

首先对商品酶在离子液体中催化拆分的反应条件进行了优化，并以酶在乙酸乙烯酯中的催化作为对照进行了对比。

Major Products: acetic acid, vinyl acetate monomer and value-added derivatives

重要产品：醋酸，醋酸乙烯单体，增值衍生品

We are also the world's largest producer of acetyl products, including acetic acid, vinyl acetate monomer and polyacetal and a leading global producer of high-performance engineered polymers used in consumer and industrial products and designed to meet highly technical customer requirements.

公司在其主要产品市场上拥有首屈一指的市场地位，是世界上最大的乙酰基产品制造商之一，产品包括醋酸、醋酸乙烯和聚甲醛，公司在聚合物领域内也具有世界领先地位。

In this study, the polyethylene vinyl acetate was bended with carbon black to produce the low temperature response positive temperature coefficient elements.

摘要 本实验用EVA和碳黑混炼制备低温正温度系数材料。

The project products meet the national industrial policy, which are widely used in chemical industry, printing and dyeing, chemical, pharmaceutical, textile and food industries, which mainly used to produce vinyl acetate, terephthalic acid as solvent.

本项目产品符合国家产业政策，它广泛用于化工、印染、化肥、医药、纺织和食品等工业部门，它主要用途是生产醋酸乙烯，为苯二甲酸作溶剂。

Factory production of hot melt adhesive has passed SGS environmental protection certification, its main ingredient is one of ethylene vinyl acetate copolymer as the main material, adding tackifier and other ingredients together with solid-type adhesive.

本厂生产的热熔胶已通过SGS绿色环保认证，其主要成分是以乙烯一醋酸乙烯共聚物为主要材料，加入增粘剂与其它成份配合而成的固体型粘合剂。

This year the company operating the various organic chemical raw materials, varieties are: methanol, ethanol, ethylene glycol, butanol, isobutanol, isopropanol, glacial acetic acid, vinyl acetate, B lipid, Ding acetic acid lipid, styrene, toluene, phthalic anhydride, xylene, acetone, butanone, cyclohexanone, DMF, sulphuric acid, methyl isobutyl ketone, glycol Dingmi, three toluene, 2 Xin fat, melamine.

本公司常年经营各种有机化工原料，品种有：甲醇、乙醇、乙二醇、正丁醇、异丁醇、异丙醇、冰醋酸、醋酸乙烯、醋酸乙脂、醋酸丁脂、苯乙烯、甲苯、苯酐、二甲苯、丙酮、丁酮、环己酮、DMF、硫酸、甲基异丁基酮、乙二醇丁醚、三甲苯、二辛脂、三聚氰胺。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。