蛇床酞内酯及其立体异构体的合成

报道了蛇床酞内酯及其立体异构体的合成，其中格氏反应及酯交换环合反应是本合成工作的关键步骤，产物蛇床酞内酯及其立体异构体均经ＩＲ、１ＨＮＭＲ和ＭＳ鉴定     

柞蚕丝织物后整理剂的合成及应用

介绍了由聚氧乙烯甲基丙烯酸酯和硬脂酸乙二醇酯合成柞蚕丝织物后整理剂,及其在柞蚕丝织物上复合应用.     

Synthesis and Physico-Chemical Studies of Ester-Quat Surfactants in the Series of (Dodecanoyloxy)propyl n-Alkyl Dimethyl Ammonium Bromide

Ester-quat surfactants in the series of (dodecanoyl oxy) propyl n-alkyl dimethyl ammonium bromide referred to here as LC₃Cm (where m is the hydrocarbon chain lengths 8, 12 and 14) were synthesized and characterized by the usual spectroscopic methods (NMR, IR, MS…). Their physico-chemical properties were investigated by surface tension and conductimetric measurements. From surface tension measurements, isotherms and thermodynamic adsorption parameters were determined. The critical micelle concentration (CMC), the degree of counter ion dissociation (α) of micelles in the water and the standard Gibbs free energy $( \Updelta G_{\text{m}}^{0}) $ , of micellization were also determined by conductimetric measurements. The results obtained from both methods were compared to the similar surfactants in the series of quaternary ammonium surfactants. Optical microscopy was also used to study the behavior of anhydrous surfactants and the binary water/surfactant system as a function of temperature.     

Ester synthesis and hydrolysis in an aqueous environment,and strain specific changes during malolactic fermentation in wine with Oenococcus oeni

Previous work has shown that Oenococcus oeni produces esterases that are capable of hydrolysing artificial substrates. Using SPME–GCMS, this study provides evidence that purified O. oeni esterases have the ability to both synthesise and hydrolyse esters. Two purified esterases (EstA2 and EstB28) synthesised ethyl butanoate and ethyl hexanoate to varying degrees. Both purified esterases hydrolysed ethyl butanoate, ethyl hexanoate and ethyl octanoate. Once this dual activity was confirmed, malolactic fermentation (MLF) trials were conducted in wine with O. oeni strains that had been previously observed to have either high or low esterase activity against artificial substrates. Strain specific differences were observed and strains with low esterase hydrolysis activity against artificial substrates had a higher level of total esters measured after MLF. The results demonstrate the impact that O. oeni has on wine aroma and relates this to the ester hydrolysis and synthesis abilities of O. oeni strains.     

A Spherical Gas Bearing for Airborne Application

A spherical gas bearing is analyzed and tested for an airborne application. The externally pressurized bearing supports an inertially stabilized 36-in aperture, infrared telescope. The bearing provides the isolation of rotary motion from the aircraft and also serves as a seal between the aircraft cabin and cavity condition at 50, 000 ft altitude. The accompanying temperature gradient of 135 F across the 16-in diameter bearing created special design and manufacturing considerations. Test data of static load under temperature and vacuum environment were taken in support of the analysis.     

1,4-二氢吡啶类钙拮抗剂的合成法研究——(Ⅱ)尼莫地平的合成新方法

2-甲氧基乙醇、异丙醇分别与乙酰乙酸甲酯经酯交换成乙酰乙酸甲氧基乙酯(2)和乙酰乙酸异丙酯(3),(3)经氨化得3-氨基丁烯酸异丙醇酯(4)。(2)与间硝基苯甲醛缩合得间硝基亚苄基乙酰乙酸甲氧基乙酯(5),继而与(4)在原位形成的哌啶乙酸盐催化下即得尼莫地平(1),以间硝基苯甲醛计算,总收率89.1％。此法工艺简便,条件温和,适合大规模制备。     

用固体酸催化合成顺丁烯二酸二(2—乙基已)酯

本文研究用HA型固体酸催化合成顺丁烯二酸二(2-乙基己) 酯。催化剂用量为0.4克(以每摩尔马来酸酐计);在135°-145℃下将2-乙基己醇与马来酸酐加热反应(4.5小时);酯产率可达理论值的95％以上。对酯产物进行了沸点、比重、折光率的测定,还进行了元素分析、红外光谱和核磁共振谱的分析,实测结果是令人满意的。     

水溶性复合磷酸酯添加剂抗磨性能研究

合成了水溶性复合磷酸酯,利用四球试验机考察了添加到水溶液中的抗磨性能,并优化了复合磷酸酯的配比,用扫描电子显微镜对钢球磨斑形貌和摩擦表面的元素组成进行了分析,四球结果表明,磷酸酯与硫化物硫脲,油性剂油酸三乙醇胺具有良好的协同抗磨效应,并存在一个最佳配比,电镜能谱分析表明,复合磷酸酯水溶液在摩擦表面与Ｆｅ发生化学反应,生成一种含磷富硫的化学反应膜,而且表面膜中硫,磷元素的含量比为２：１时极压抗磨性能     

酯类合成油的热氧化及其状态监控技术研究进展

酯类合成油是当今应用最广泛的合成润滑油,许多润滑油生产部门和使用部门对之进行了大量的研究。酯类合成油的热氧化机理和热氧化动力学研究对于确定酯类油在实际使用情况下衰变程度和失效机理极具价值,并为酯类润滑油实施氧化寿命状态监控提供了重要依据。简要综述了近年来酯类合成油热氧化机理和热氧化动力学研究情况,以及日益受到重视的几种典型的酯类油氧化状态监控技术的发展状况。     

间氨基苯甲酸乙酯合成工艺的改进

以间氨基苯甲酸和乙醇为原料,在浓硫酸催化下反应生成间氨基苯甲酸乙酯。通过实验考察了反应时间、催化剂用量、乙醇用量对产率的影响,得出最佳反应条件为:n(间氨基苯甲酸)∶n(乙醇)∶n(硫酸)=1∶26∶2.8,回流反应8 h,产率可达到94%。改进后的工艺后处理简单、收率高、原料易得,适用于工业化生产。