丙炔

In this thesis, the advantages and disadvantages of potentiodynamic polarization curve, electrochemical impedance spectroscope and coulostatic method for studying corrosion inhibitors in acidic mediums were compared. And then the effect of three popular acid corrosion inhibitors such as thiourea, dodecylamine and propargyl alcohol on the corrosion inhibition behaviors of Q235 steel in acidic solutions were investigated by these techniques. The anodic desorption behavior and extreme value phenomenon of concentration were surveyed thoroughly as well.

本文讨论了动电位极化曲线、电化学阻抗谱和恒电量测量方法在酸性介质缓蚀剂研究中的优势和不足，在此基础上，研究了硫脲、十二胺和丙炔醇等三种常见酸性介质缓蚀剂对Q235钢在酸性溶液中的缓蚀行为和机理，并深入探讨了缓蚀剂的阳极脱附和浓度极值现象。

The electrochemical results of Q235 steel clearly showed that, dodecylamine restrain corrosion mainly by geometric blocking effect; Thiourea decreased the cathodic current effectively and propargyl alcohol suppressed the anodic reaction instead. Inhibition behaviors of PA at different concentrations were investigated as well.

Q235钢在酸性介质缓蚀剂中的电化学结果表明，十二胺以覆盖效应为主，硫脲则主要抑制Q235钢的阴极过程，而丙炔醇属于以抑制阳极反应为主的缓蚀剂。

From the starting material: propargyl alcohol, the building block was prepared easily by Jones oxidation, esterfication, bromination and selective trifluoromethylation.

第一部分：从丙炔醇出发，经过Jones氧化，甲酯化，顺式二溴化，再选择性地在酯基的β位实现三氟甲基化，合成了目标含氟砌块。

Optically active propargylic alcohols are very useful and important precursors to many chiral organic compounds including natural products, pharmaceutical compounds and macromolecules.

手性丙炔醇是非常重要的合成中间体，广泛应用于天然产物、药物以及复杂大分子化合物等的合成。

This thesis mainly focuses on overcoming the substrates limition of the present catalytic systems,low catalytic efficiency,and application in total synthesis.1.Conveniently synthesized sulfonamide alcohol titanium complex has been used to catalyze the asymmetric addtition of methyl propiolate to various aromatic and aliphatic aldehydes with high enantioselectivity.

本论文即针对现有催化体系的底物局限性、催化效率低、应用研究少等展开研究：1、我们将简便合成的磺酰胺基醇配体-钛催化体系应用于催化丙炔酸甲酯对各类芳香醛及脂肪醛的不对称加成取得了理想的结果。

A(C2H5)3N·HCl-induced palladium complex PdL2Cl2 and CuCl2 catalyzed cyclotrimerization reaction of Ethyl Propiolate has been reported for the first time.

报道了一类三乙胺盐酸盐存在下钯PdL2Cl2-CuCl2催化体系催化的丙炔酸乙酯(Ethyl Propiolate，简称EP)环三聚反应。

Their corrosion inhibition action of stainless steel in hydrofluoric acid is studied by adsorption theory and electrochemical polarization-curve method,the mechanism of corrosion inhibition action is analyzed.the result shows that the single molecule layer of these compounds is adsorbed on the surface of the stainless steel and followed Langmuir isothermal equation. the adsorption procedure of propiolic alcohol is endothermic reaction, the adsorption ability and corrosion inhibition efficiency increased when temperature rised. The adsorption procedure of other three compounds are all exothermic reaction , the adsorption ability and corrosion inhibition efficiency decreased when temperature increased.

实验结果表明：这几种物质在不锈钢表面产生单分子层吸附，并且满足Langmuir吸附规律，丙炔醇的吸附过程为吸热反应，随着温度的升高，吸附能力增强，缓蚀率升高；其它三种化合物的吸附过程均为放热反应，温度升高，吸附能力下降，缓蚀率降低。

Theoretic studies on dissociation of propyne at 157 nm were performed.

从头算方法对丙炔在157nm光照下的一个光分解途径C3H4→CH3+C2H进行计算研究。

Theoretic studies on dissociation of propyne at 157 nm were performed.

用从头算方法对丙炔在157nm光照下的一个光分解途径C3H4→CH3+C2H进行计算研究。

In order to discuss the regioselectivity of nitrile oxide 1,3-dipolar cycloaddition to propyne , 1,3-dipolar cycloaddition reaction of substituted nitrile oxide (RCNO, R=F, NO2, OCH3, OH, COOCH3, CHO, CONH2, H, CH3) with propyne was studied using density functional theory at the 6-311++G** level, and the reaction rates were calculated at different temperature from 200 to 400 K.

用密度泛函B3LYP/6-311++G**方法研究了氧化腈(RCNO，R=F，NO2，OCH3，OH，COOCH3，CHO，CONH2，H，CH3)与丙炔的1，3-偶极环加成反应，并且计算了不同温度下的反应速率常数，讨论了氧化腈上不同取代基R的取代效应和温度对反应区域选择性的影响。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。