碳酸铯催化下端炔碘化合成炔基碘

催化量的碳酸铯(0.2 equiv.)、氢氧化钾(2.0 equiv.)及端炔(1.0 equiv.)在无水THF-HMPA中, 室温搅拌3 h, 然后加入碘的THF溶液, 室温搅拌2 h, 生成炔基碘. 产率为70%～93%.     

一种测定硫铁矿中二氧化碳含量的装置及方法

<正>申请公布号:CN104198327A申请公布日:2014.12.10申请人:中蓝连海设计研究院摘要本发明是一种测定硫铁矿中二氧化碳含量的方法,属于化学分析测定领域,主要步骤:将试样与含有3%硫酸铜的磷酸溶液反应,释放出二氧化碳气体,通过稀酸溶液的驱排,将气体聚集在量气管中,在吸收器中,用40%氢氧化钾溶液吸收其中的二氧化碳气体,测量吸收前后的气体体积     

AuCl4-H2O2化学发光体系研究

本文发现, AuCl4^-在KOH和H2O2存在下会产生弱化学发光信号; 在此基础上建立了AuCl4^-H2O2-KOH-CTMAB体系测定金的新的简单的化学发光分析法; 方法的检测限为5.5ppbAn; 线性范围为10-800pph; 测定100ppb金溶液的相对标准偏差为6.5%; 并初步探讨了AuCl4^-化学发光的可能过程及表面活性剂的影响作用。     

Shape-Controlled Synthesis and Related Growth Mechanism of Pb（OH）2 Nanorods by Solution-Phase Reaction

We present a simple method to synthesize Pb（OH）2 nanorods by solution-phase reaction. Rod-like lead hydroxide precipitates are obtained by mixing lead nitrate with a concentration of about 0.01 M and potassium hydroxide with concentration of about O.03 M in an aqueous solution. Sodium chloride as an additive is premixed with the lead nitrate aqueous solution. The presence of chloride ions in the precursor solution results in the rod-like morphology of lead hydroxide precipitates. The growth mechanism of the lead hydroxide nanorods is discussed.     

Rearrangement of 2—Benzothiazolylthioacetyl hidrazide in Ethanol Solution of Potassium Hydroxide：Synthesis of s—Triazolo[3,4—b] benzothiazol—3—thiol and Its Derivatives

A novel rearrangement reaction about 2-benzothiazolylthioacetyl hydrazide (1) to produce s-triazolo[3,4-b] benzothiazol-3-thiol (3) in the presence of KOH and CS2 was described.Other way to synthesize 3 from 2-benzothiazolyl-hydrazine (2) under the same condition was compared and the Mannich reaction of compound 3 was reported too.Their structures were established by elemental analyses,IR,^1H nmr and MS spectra.     

锌电极在氢氧化钾溶液中阳极惰化时的表面相变的研究

本文试图进一步从动力学方面证明恒电位下的锌电极在KOH溶液中阳极惰化时,阳极溶解电流随时间而缓慢下降是由于“表面相变”所引起。用恒电位法测取了锌电极在不同浓度的KOH溶液中电流对时间的曲线。实验结果与推导的动力学方程式相符,表明在恒电位惰化条件下,锌电极表面上最初形成的[Zn(OH)_2]_(ad)在OH~-参预下徐缓地转变为较不易溶的[ZnO]_(ad),因而导致阳极溶解电流的下降。这一表面相变过程可表示如下:     

镧系元素的电子转移反应（Ⅰ）：—Ln（Ⅳ）IO^—6在KOH水溶液中还原反应的动力学和机理

研究了Pr(Ⅳ）,Tb(Ⅳ）高碘酸根配合物的L→M电荷迁移跃迁，利用紫外－可见分光光度计探讨了配合物阴离子在KOH水溶液中自还原反应的动力学规律，测出了电子转移反应过程的动力学参数。根据实验现象及测定结果推Ln(Ⅳ）IO^-6配离子在水溶液中自还原反应的机理，并对其进行了验证。     

多取代异噁唑类化合物的合成

异噁唑是一类具有独特化学结构的杂环类化合物,具有广泛的生物活性和药物活性,在医药、农药以及有机合成等方面具有非常广泛的应用前景。目前,对该类化合物的合成与生物活性的研究是合成化学研究热点之一。本论文主要是由α-烷硫亚甲基-β-肟类化合物和氢氧化钾在DMF溶剂中合成了一系列多取代异噁唑类化合物,通过~1H NMR,~(13)C NMR和ESI-MS(ESI-TOF)对所得化合物结构进行了表征。以2a的合成为例,对反应条件进行了优化,结果表明:在最优化化条件[(1a)1 mmol,氢氧化钾2 mmol,DMF 5 mL,80℃条件下,反应20 h],2a产率91%。并对该反应机理进行了探讨。该合成方法具有操作简单,条件温和以及产率高等特点。     

Characterization of Microporous Activated Carbon Electrodes for Electric Double-layer Capacitors

IntroductionElectric double layer capacitors( EDLCs) witha high power density can be used as memory back-up devices or electric vehicles.EDLCs store energyin the electric double layer by charge accumulationon the interface between the electrode and the elec-trolyte. In order to obtain reasonable energies andpower densities,the more suitable material forEDLCs musthave a high surface area with a signif-icant value of specific double layer capacitance,better pore size distribution and electro…     

Synthesis of Dimethyl Carbonate from Methanol and Carbon Dioxide Catalyzed by Potassium Hydroxide under Mild Conditions

The synthesis of dimethyl carbonate （DMC） from methanol and carbon dioxide using potassium hydroxide as catalyst in the presence of CH3I and the effect of ionic liquid on the reaction were investigated. The results showed that KOH is an effective catalyst; the high selectivity and raised yield of DMC formation under mild conditions were achieved. However, the addition of the ionic liquid, l-ethyl-3-methylimidazolium bromide （emimBr）, can evidently accelerate the conversion of methanol and yield of the product.