Four novel bridged dianilines containing fluorine were synthesized using 4-chloro-3, 5-dinitrobenzotrifluoride and diamine by two step condensation and reduction. The structures of corresponding compounds were determined by means of IR, NMR and elemental analysis.
[Qingyun Tang; Xinxiang Luo; Ruiming Wen] Department of Chemistry and Environmental Engineering , Hunan City University , Yiyang, Peoples Republic of China
[Tang, QY] Hunan City Univ, Dept Environm Chem & Engn, Yiyang 413049, Peoples R China.;Department of Chemistry and Environmental Engineering , Hunan City University , Yiyang, Peoples Republic of China
A heteropolyanion‐containing polypyrrole/carbon nanotube modified electrode has been fabricated through entrapment of phosphomolybdic acid (H3PMo12O40) in polypyrrole (PPy) film on multi‐walled carbon nanotubes (MWNTs) modified gold electrode. The electrochemical behavior and the electrocatalytic property of the modified electrode were investigated in acidic solution. Compared with the H3PMo12O40/PPy/gold electrode, the H3PMo12O40/PPy/MWNTs/gold electrode has s hown enhanced electrocatalytic property to the reduction of nitrite. Steady‐state amperometry has been applied to characterize the modified electrode as an amperometric sensor for the determination of nitrite. Effects of PPy film thickness and MWNTs concentration on the current response of the modified electrode for the detection of nitrite have been investigated and discussed. Under the optimized conditions, a linear range from 5.0×10−6 to 3.4×10−2 M has been observed for the H3PMo12O40/PPy/MWNTs/gold electrode with a sensitivity of 1214.1 mA M−1 cm−2 and a detection limit of 1.0×10−6 M according to a signal‐to‐noise ratio of 3.
Science China Chemistry,2010年53(5):1095-1101 ISSN：1674-7291
[Hu, Lin; Shan, ZiXing; Hu, XiaoYun] Department of Chemistry, Wuhan University, Wuhan 430072, China;[Luo, XinXiang] Department of Chemistry and Environment Engineering, Hunan City University, Yiyang 413049, China
n-butyl p-hydroxybenzoate was synthesized by the esterification of n-Butyl alcohol with p-hydroxybenzoic acid in the presence of sodium bisulfate monohydrate. The results obtained indicate that sodium bisulfate monohydrate possesses a fairly high catalytic activity for the esterification reaction. The molar ratio of p-hydroxybenzoic acid/n-butyl alcohol and the effect of the amount of catalyst used and the reaction time on the yield of ester have been studied. The yield of the ester obtained under the typical reaction conditions (p-hydroxybenzoic acid/n-butyl alcohol/ sodium bisulfate = 1 mol/ 2 mol /0.072 mol, refluxing and water-segrating for 5 h) is 92.8%. Sodium bisulfate monohydrate catalyst can be easily recovered and reused.
Benzil is an important photosensitive initiator of organic synthesis intermediates,medicinal intermediates and ultraviolet solidified resin (UVresin),and is usually prepared by oxidizing benzoin, The oxidizers and methods reported are mainly;(PhCH_2Et_3N)~+Br~-/(PhCO)_2O_2/MeCN~,DMSO/(COCL)_2 CH_2CL_2~,CrO_3·CH_3NH_2·HCl/Al_2O_3~, the metallorganic compound~,microwave radiation~,etc.The reaction conditions of some methods are harsh, the toxicity is heavy, the reaction reagent is expensive, the preparation is difficult, the aftertreatment is tedious or the conversion ratio of materials is low.Cupric compound is a kind of weak oxidizer.Up till now there is only the report of oxidizing benzoin with cupric sulfate-pyridine~ with cupric acetate-acetic acid~.This paper studies the problem of oxidizing benzoin by using cupric nitrate, cupric chloride, cupric sulfate,cupric acetate and cupric subcarbonate as oxidizers.The experimental results indicate that these cupric compounds can all oxidize benzoin into benzil in acetic acid solutions, and cupric nitrate is the best one.Its product has these adventages of fine color and luster,high yield, available raw material and simple and easy operation and it has the prospects of being used widely.