Copper methanesulfonate-acetic acid as a novel catalytic system for tetrahydropyranylation of alcohols and phenols

A synergistic catalytic effect between copper methanesulfonate and acetic acid in tetrahydropyranylation of alcohols and phenol at room temperature under solvent free condition has been described. Both alcohols (primary, secondary and tertiary) and phenols reacted with 3,4-dihydro-2H-pyran smoothly to afford the corresponding tetrahydropyranyl ethers in good yields.     

EFFECT OF WEAK INTERACTIONS ON PHENOL ADSORPTION FROM AQUEOUS SOLUTIONS BY AMINATED POLYMERIC ADSORBENTS

Adsorption behaviors of phenol from aqueous solutions have been investigated in batch systems at 303 K and 318 K respectively, using hypercrosslinked polymeric adsorbent （CHA111）, aminated hypercrosslinked polymeric adsorbents （NDA101, NDA103, NDA105） and weakly basic polymeric adsorbent （D301） with a view to studying the effect of hydrogen bonding and Van der Waals interactions between adsorbate and the adsorbent. All adsorption isotherms can be well fitted by Langmuir and Freundlich equations. Compared with D301 driven by hydrogen bonding interaction only and CHA111 driven by Van der Waals interaction only, phenol adsorption on aminated adsorbents driven by both hydrogen bonding and Van der Waals interactions were apparently different, i.e., negative effect for NDA105, positive effect for NDA101 and synergistic effect for NDA103. In this synergistic action, some weak interactions would contribute more or less to the adsorption than they work individually.     

对一道高考题的思考与拓宽

高考题具有很强的代表性和示范性，对高考题进行多变探索，挖掘潜在价值，延伸拓展，有利于避免“题海”战术，减负增效，也有利于拓展想象力，激发创造活力，提高思维的灵活性和实效性．本文对一道典型的高考题展开发散思考，并对此题进一步延伸拓展．     

初读《微型无机化学实验》

在全面推进素质教育、全国一片减负声的情势下,新编《微型无机化学实验》一书出版了,可喜可贺。期望该书在提高化学实验教学质量中起到积极的作用。     

C12BE-SDS-TX-10三元表面活性剂非理想溶液复配增效作用

C12BE-SDS-TX-10三元表面活性剂非理想溶液复配增效作用;表面活性剂;三元;增效作用;非理想溶液;复配     

增效试剂对过氧化物模拟酶催化显色体系的增效作用——Fe—TPPS4—4—AAP—苯酚

本以β－环糊精（β－ＣＤ）和表面活性剂为增效剂，分别研究了它们对以Ｆｅ－ｍｅｓｏ－（四（４－磺基苯）卟啉）（Ｆｅ－ＴＰＰＳ４）为催化剂，催化过氧化氢氧化４－氨基安替比林（４－ＡＡＰ）与苯酚衍生物显色反应的速度和灵敏度的影响，发现β－ＣＤ和十二烷基苯磺酸钠（ＳＤＢＳ）对该体系具有明显的增效作用，在３×１０＾－３ｍｏｌ／Ｌβ－ＣＤ存在下，测定Ｈ２Ｏ的灵敏度比献报道的提高了１．５６倍，利用ＳＤＢＳ深     

修饰基团的结构对β-环糊精衍生物的分析特性的影响--Ⅰ可离解基团的影响

本文以螯合阳离子、螯合阴离子和具有阴、阳电性互变异构体的三种类型的显色体系为例,比较研究了未经修饰的β－环糊精（β－ＣＤ）与经荷阴离子、阳离子取代基修饰的β－ＣＤ衍生物对这三种类型显色体系的增效作用的机理,总结出这些衍生物对显色反应作用的规律．     

β-氨基酸聚合物用于协同增效逆转白色念珠菌对伊曲康唑的耐药性

设计合成了与伊曲康唑具有协同活性的系列β-氨基酸聚合物。通过β-氨基酸N-硫代羧基酸酐(β-NTA)开环聚合的方法,将不同比例疏水性单体DL-β-正亮氨酸N-羧基硫代羰基环内酸酐(简称Bu)和阳离子单体N(α)-Z-DL-2,3-二氨基丙酸N-羧基硫代羰基环内酸酐(简称DAP)进行共聚,得到了系列β-氨基酸聚合物(DAP_xBu_y)_n。抗菌测试表明,制备的(DAP_xBu_y)_n聚合物可通过协同增效,有效逆转白色念珠菌(C.albicans)对伊曲康唑的耐药性,使伊曲康唑的抗真菌最低抑制质量浓度从单药的大于200μg/mL降低至协同后的3.1μg/mL,即从无效逆转为高效抗真菌活性。此外,(DAP_xBu_y)_n聚合物在400μg/mL的高浓度下基本没有造成明显的人血红细胞溶血和细胞毒性。(DAP_xBu_y)_n聚合物能实现高效协同增效和逆...