内地西藏班（校）高中生化学学习现状的调查与分析

以湖北武汉市西藏中学为例,调查了内地西藏班高中学生学习化学的现状,其中包括化学学习兴趣、预习情况、上课情况、作业情况、复习情况等,发现学生中存在的影响化学学习的问题,并提出了针对性的策略。     

微型实验在安徽省中学的推广状况调查分析

通过对微型实验在安徽省中学的推广情况的调查,了解到微型实验在安徽省中学的推广情况并不尽如人意。笔者对推广情况不好的原因作了深层次的分析并提出了加快微型实验在中学推广的几点建议。     

整体柱的制备及应用进展

对近期不同类型整体柱制备方面的进展情况进行了综述,概括了整体柱应用于不同色谱模式的情况,展望了整体柱的发展趋势。     

国际化学裁军核查比较试验

简要介绍了国际化学裁军核查联试的历年情况、组织与规定及我国参试的情况。列出了违禁品目录。     

工程教育认证视域下高分子材料与工程专业课程目标达成情况评价机制*——高分子化学课程目标达成情况评价

鲁东大学高分子材料与工程专业以推进新工科建设为契机、以工程教育认证为抓手,不断强化专业内涵建设和过程管理,建立了面向产出的课程目标达成情况评价机制,取得了良好效果。详述了课程目标达成情况评价机制的建立及实施方法,并以高分子化学课程目标达成情况评价为例进行阐释。     

中学化学教师听评课实施情况的调查报告

采用问卷的方式对当前福州地区教师听评课情况进行了调查分析,指出了现行听评课实施情况及存在的问题并从管理部门和教师两方面提出了建议。     

钌配合物的抗肿瘤活性研究进展*

本文对钌配合物在抗肿瘤方面的研究情况、水解过程、与DNA和蛋白质的作用情况进行了简要的评述。     

氰根与烟草过氧化物酶作用的傅里叶变换红外光谱研究

应用傅里叶变换红外光谱以及曲线拟合等技术,研究了氰根与烟草过氧化物酶同工酶Ⅱ(TOP Ⅱ)作用前后的二级结构的变化情况,定量地分析了各个二级结构的变化情况。结合氰根对TOPⅡ活性的抑制情况,从二级结构的角度解析了烟草过氧化物酶的结构与活性之间的关系。     

聚烯烃接枝改性设备的开发

介绍了近年来聚烯烃接枝工艺及其设备的开发情况。分别介绍了熔融接枝、溶液接枝、固相接枝、紫外光辐射接枝、等离子体接枝、超临界二氧化碳接枝的工艺及设备的开发情况。     

关于同系线性规律判据的讨论

从数学角度阐述了关于同系线性规律的两个判据 ,即相关系数判据与相对相关系数判据的关系 ,并从实际情况探讨了在何种情况采用哪种标准更合理     

Palladium-catalyzed asymmetric hydrosilylation of 1,3-dienes

Advances in the palladium-catalyzed asymmetric hydrosilylation of 1,3-dienes are presented according to substrate types and chiral monophosphine ligands. Chiral monodentate phosphine ligands with a binaphthyl moiety have been proven to be the most efficient ligands for cyclic 1,3-dienes, and planar chiral ferrocenylmonophosphine ligands with two ferrocenyl moieties for linear 1,3-dienes. The ferrocenylmonophosphine ligands have expanded the substrate scope to 1,3-enynes in the asymmetric hydrosilylation. Palladium-catalyzed asymmetric hydrosilylation of 1,3-dienes and 1,3-enynes leads to the stereoselective synthesis of allylsilanes and allenylsilanes, respectively.     

铜催化碳-杂原子双键不对称硅氢加成反应的研究进展

总结了近二十年来铜催化碳-杂原子双键不对称硅氢加成的研究近展, 概括了手性铜配合物催化体系催化简单酮﹑α,β-不饱和酮酯和亚胺的不对称硅氢加成, 并阐述了不对称硅氢加成的催化机理.     

Iron‐ and Cobalt‐Catalyzed Asymmetric Hydrosilylation of Ketones and Enones with Bis(oxazolinylphenyl)amine Ligands

Chiral bis(oxazolinylphenyl)amines proved to be efficient auxiliary ligands for iron and cobalt catalysts with high activity for asymmetric hydrosilylation of ketones and asymmetric conjugate hydrosilylation of enones.     

钯-手性膦配体催化剂在烯烃不对称催化反应中的应用

综述了钯-手性膦配体催化剂在烯烃的不对称氢氰化、不对称羰基化、不对称交叉偶联、不对称氢化硅氢化等方面的研究进展。参考文献36篇。     

Rhodium-catalysed asymmetric hydrosilylation of ketones using HETPHOX ligands

The HETPHOX ligand class was applied to the rhodium-catalysed asymmetric hydrosilylation of a range of substituted acetophenones. Enantioselective hydrosilylation of acetophenone with the tert-butyl substituted HETPHOX ligand gave (R)-phenylethanol in excellent enantioselectivity (84% ee) and in good conversion (80%). When applied to the hydrosilylation of other ketones conversions up to 93% and enantioselectivities up to 88% were observed.     

Convenient, enantioselective hydrosilylation of imines in protic media catalyzed by a Zn-trianglamine complex

Chiral hexamine macrocycle derived from trans-1,2-diaminocyclohexane (DACH) in a complex with diethylzinc efficiently catalyzes the asymmetric hydrosilylation of N-phosphorylated aryl-alkyl or aryl-aryl ketimines in protic media with enantiomeric excess of the product approaching 100%. The cyclic structure of the trianglamine ligand increases the enantioselectivity and/or the yield of the reaction, in comparison to the catalysis by acyclic N,N'-dibenzyl-DACH ligands. Density functional theory (DFT) computations on the structure of the model ligand-zinc complex and on the structures of the pre-organized reactants together with the calculations of possible transition states allow rationalization of the direction of the asymmetric induction of the hydrosilylation reaction. This is the first example of asymmetric catalysis of the hydrosilylation reaction of ketimines with the use of a readily available and inexpensive macrocyclic trianglamine ligand.     

Asymmetric hydrosilylation of cyclohexa-1,3-diene with trichlorosilane by palladium catalysts coordinated with chiral phosphoramidite ligands

Chiral phosphoramidite ligands prepared from (S)-binaphthol and various secondary amines were examined for the palladium-catalyzed asymmetric hydrosilylation of cyclohexa-1,3-diene with trichlorosilane. With a sterically demanding phosphoramidite bearing bis(diphenylmethyl)amine, the high enantiomeric excess of 87% was achieved, which is the highest enantioselectivity in the hydrosilylation of cyclohexadiene reported to date. The catalytic activity in the present hydrosilylation was high with all of the ligands employed, while the enantioselectivities varied dramatically depending on the dialkylamine moiety of the phosphoramidite ligand.     

Highly efficient and convenient asymmetric hydrosilylation of ketones catalyzed with zinc Schiff base complexes

Several chiral Schiff base ligands derived from α-amino acids were prepared, and zinc complexes with these chiral Schiff base ligands prepared were tested for the catalytic asymmetric hydrosilylation of ketones, and the results showed that excellent ee values were obtained, which are the prominent examples of catalytic asymmetric hydrosilylation of ketones catalyzed with zinc complexes in the presence of readily available and inexpensive α-amino acids based Schiff base ligands.     

ASYMMETRIC HYDROSILYLATION CATALYZED BY POLYMER—SUPPORTED THIAZOLIDINE RHODIUM CATALYSTS

Asymmetric hydrisilylation catalyzed by polymeric thiazolidine rhodium catalysts was conducted.Almost the same optical yields have been obtained when comb-shaped polymeric ligands and their corresponding monomer complexed rhodium cataltysts were used to asymmetric hydrosilylation of acetophenone.Optical yield of chiral 1-methylbenzyl alcohol reaches as high as 71.5%.Temperature dependence of enantioselective hydrosilylation of acetophenone was discussed.