中学化学教学中学习情境创设的途径及启示

通过查阅国内期刊中关于情境创设的研究,综述了国内中学化学情境创设的基本途径,从学生兴趣和思维、学习内容、学习方式、学生活动以及多媒体技术这5个方面进行讨论,同时查阅近几年美国《化学教育》(journal of chemical education)里关于学习情境(learning environment)的文章,介绍几种国外学习情境创设的类型。从中得到了一些启示。     

中学化学复习中尝试“主题教学”的探索

复习教学在中学化学教学中有着重要的地位,对学生化学学习起着总结、提升的作用,是提高教学质量的重要环节。针对传统高中化学复习教学中存在的问题,尝试以“课程内容主题化、主题内容情境化、情境内容问题化、情境问题解决互动化、能力迁移与知识活化”的主题教学复习方法,解决教学中的问题,提高化学复习效益。     

《梦溪笔谈》融入中学化学教学的探索

尝试将《梦溪笔谈》融入中学化学教学,将该著作中《巫咸河》《沈卢鱼肠》《石油》《胆矾炼铜》与胶体、合金、石油的分馏、置换反应等化学知识结合,以问题情境导入和试题编制等形式,帮助学生理解化学知识,培养综合素质,“润物细无声”地传承优秀传统文化。     

研究期刊感悟高考启迪复习——源于《化学教育》的2006年高考试题评析与启示

《化学教育》开设的“生活中的化学”、“化学与社会”、“知识介绍”等栏目为中学化学教学提供了丰富鲜活的知识,开阔了读者视野,激活了中学化学基础知识,同时为高考命题提供了素材。笔者研究2006年高考化学试题,发现部分试题选材源于《化学教育》,这对引导中学化学老师研究《     

真实情境与化学学科核心素养的发展——基于《普通高中化学课程标准(2017年版)》的解读

《普通高中化学课程标准（2017年版）》构建了化学学科核心素养的内容体系及其发展水平框架,重视开展“素养为本”的教学,重视真实情境的创设。在分析教学情境的内涵与功能的基础上,解读了新课标中课程内容、实施建议和命题原则中对真实情境创设与应用的要求,讨论了真实情境在发展学生化学学科核心素养中的教育价值。通过对具体教学案例的分析,探讨了基于学生化学学科核心素养发展的教学情境设计的策略。     

教学有"情""情"可有源——从教学能手大赛谈化学教学情境

新课程倡导创设生动活泼的教学情境,激发学生学习情趣,促使学生主动学习.结合观摩"江西省首届中学化学教师教学能手大赛",基于新课程理念,阐述化学情境教学的特点以及化学教学情境创设的原则和基本途径.     

《义务教育化学课程标准(2022年版)》解读——科学探究与化学实验

分析了《义务教育化学课程标准(2022年版)》学习主题1“科学探究与化学实验”的内容结构及核心素养发展的功能定位,阐述了该学习主题的内容要求及主要变化,解读了素养导向的学业要求,并阐述了主题1的教学提示,为教师教学提供了教学策略建议、学习活动建议和情境素材建议,促进教师积极开展学习主题1教学的新探索。     

中学化学中化学史教学的现状调查与思考

化学史知识不仅是中学化学教学的重要组成部分,也是中学化学学科素质教育的重要素材,并以其内容的独特性,在素质教育中发挥着特殊的作用,通过对现行教材及化学史教学的现状调查分析和研究,旨在充分发挥化学史在素质教育中的作用,为进一步探讨中学化学中化学史教学的内容和形式提供依据。     

美国中学化学教材中情境创设的分析与启示

美国主流理科教材《化学:概念与应用》以化学核心概念为主题,创设了丰富的学习情境。以该教材中"水和溶液"这一章创设的情境为例,讨论该教材中情境的类型、功能及呈现方式,为国内化学教材情境的创设提供建议。     

“废旧电池污染”研究性学习的实施与反思

结合指导学生开展“废旧电池污染”的研究性学习案例,探索了创设多样化的研究性学习的教学情境、实践活动和校本课程从而激活化学课堂的途径,并就中学化学教学与研究性学习的整合进行了反思。     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.