全文获取类型
收费全文 | 116篇 |
免费 | 2篇 |
国内免费 | 4篇 |
专业分类
化学 | 114篇 |
力学 | 1篇 |
物理学 | 7篇 |
出版年
2024年 | 1篇 |
2023年 | 22篇 |
2022年 | 2篇 |
2021年 | 9篇 |
2020年 | 7篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 5篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 1篇 |
2009年 | 10篇 |
2008年 | 4篇 |
2007年 | 9篇 |
2006年 | 4篇 |
2005年 | 7篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 6篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1992年 | 1篇 |
排序方式: 共有122条查询结果,搜索用时 15 毫秒
1.
Antonio Guirado Enrique LópezSánchez Raquel Andreu Andrés Zapata 《Tetrahedron letters》2004,45(10):2075-2076
The first method for the synthesis of the title compounds has been established involving a stereoselective electrochemical diacylation process. The cathodic reductions of monothiobenzils in an aprotic medium, under constant potential, in the presence of twofold molecular amounts of aroyl chlorides provide previously unknown (Z)-α-benzoyloxy-β-benzoythiostilbenes in high to quantitative yields. 相似文献
2.
Samuel C. Perry Pui-ki Leung Ling Wang Carlos Ponce de León 《Current Opinion in Electrochemistry》2020
CO2 reduction processes continue to be developed for electrosynthesis, energy storage applications, and environmental remediation. A number of promising materials have shown high activity and selectivity to target reduction products. However, the progress has been mainly at a small laboratory scale, and the technical challenges of large scale CO2 reduction have not been considered adequately. This review covers recent advancements in catalyst materials and cell designs. The leading materials for CO2 reduction to a number of useful products are presented with their corresponding cell and reactor designs. The latest efforts to progress to industrially relevant scales are discussed, along with the challenges that must be met for carbon dioxide reduction to be a viable route for mass scale production. 相似文献
3.
《Journal of Coordination Chemistry》2012,65(3):353-362
Crystal structures of mercury(II) complexes with a bis(tertiary phosphine selenide), namely 1,1'-methylenebis(diphenylphosphine selenide) $\{{\rm Ph_2P(Se){{\hskip -1pt -\!\!\!- \hskip-.5pt}} CH_2{{\hskip -1pt -\!\!\!- \hskip-.5pt}} P(Se)Ph_2,\ dpmSe_2}\}$ 相似文献
4.
《Comptes Rendus Chimie》2014,17(4):301-304
2-Amino-5-oxo-4,5-dihydropyrano[3,2-c]chromene-3-carbonitrile derivatives are obtained in excellent yields by a simple, mild and efficient procedure by an electrocatalytic multicomponent chain transformation of aryl aldehydes, 4-hydroxycoumarin and malononitrile under neutral and mild conditions by electrolysis in an undivided cell in the presence of sodium bromide as an electrolyte. 相似文献
5.
Adrián Serrano Mora Sean T. McBeath Clément A. Cid Michael R. Hoffmann Nigel J.D. Graham 《Current Opinion in Electrochemistry》2022
While diamond electrodes have been commonly used to generate ?OH to treat a variety of persistent water and wastewater micropollutants, mass transfer limitations and the non-selective, short-lived nature of the ?OH restrict the degradation to the solution at, or near, the electrode surface. However, diamond electrodes can generate oxidizing species that facilitate micropollutant degradation in the bulk water solution. These include persulfate, sulfate radicals, peroxodiphosphate, ferrate, permanganate, reactive chlorine species, hydrogen peroxide, and ozone, which have been reported during electrochemical treatment of water with diamond electrodes. Although still restricted to specialized applications, recent studies, summarized in this review, have proven the electrogeneration of these additional oxidant species to be effective. They have shown the adaptability and potential of diamond electrode-based water treatment to mitigate the presence of micropollutants in water. 相似文献
6.
YU Jian-guo CAO Xue-jing ZHANG Heng-bin ZHANG Yu-min LI Ke-chang 《高等学校化学研究》2006,22(5):626-630
IntroductionHydroxypivalaldehyde(HPAL)has two activefunctional groups,aldehyde and alcohol.The directelectrooxidation of alcohol or aldehyde has been repor-ted,such as the electrooxidations of croton aldehyde,benzaldehyde[1],and benzyl alcohol[2—4].Howev… 相似文献
7.
The importance of cell design to the development of convenient, laboratory organic electrosyntheses, popular with synthetic chemists, is highlighted. Although also influencing reaction selectivity, the cell design is the major factor determining the rate of conversion of reactant to product, the final conversion that can be achieved and the quantity of product formed. The recent literature contains a number of designs of flow electrolysis cells for electrosynthesis with examples of their application. 相似文献
8.
Hui Xu Dr. Shengbo Zhang Xinyuan Zhang Min Xu Dr. Miaomiao Han Prof. Li Rong Zheng Prof. Yunxia Zhang Prof. Guozhong Wang Prof. Haimin Zhang Prof. Huijun Zhao 《Angewandte Chemie (International ed. in English)》2023,62(52):e202314414
The integration of highly active single atoms (SAs) and atom clusters (ACs) into an electrocatalyst is critically important for high-efficiency two-electron oxygen reduction reaction (2e− ORR) to hydrogen peroxide (H2O2). Here we report a tandem impregnation-pyrolysis-etching strategy to fabricate the oxygen-coordinated Fe SAs and ACs anchored on bacterial cellulose-derived carbon (BCC) (FeSAs/ACs-BCC). As the electrocatalyst, FeSAs/ACs-BCC exhibits superior electrocatalytic activity and selectivity toward 2e− ORR, affording an onset potential of 0.78 V (vs. RHE) and a high H2O2 selectivity of 96.5 % in 0.1 M KOH. In a flow cell reactor, the FeSAs/ACs-BCC also achieves high-efficiency H2O2 production with a yield rate of 12.51±0.18 mol gcat−1 h−1 and a faradaic efficiency of 89.4 %±1.3 % at 150 mA cm−2. Additionally, the feasibility of coupling the produced H2O2 and electro-Fenton process for the valorization of ethylene glycol was explored in detail. The theoretical calculations uncover that the oxygen-coordinated Fe SAs effectively regulate the electronic structure of Fe ACs which are the 2e− ORR active sites, resulting in the optimal binding strength of *OOH intermediate for high-efficiency H2O2 production. 相似文献
9.
《中国化学快报》2020,31(6):1576-1579
Reported herein is the first example of electrochemical selenocyanation of imidazo[1,5-a]quinolines with KSeCN under metal catalyst-and chemical oxidant-free conditions.This sustainable strategy shows a broad scope and great compatibility with functional groups,and affords synthetically and biologically important selenocyanated imidazo[1,5-a]quinolines in good to excellent yields with cheap graphite and Ni plates as the electrodes.The gram-scale synthesis was also successfully conducted,which might demonstrate the potential value of this electrochemical protocol. 相似文献
10.
Eric Quarez 《Journal of solid state chemistry》2003,176(1):137-150
The new Ba6Ru2Na2X2O17 (X=V, Mn) compounds have been prepared by electrosynthesis in molten NaOH and their crystal structures have been refined from single crystals X-ray diffraction, space group P63/mmc, Z=2, for X=V: , , R1=4.76%, for X=Mn : , , R1=3.48%. The crystal structure is a 12H-type perovskite with a (c′cchcc)2 stacking sequence of [BaO3]c, [BaO3]h and [BaO2]c′ layers. The tridimensional edifice is formed by blocks of Ru2O9 dimers that share corners with NaO6 octahedra. These blocks sandwich double sheets of X5+O4 tetrahedra. Several isotypic Ba6M5+2Na2X5+2O17 materials (X=V, Cr, Mn, P, As) and (M=Ru, Nb, Ta, Sb) have been prepared by solid state reaction and characterized by Rietveld analysis. The magnetic and electric properties have been investigated and show besides the Ru5+2O9 typical intradimer antiferromagnetic couplings, discrepancies of both χ and ρ versus T at 50 and 100 K for Ba6Ru2Na2X2O17 (X=V, As). In this work, a review of the identified Ru-hexagonal perovskite materials is also reported in order to overview the wide variety of possibilities in the field of new compounds synthesis. 相似文献