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Manganese Dioxide with High Specific Surface Area for Alkaline Battery

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Chemical Research in Chinese Universities 2012年第5期28卷 874-877页

作者： HUANG You-ju lin yu-li li Wei-shan School of Chemistry and Environment Ministry of EducationSouth China Normal UniversityGuangzhou 510006P.R.China Key Laboratory of Electrochemical Technology on Energy Storage and Power Generation of Guangdong Higher Education Institutes Ministry of EducationSouth China Normal UniversityGuangzhou 510006P.R.China Engineering Research Center of Materials and Technology for Electrochemical Energy Storage Ministry of EducationSouth China Normal UniversityGuangzhou 510006P.R.China

The authors reported a facile method for the synthesis of manganese dioxide without any template and catalyst at a low-temperature. The prepared sample was characterized with X-ray diffraction（XRD）, scanning electron microscopy（SEM）, Brunauer-Emmett-Teller（BET） surface analysis, Fourier transform infrared（FTIR） spectrometry, cyclic voltammetry, alternative current（AC） impedance test and battery discharge test. It is found that the prepared sample belongs to α-MnO2 and has a microsphere morphology and a large BET surface area. The electrochemical characterization indicates that the prepared sample displays a larger electrochemical capacitance than the commercial electrolytic manganese dioxides（EMD） in Na2SO4 solution, and exhibits larger discharge capacity than EMD, especially at a high rate discharge condition when it is used as cathode of alkaline Zn/MnO2 battery.

关键词： Manganese dioxide Rate performance Cathode material Alkaline battery

Risk Assessment and Ecological Effects of Transgenic Bacillus thuringiensis Crops on Non-Target Organisms

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Journal of Integrative Plant Biology 2011年第7期53卷 520-538页

作者： Hui-lin yu yun-He li Kong-Ming Wu State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant Protection Chinese Academy of AgriculturalSciences Beijing 100193 China

The application of recombinant DNA technology has resulted in many insect-resistant varieties by genetic engineering （GE）. Crops expressing Cry toxins derived from Bacillus thuringiensis （Bt） have been planted worldwide, and are an effective tool for pest control. However, one ecological concern regarding the potential effects of insect-resistant GE plants on non-target organisms （NTOs） has been continually debated. In the present study, we briefly summarize the data regarding the development and commercial use of transgenic Bt varieties, elaborate on the procedure and methods for assessing the non-target effects of insect-resistant GE plants, and synthetically analyze the related research results, mostly those published between 2005 and 2010. A mass of laboratory and field studies have shown that the currently available Bt crops have no direct detrimental effects on NTOs due to their narrow spectrum of activity, and Bt crops are increasing the abundance of some beneficial insects and improving the natural control of specific pests. The use of Bt crops, such as Bt maize and Bt cotton, results in significant reductions of insecticide application and clear benefits on the environment and farmer health. Consequently, Bt crops can be a useful component of integrated pest management systems to protect the crop from targeted pests.

关键词： Bt crops non-target organisms risk assessment IPM.

First Total Synthesis of 5_α-Hydroxy-isopterocarpolone

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Chinese Chemical Letters 2001年第5期12卷 407-408页

作者： Gang ZHOU Xiao Lei GAO yu Kun GUAN Wei Dong li yu lin li National Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry Lanzhou UniversityLanzhou 730000

The first total synthesis of 5α-hydroxy-isopterocarpolone has been described.

关键词： Total synthesis 5α-hydroxy-isopterocarpolone.

Baker's Yeast Mediated Reduction of Optically Active Diketone

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Chinese Chemical Letters 2001年第4期12卷 291-292页

作者： Xiao Lei GAO Gang ZHOU yu Kun GUAN Wei Dong li yu lin li National Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry Lanzhou UniversityLanzhou 730000

Baker's Yeast mediated reduction of optically active diketone has been described.

关键词： Baker’s yeast reduction optically active diketone

Studies on the Total Synthesis of Crotocembreneic Acid and Neocrotocembreneic Acid:A Perchloric Acid-induced Lactonization Reaction of Epoxy Ester

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Chinese Chemical Letters 2000年第10期11卷 871-872页

作者： Zuo Sheng liU Jiong LAN li Zeng PENG yu lin li National Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry Lanzhou UniversityLanzhou 730000

A perchoric acid-induced lactonization reaction of epoxy ester is described. Using lithium perchlorate, the ketone is obtained in 81% yield.

关键词： lactonization crotocembreneic acid neocrotocembreneic acid synthesis

Dienone-phenol Rearrangement of C-9 Oxygenated Decalinic Dienone and Analogs through B-Ring Cleavage

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Chinese Chemical Letters 2003年第7期14卷 689-692页

作者： Jing Chun CHEN Gang ZHOU Wei Dong li yu lin li National Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry Lanzhou UniversityLanzhou 730000

Dehydrogenation of 9-hydroxy decalinic enones and analogs with DDQ resulted in a formal dienone-phenol type rearrangement via B-ring cleavage, while the corresponding dienone acetates underwent base-catalyzed formal d... 详细信息

关键词： Dienone-phenol rearrangement decalinic dienone dehydrogenation DDQ.

A Novel Access to Organostannane Compounds under Ultrasound Irradiation

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Chinese Chemical Letters 2003年第4期14卷 341-342页

作者： li Zeng PENG Tian Sheng MEI Tao ZHANG yu lin li National Laboratory of Applied Organic Chemistry&Institute of Organic Chemistry Lanzhou UniversityLanzhou 73000

A simple and efficient procedure has been developed for the synthesis of organostannane compounds by one-pot reaction of stannane halides, magnesium turnings and organic halides in the presence of 1, 2-dibromoethane u... 详细信息

关键词： Organostannane one-pot reaction ultrasound irradiation.

STUDIES ON THE STEREO-AND ENANTIOSELECTIVE SYNTHESIS OF 11.12-EPOXYSARCOPHYTOL-A,11,12-EPOXYSARCOPHYTOL-A ACETATE AND 11,12-EPOXYCEMBRENE-C.-SYNTHESIS OF 5,9,13-TRIMETHYL-2-ISOPROPYL-12(S),12(S)-EPOXY-14

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Chinese Chemical Letters 1995年第3期6卷 189-192页

作者： Xiang Jun yuE Ting Hao li yu lin li State Key Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry Lanzhou UniversityLanzhou 730000 Teaching and Research Section of Chemistry Nanjing Forestry UniverstyNanjing 210037

An efficient Synthesis of 5, 9, 13-trimethy1-2-isopropyl-12(S),13 (S)-epoxy-14-bromo-2 (Z), 4 (E). 8 (E)-tetradecatrienenitrile,a key intermediate in the synthesis of antitumor cembranoids including 11,12-epoxy-sarcophytol-A,11,12-epoxysarcophytol-A acetate and 11,12-epoxycembrene-C,was first describedthrough seven step sequence in-32% overall yield from E,E-farnesol.

关键词： 2?

The first total synthesis of ligudentatin A

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Chinese Chemical Letters 2008年第7期19卷 805-806页

作者： Chen Xi Zhang Fu Qiang Bi yu lin li State Key Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry Lanzhou University Lanzhou 730000 China

ligudentatin A 1, a new phenolic norsesquiterpenes, was first synthesized starting from （＋）-perillaldehyde 3 through five steps, successively, in an overall yield of 20.8%. The key steps were the Diels-Alder reacti... 详细信息

关键词： ligudentatin A (+)-PeriUaldehyde Diels-Alder reaction Aromatization