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DIRECT　CONVERSION　OF　3-ACETOXYBENZOFURANS　TO　3-METHOXYBENZOFURANS

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Chinese Chemical Letters 1996年第5期7卷 419-422页

作者： Wang, ZM Liang, XT chen, sf CHINESE ACAD MED SCI INST MAT MEDBEIJING 100050PEOPLES R CHINA CHINESE ACAD MED SCI PEKING UNION MED COLLBEIJING 100050PEOPLES R CHINA CHINESE ACAD TRADIT CHINESE MED INST CHINESE MAT MEDBEIJING 100700PEOPLES R CHINA

Abstract: A direct conversion of 3-acetoxybenzofurans to 3-methoxybenzofurans was realized by refluxing in anhydrous methanolic solution containing hydrogen chloride.

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THE REVISED STRUCTURE OF GNETIFOLIN A

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Chinese Chemical Letters 1995年第8期6卷 683-686页

作者： Wang, ZM Liang, XT chen, sf Chinese Acad Med Sci Inst Mat Med Beijing 100050 Peoples R China Beijing Union Med Coll Beijing 100050 Peoples R China Chinese Acad Tradit Chinese Med Inst Chinese Mat Med Beijing 100700 Peoples R China

The structure of gnetifolin A, previously proposed as (1), was revised to (2) on the basis of the original spectra of gnetifolin A and the spectral data of its synthetic analogs.

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Total Synthesis of Gnetifolin A

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Chinese Chemical Letters 1997年第12期8卷 0-0,0-0页

作者： Huang, DF Li, L Zhang, X chen, sf Peking Union Med Coll Chinese Acad Med Sci Inst Mat Med Beijing 100050 Peoples R China

Total synthesis of gnetifolin A was accomplished via intramolecular Wittig reaction. The synthesis started from 2 -methoxy- 3 -methylhydroquinone and methyl 4-0-methylgallate through eight steps

关键词： CCU DCC DMF 甲酰胺 NBS Total Synthesis of Gnetifolin A

QUADRATIC INVARIANTS AND SYMPLECTIC STRUCTURE OF GENERAL LINEAR METHODS

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Journal of Computational Mathematics 2001年第3期19卷 269-280页

作者： Xiao, AG Li, sf Yang, M Xiangtan Univ Dept Math Xiangtan 411105 Peoples R China

Focuses on a study which presented some invariants and conservation laws of general linear methods applied to differential equation systems. Information on the quadratic invariants; Conservation of symplectic structur... 详细信息

关键词： quadratic invariants symplecticity general linear methods Hamiltonian systems

Effective management for older people with heart failure： from acute to palliative care paradigms

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Journal of Geriatric Cardiology 2016年第5期13卷 391-392页

作者： Doris sf Yu The Nethersole School of Nursing The Chinese University of Hong Kong Hong Kong China

Heart failure （HF） had emerged as an epidemic since two decades ago and is now a major threatening public health problem affecting 23 million population worldwide,

关键词： Heart failure Left ventricular assist device Palliative care Self-care Symptom cluster

A Calculation Method for Incidence and Reflection of Irregular Waves Along Seawalls

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China Ocean Engineering 1997年第3期12卷 305-314页

作者： Zhu, LS Sui, sf Chinese Acad Sci S China Sea Inst Oceanol Guangzhou 510301 Peoples R China

Some researches have been made in this aspect. In the method by Walton Jr.(1992), incident waves are supposed to be the overlapping result of M component waves with different frequencies which may take different directions, the direction of incident waves should be available in advance, but in fact the direction of incident waves is not available. In our study, incident waves are supposed to be composed of M overlapping component waves with different frequencies, and different frequencies have different directions. Based on the irregular wave reflection theory, the calculation formulas of wave direction, complex amplitude of incident waves, and complex amplitude of reflected waves in surface which are composed of component waves are derived by means of discrete Fourier transform. Then, the frequency spectra of incident waves and reflected waves and the reflection coefficient of waves with corresponding frequencies are obtained. Verification of the method and the calculation results from in-situ measured data indicate that the method is reliable and highly accurate.

关键词： irregular wave seawall incidence and reflection calculation method

Geological thermal events in Tarim Basin

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Chinese Science Bulletin 1997年第7期42卷 580-584页

作者： chen, HL Yang, sf Dong, CW Zhu, GQ Jia, CA Wei, GQ Wang, ZG Department of Earth Sciences Zhejiang University Hangzhou China Geological Research and Exploration Center Kuerle China Shanghai University Shanghai China

TARIM Basin is the biggest sedimentary basin in China, and it is also an important area of

关键词： Tarim Basin 40Ar/39Ar plateau age thermal events.

MANNICH REACTION ON 1,2-DIHYDRO-1-PYRROLIZINONE

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Chinese Chemical Letters 1996年第1期7卷 9-10页

作者： Wang, SJ Liu, FS Zhang, sf SHENYANG PHARMACEUT UNIV SHENYANG 110015PEOPLES R CHINA

The aminomethylation of the title compound can occur at 2-C or 5-C when it undergoes Mannich reaction with different amines. With aliphatic secondary amines, the reaction occurs at 2-C of the ketone, whereas with arom...

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1,3-Dipolar Cycloaddition Reaction between Vinyl Acetate and N-Alkyl Hydroxypyridinium Halide

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Chinese Chemical Letters 2001年第12期12卷 1053-1054页

作者： Zhou, sf Su, JY Zeng, LM Zhongshan Univ Sch Chem & Engn Guangzhou 510275 Peoples R China

1, 3 Dipolar cycloaddition reaction between vinyl acetate and 3-hydroxypyridiniun betaine was performed under solid-liquid phase transfer catalytic condition, This reaction has been successfully used on the synthesis ... 详细信息

关键词： 1,3-dipolar cycloaddition 3-hydroxypyridiniun betaines dipolarphiles