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STUDIES ON THE SYNTHESIS OF ISOSARCOPHYTOL-A

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Chinese Chemical Letters 1991年第1期2卷 7-8页

作者： Yu-Lin LI Wei-Dong LI Ying LI Laboratory of Applied Organic Chemistry,Institute of Organic Chemistry,lanzhou university,lanzhou 730000

A precursor 9 of isosarcophytol-A(1)was prepared from(■)-farnesol(3)through 6 ***-A(1),a cembrane-type diterpenoid,was first isolated fromustralian soft coral(Nephthea brassica)in 1982,and its structure was estab-shed as(1,3,7,11-all ■,13■)-cembra-1,3,7,11-tetraen-13-ol,an isomer ofarcophytol-A■.As far as we know,its bioactivity and synthesis have noteen reported yet.

关键词： STUDIES ON THE SYNTHESIS OF ISOSARCOPHYTOL-A

STUDIES ON THE PRENYLFLAVONOIDS PART *** OF(±)LESPEDEZAFLAVANONE D

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Chinese Chemical Letters 1993年第4期4卷 283-284页

作者： Fang Jie ZHANG Hua Wu SHAO Yu Lin LI Satate key Laboratory of Applied Organic Chemistry,lanzhou university,lanzhou 730000

(±)Lespedezaflavanone D,8,5'-di(γ,γ-dimethylallyl)-5,7,2',4'-tetrahydroxyflavanone,has been synthesized by the condensation of 4,6-dimethoxymethoxy-3-(γ,γ-dimethylallyl)-2-hydroxy- acetophenone with 2,4-dimethoxy... 详细信息

关键词： LESPEDEZAFLAVANONE D STUDIES ON THE PRENYLFLAVONOIDS PART V.SYNTHESIS OF ppm Wang FAB

STUDIES　ON　THE　SYNTHESIS　OF　SINULARIOL－D，　SINULARIOL－A　AND　SINULARIC　ACID－A．－SYNTHESIS　OF　（5R）－7，7－DIMETHOXY－5－［1－（2－TERT－BUTYLDIPHENYLSILOXYMETHYL）VINYL］－2－HEPTANONE

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Chinese Chemical Letters 1994年第7期5卷 563-564页

作者： Xiang Jun YUE Yu Lin LI(The State Key Laboraory of Applied Organic Chemistry and Institute of Organic Chemistry,lanzhou university ,lanzhou 730000)

An efficient synthesis of (5R)-7. 7-dimethoxy-5-[1-(2-tert-butyldiphenylsiloxymethyl)vinyl]-2-heptanone, a key intermediate in the synthesis of antitumor cembrane type sinulariol-D,sinularial A and sinularic acid-A is... 详细信息

关键词： TERT BUTYLDIPHENYLSILOXYMETHYL SINULARIC ON STUDIES OF SINULARIOL VINYL ACID AND

GLOBAL ATTRACTIVITY IN A CLASS OF HIGHER-ORDER NONLINEAR DIFFERENCE EQUATION

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Acta Mathematica Scientia 2005年第1期25卷 59-66页

作者：李万同张艳红苏有慧 Department of Mathematics lanzhou university Lanzhou 730000 China Department of Mathematics lanzhou university Lanzhou 730000 China Department of Mathematics Hexi University Zhangye 734000 China

In this paper the global attractivity of the nonlinear difference equationis investigated, where a,b, A ∈ (0,∞), k is an positive integer and the initial conditions x- k, …, x-1 and x0 are arbitrary positive numbers. It is shown that the unique positive equilibrium of the equation is global attractive. As a corollary, the result gives a positive confirmation on the conjecture presented by Kocic and Ladas [1,p154].

关键词： Difference equation global attractivity stability equilibrium.

Reduction of o- and p-Bromomethylbenzylidenemalononitrile by1-Benzyl-1,4-dihydronicotinamide

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Chinese Chemical Letters 1999年第8期10卷 633-636页

作者： Hong Yi WANG You Cheng LIU Jin Zhi CHEN Qing Xiang GUO(Department of Chemistry, university of Science and Technology of China, Hefei 230026)(National Laboratory of Applied Organic Chemistry and Department of Chemistry ,lanzhou university, lanzhou 730 Univ Sci & Technol China Dept Chem Hefei 230026 Peoples R China lanzhou Univ Natl Lab Appl Organ Chem Lanzhou 730000 Peoples R China lanzhou Univ Dept Chem Lanzhou 730000 Peoples R China

o-Bromomethylbenzylidenemalononitrile 4 is reduced by 1-benzyl-1,4-dihydronicotinamide (BNAH, 1) to give 2,2-indanedicarbonitrile 6 and p-bromomethylbenzylidenemalononitrile 5 is reduced by BNAH to give 7 and 8 by hyd... 详细信息

关键词： o- and p-bromomethylbenzylidenemalononitrile 1-benzyl-1,4-dihydronicotinamide hydride transfer mechanism

STUDIES　ON　THE　PRENYLFLAVONOIDS　PART　X　Ⅳ　SYNTHESIS　OF　3′－METHOXY－5′－PRENYLNARINGENIN

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Chinese Chemical Letters 1995年第5期6卷 367-368页

作者： Lian Yun ZHAO Xian Yong BU Yu Lin LI(State Key laboratory of Applied Organic Chemistry, lanzhou university, lanzhou 730000)

Methoxy-5′-prenylnaringenin was first synthesized via the condensation of 2-hydroxy- 4, 6-dimethoxymethoxyacetophenone with 3 - methoxy - 4 - methoxymethoxy- 5- prenylbenzaldehyde followed by cyclization and demet...

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Ground State Structure of Hs Super-heavy Isotopes

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原子核物理评论 2009年第S1期26卷 175-180页

作者： MA Long1,ZHOU Xiao-hong1,ZHANG Hong-fei2,GAN Zai-guo1, LI Jun-qing1,3 (1 Institute of Modern Physics,Chinese Academy of Sciences,lanzhou 730000,China 2 School of Nuclear Science and Technology,lanzhou university,lanzhou 730000,China 3 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Research Facility in lanzhou,lanzhou 730000,China) Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China

The ground state properties of Hs nuclei studied in the framework of the relativistic mean field theory revealed that more stable isotopes are located on the proton abundant side of the chain. The last stable nucleus to the proton drip line is 256Hs. The most stable unknown Hs nucleus may be 268Hs. The density dependent delta interaction pairing is used to improve the BCS pairing correction,which results in more reasonable single-particle energy level distributions and nucleon occupation,and it is shown to be available to describe the properties of nuclei in the superheavy region.

关键词： superheavy nucleus nuclear structure pairing

TRAVELLING FRONT SOLUTIONS IN A DIFFUSIVE VECTOR DISEASE MODEL WITH SPATIO-TEMPORAL DELAY

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Annals of Differential Equations 2012年第4期28卷 471-479页

作者： Cunhua Zhang Dept.of Math.,lanzhou Jiaotong university,lanzhou 730070

This paper is concerned with travelling front solutions to a vector disease model with a spatio-temporal delay incorporated as an integral convolution over all the past time up to now and the whole one-dimensional spatial domain *** the delay kernel is assumed to be the strong generic kernel,using the linear chain techniques and the geometric singular perturbation theory,the existence of travelling front solutions is shown for small delay.

关键词： diffusive vector disease model nonlocal delay strong generic kernel travelling wave fronts

STUDIES　ON　THE　PRENYLFLAVOIDS　PART　Ⅹ　Ⅵ　SYNTHESIS　OF　（±）－3＇，　4＇－METHYLENEDIOXYISODERICINE－A　AND　（±）－PONGAPINONE－B

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Chinese Chemical Letters 1995年第10期6卷 853-854页

作者： Xian Yong BU Lian Yun ZHAO and Yu Lin LI(State Key Laboratory of Applied Organic Chemistry, lanzhou university,lanzhou 730000)

Methylenedloxyisodericine-A and pongapinone-B were first synthesized via thecondensation of plperonal with 2-hydroxy-4-methoxy-3-prenylactophenone and 4, 6-dimethoxy-2-hydroxy 3-prenylacetophonone respectively follow...

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