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A NEW METHOD FOR AROMATIZAT ION OF Δ^(5(10))-STEROIDAL C_(3)-DIMETHYL KETALS

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Chinese Chemical Letters 1993年第2期4卷 107-108页

作者： guang dian han Hong Yan WEN Institute of Materia Medica Chinese Academy of Medical Sciences Beijing100050

A new method for aromatization of Δ^(5(10))-steroidal C_3-dimethyl ketals with pyridinium hydrobromide perbromide (***·HBr·Br_2) to aromatic A ring steroids in high yield (90-95%) is described.

关键词： ION STEROIDAL C3-DIMETHYL KETALS A NEW METHOD FOR AROMATIZAT ION OF PHP

A NEW METHOD FOR THE SYNTHESIS OF ARYLTHIOCYANATES

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Chinese Chemical Letters 1991年第11期2卷 843-844页

作者： guang dian han Hong Yan WEN Institute of Materia Medica Chinese Academy of Medical SciencesBeijing 100050

Arylthiocyanates could be synthesized by reaction of arylsulfonyl chlorides with cuprous cyanide with yields ranging from 42-80％.

关键词： A NEW METHOD FOR THE SYNTHESIS OF ARYLTHIOCYANATES

Aqueous Diels-Alder Reactions of Cyclopentadicnc with Symmetric Diester of Fumarate or Maleate

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Chinese Chemical Letters 2000年第2期11卷 99-100页

作者： guang dian han1 Zhao Yang MA2 Guo Sen HE2 (1 Institute of Materia Medica, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100050 2Institute of Occupational Health, Chinese Academy of preventive Medicine, Beijing 100050) Institute of Materia Medica Peking Union Medical College Chinese Academy of Medical Sciences Beijing 100050 China Institute of Occupational Health Chinese Acad. of Preventive Medicine Beijing 100050 China

Symmetric, diesters of cis- or trans- bicyclo[2,2,1]hept-5-ene-2,3-dicarboxylate were prepared by aqueous Diels-Alder reaction of cyclopentadiene with symmetric diester of fumarate or maleate.

关键词： Aqueous Diels-Alder reaction diester of bicyclohept-5-ene-2,3-dicarboxylate diester of fumarate and maleate cyclopentadiene.

NEW METHODS FOR AROMATIZATION OF STEROIDAL 2,5(10)-DIENES

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Chinese Chemical Letters 1992年第5期3卷 339-340页

作者： guang dian han Hong Yan WENInstitute of Materia Medica,Chinese Academy of Medical Sciences,Beijing,100050

New methods for dehydrogenation of steroidal 2,5(10)-dienes with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) or pyridinium hydrobromide perbromide(PHP,Py·HBr·Br_2) to aromatic A ring steroid in quantitative yiel... 详细信息

关键词： DDQ NEW METHODS FOR AROMATIZATION OF STEROIDAL 2,5 DIENES

A Convenient Method for the Stereoselective Synthesis of 7αHydroxycholesterol

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Chinese Chemical Letters 1998年第8期9卷 715-716页

作者： Ling Jie GAO and Tian Zeng ZHAO guang dian han(The Institute of Chemistry, Henan Academy of Sciences, Zhengzhou, 450002)(Institute of Materia Medica, Peking Union Medical College,Chinese Academy of Medical Sciences, Beijing 100050) Henan Acad Sci Inst Chem Zhengzhou 450002 Peoples R China Chinese Acad Med Sci Inst Mat Med Oeking Union Med Coll Beijing 100050 Peoples R China

7α-Hydroxycholesterol was prepared from cholesteryl acetate via allylic browhnation followed by hydroxylation in 73% overall yield.

关键词： 7α-hyrdoxycholesterol cholesteryl acetate stereoselective hydroxylation

SYNTHESIS　OF　POLYSUBSTITUTED　AROMATIC　COMPOUNDS：***　DIELS－ALDER　REACTION　OF　1－CHLORO　SUBSTITUTED　DIENES　WITH　DIMETHYL　ACETYLENEDICARBOXYLATE

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Chinese Chemical Letters 1994年第2期5卷 99-100页

作者： $guang dian han Guo Feng HUANG(Institute of Materia Mechca,Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050)

The polysubstituted aromatic compounds were prepared via the Diels-Alder reaction of 1-chloro substituted dienes with dimethyl acetylenedicarboxylate.

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SYNTHESIS OF POLYSUBSTITUTED AROMATIC COMPOUNDS:Ⅰ.THE DIELS-ALDER REACTION OF SELENO SUBSTITUTED 3-SULFOLENES WITH DIMETHYL ACETYLENEDICARBOXYLATE

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Chinese Chemical Letters 1993年第10期4卷 871-872页

作者： guang dian han Guo Feng HUANG Institute of Materia Medica,Chinese Academy of Medical Sciences and Peking Union Medical College.Beijing 100050

The seleno substituted aromatic compounds were prepared via the Diels-Alder reaction of seleno substituted 3-sulfolenes with dimethyl acetylenedicarboxylate followed by DDQ dehydrogenation.

关键词： TMS HNMR SYNTHESIS OF POLYSUBSTITUTED AROMATIC COMPOUNDS THE DIELS-ALDER REACTION OF SELENO SUBSTITUTED 3-SULFOLENES WITH DIMETHYL ACETYLENEDICARBOXYLATE OCH ppm

DGK5-mediated phosphatidic acid homeostasis interplays with reactive oxygen species in plant immune signaling

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Journal of Integrative Plant Biology 2024年第7期66卷 1263-1265页

作者： dian Wang Minhang Yuan Yamei Zhuang Xiu-Fang Xin guang Qi Crop Research Institute Shandong Academy of Agricultural Sciences/National Engineering Research Center of Wheat and Maize/Shandong Technology Innovation Center of WheatJinan 252100China College of Agronomy Qingdao Agricultural UniversityQingdao 266109China National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China

Plants have evolved a complex innate immune system that deploys two interconnected receptor layers to detect the invasion of various *** surface-resident pattern recognition receptors(PRRs)perceive pathogen-or microbeassociated molecular patterns(PAMPs/MAMPs),initiating a basal defense response called pattern-triggered immunity(PTI)(Zhou and Zhang,2020).

关键词： pattern homeostasis immunity

Advances in depressants for flotation separation of Cu–Fe sulfide minerals at low alkalinity:A critical review

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 1-17页

作者： Qicheng Feng Wenhang Yang Maohan Chang Shuming Wen dianwen Liu guang han State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Land Resource EngineeringKunming University of Science and TechnologyKunming 650093China Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources Kunming University of Science and TechnologyKunming 650093China

The flotation separation of Cu–Fe sulfide minerals at low alkalinity can be achieved using selective *** the flotation system of Cu–Fe sulfide minerals,depressants usually preferentially interact with the pyrite surface to render the mineral surface hydrophilic and hinder the adsorption of the *** review summarizes the advances in depressants for the flotation separation of Cu–Fe sulfide minerals at low *** advances include use of inorganic depressants (oxidants and sulfur–oxygen compounds),natural polysaccharides (starch,dextrin,konjac glucomannan,and galactomannan),modified polymers (carboxymethyl cellulose,polyacrylamide,lignosulfonate,and tricarboxylate sodium starch),organic acids (polyglutamic acid,sodium humate,tannic acid,pyrogallic acid,salicylic acid,and lactic acid),sodium dimethyl dithiocarbamate,and *** potential application of specific inorganic and organic depressants in the flotation separation of Cu–Fe sulfide minerals at low alkalinity is *** advances in the use of organic depressants with respect to the flotation separation of Cu–Fe sulfide minerals are comprehensively ***,the depression performances and mechanisms of different types of organic depressants on mineral surfaces are ***,several perspectives on depressants vis-à-vis flotation separation of Cu–Fe sulfide minerals at low alkalinity are proposed.

关键词： Cu–Fe sulfide minerals flotation separation selective depressants depression mechanism