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Healing Behavior of Micropores in Powder Metallurgy 316L Stainless Steel during Hot Forging and Heat Treatment

Journal of Iron and Steel Research International 2014年第9期21卷 862-868页

作者： Ying KAN Shi-hong ZHANG Li-wen ZHANG Ming CHENG Hong-wu SONG Hong-wei LU School of Materials Science and Engineering Dalian University of Technology Institute of Metal Research Chinese Academy of Sciences forge plant Angang Heavy Machine Co.Ltd.

The healing behavior of micropores in powder metallurgy （P/M） 316L stainless steel during hot forging and subsequent heat treatment was studied. The results showed that hot forging can improve the homogeneity of the pore size and enhance the relative density of material in varying degree due to different forging temperatures. As a re- sult of deformation and diffusion bonding at high temperature, the irregular pores were spheroidized and finally turned into stable inner grain pores. The comparison of compression behavior between P/M and wrought dense mate rials has shown that the pores can either be the obstacles of dislocation movement or be the nucleation sites accelera- ting the reerystallization according to the difference of deformation temperatures.

关键词： powder metallurgy 316L stainless steel microstructural evolution densification behavior micropore

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Synthetic studies towards(-)-deserpidine:Total synthesis of the stereoisomer and derivative of (-)-deserpidine

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Chinese Chemical Letters 2021年第1期32卷 401-404页

作者： Pingzhou Wu Qilong Zhou Xiao-Yu Liu Fei Xue Yong Qin Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyWest China School of PharmacySichuan UniversityChengdu 610041China School of Pharmaceutical Sciences and the Innovative Drug Research Centre Chongqing UniversityChongqing 401331China

The asymmetric synthesis of 16,17,20-epi-deserpidine and a derivative of(-)-deserpidine has been *** feature s in the assembly of the pentacyclic framework include a visible-light photocatalytic intra-/inter-/intramolecular radical cascade reaction to construct the tetracyclic ABCD ring system in one-pot and an intramolecularaldol reaction to forge the cyclohexane E ring.

关键词： Yohimbine alkaloids Deserpidine Photoredox catalytic radical cascade reaction Total synthesis

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Construction of the pentacyclic intermediate of the arcutine alkaloids

Construction of the pentacyclic intermediate of the arcutine...

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中国化学会第十二届全国天然有机化学学术会议

作者： Wei Nie Jing Gong Jiazhen Liu Xiao-Yu Liu Yong Qin Key Laboratory of Drug Targeting and Drug Delivery Systems of the Ministry of Education Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial TechnologyWest China School of PharmacySichuan University

In 2000 and 2001,Saidhhodzhaeva and Bassonova reported the isolation and characterization of two unique diterpenoid alkaloids(arcutine and arcutinine) from Aconitum arcuatum Maxim,their structures were confirmed by X-ray crystallography analysis .The arcutines differ from known alkaloids for their unusual C5-C20 bridge other than C10-C20 *** date,total syntheses of these natural products still unsurmountable .Here,we demonstrate our synthetic approach towards arcutine *** two adjacent all-carbon quaternary centers could be constructed by palladium-catalyzed decarboxylative alkylation of allyl enol carbonate *** several manipulations,the OD/DA(oxidative dearomatization/Diels-Alder cycloaddition) strategy was used to forge the bicyclo[2.2.2]octane ring(3→4).With tetracyclic triketone 4 in hand,the pivotal pentacyclic intermediate 5 could be obtained using the ketyl-olefin cyclization.

关键词： arcutine total synthesis oxidative dearomatization/Diels-Alder cycloaddition ketyl-olefin cyclization

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