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Enantioselective Conjugate Addition-Protonation of 5H-Oxazol-4-ones and 5-Methylene 1,3-Oxazolidine-2,4-diones: 2,2'-Biphenol-lnduced Diastereoselectivity Switch

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Chinese Journal of Chemistry 2019年第7期37卷 689-694页

作者： Bohua Lu Shuang Xin BO zhu junbiao Chang Henan Key Laboratory of Organic Functional Molecule and Drug Innovation School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang Henan 453007 China

A synthetic strategy for catalytic asymmetric conjugate addition-protonation and diastereoselective switch between 5H-oxazol-4-ones and 5-methylene 1,3-oxazolidine-2,4-diones was *** array of chiral conjugate addition-protonation products bearing 1,3-O-heterotertiary-O-heteroquarternary nonadjacent stereocenters were obtained in excellent yields,moderate to good diastereoselectivities,and excellent enantioselectivities (up to 97% yield,11:1 dr,and 98% ee).Induction by 2,2'-biphenol could effectively promote the production of the corresponding diastereoisomers via cycloaddition intermedia.

关键词： Conjugate Addition Diastereoselectivity

Molecular engineering of an electron-transport triarylphosphine oxide-triazine conjugate toward high-performance phosphorescent organic light-emitting diodes with remarkable stability

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Science China Chemistry 2020年第7期63卷 904-910页

作者： Ling-Ling Chen Ling Peng Lin-Ye Wang Xu-Hui zhu Jian-Hua Zou junbiao Peng State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and DevicesSouth China University of Technology(SCUT)Guangzhou 510640China Guangzhou New Vision Opto-Electronic Technology Co. LtdGuangzhou 510730China

Organic electron-transport materials are an essential component to boost performances and stability of organic light-emitting diodes. We present a robust organic electron-transport compound 3-(6-(3-(4,6-bis(4-biphenylyl)-1,3,5-triazin-2-yl)phenyl)pyridin-2-yl)phenyldiphenylphosphine oxide by facilely coupling the triphenylphosphine oxide moiety to the 2-phenyl-4,6-bis(4-biphenylyl)-1,3,5-triazine unit via a 2,6-pyridinylene linker. It is well soluble in weakly polar solvents and possesses a high Tg of 123 ℃ with an exceptional Td≈470 ℃ at 1% weight loss and deep HOMO/LUMO levels of ca.-6.45/-3.06 eV. The phosphorescent spectrum measured in solid state at 77 K reveals a notable triplet energy of 2.88 eV. n-Doping with 8-hydroxyquinolatolithium(Liq) produces the electron mobility value of 4.66×10-5–3.21×10-4 cm2 V-1 s-1@(2–5)×105 V ***, the contrasting solubility of the bromo reaction intermediate and the new compound in alcoholic solvents facilitates separation. The characterizations of bottom-and top-emission green phosphorescent OLEDs involving this single Liq-doped electron-transport layer reveal long stability. In particular, the latter provides outstanding performances with 77.4 cd A–1(corresponding to an EQE of 18.7%) and 86.8 lm W–1@ca. 1000 cd m-2, based on the green emitter bis(2-phenylpyridine)(2-(4-methyl-3-phenylphenyl)pyridine)iridium(Ⅲ). Moreover, driven by a constant current for ca. 640 h, the initial luminance of 1000 cd m–2 appears almost no decay.

关键词： electron-transport materials halogen impurities heterocycles lifetime phosphine oxides

Aromatic inorganic acid radical

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Science China Chemistry 2019年第12期62卷 1656-1665页

作者： Jiawen Zhou Weiya zhu Miao Zeng Qingqing Yang Ping Li Linfeng Lan junbiao Peng Yuan Li Fei Huang Yong Cao State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts&TelecommunicationsNanjing 210023China

Stable radicals are challenging to prepare due to their intrinsic high ***,three trisphenolamine radicals were readily synthesized and exhibited unexpected thermal/electrochemical stability and semiconductor *** three nitroxide radicals could be considered as a class of aromatized nitro groups or HNO3 *** closed-shell nitro-like and open-shell nitroxide resonance structure contribute to their outstanding ***,the tunable ground states,extremely low band gap and p-type charge transport properties were systematically *** importantly,the work presents the concept of aromatic inorganic acid radical(AIAR)and aggregation-induced radical(AIR)mechanism to understand the intrinsic structureproperty relationship of these *** addition,we provide a novel strategy for the design of stable and low bandgap radicals for organic electronics,magnetics,spintronics,etc.

关键词： organic electronics aromatic nitric acid radical aggregation-induced radical polycyclic aromatic hydrocarbons spintronics

Appending triphenyltriazine to 1,10-phenanthroline: a robust electron-transport material for stable organic light-emitting diodes

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Science Bulletin 2018年第7期63卷 446-451页

作者： Guang Jin Jun-Zhe Liu Jian-Hua Zou Xiao-Lan Huang Meng-Jiao He Ling Peng Ling-Ling Chen Xu-Hui zhu junbiao Peng Yong Cao State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology (SCUT)

There has been an increasing demand for high-performance and cost-effective organic electron-transport materials for organic light-emitting diodes （OLEDs）. In this contribution, we present a simple compound 3-（3-（4,6-diphenyl-l,3,5-triazin-2-yl）phenyl）-1,10-phenanthroline through the facile Pd-catalyzed coupling of a triphenyltriazine boronic ester with 3-hromo-1,10-phenanthroline. It shows a high Tg of 112℃. The ultraviolet photoelectron spectroscopy measurements reveal a deep HOMO level of -6.5 eV. The LUMO level is derived as -3.0 eV, based on the optical bandgap. The low-temperature solid-state phosphorescent spectrum gives a triplet energy of -2.36eV. n-Doping with 8-hydroxyquinolatolithium （Liq, 1：1） leads to considerably improved electron mobility of 5.2 × 10 -6 -5.8 × 10 -5 cm2 v-1 S-1 at E=（2-5） × 10 5Vcm -1, in contrast with the triarylphosphine oxide- phenantroline molecular conjugate we reported previously. It has been shown that through optimizing the device structure and hence suppressing polaron-exciton annihilation, introducing this single Liq-doped electron-transport layer could offer high-efficiency and stable phosphorescent OLEDs.

关键词： Electron transport materials Organic light-emitting diodes Phenanthroline Device stability Triazine

Efficient de novo assembly and modification of large DNA fragments

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Science China(Life Sciences) 2022年第7期65卷 1445-1455页

作者： Shuangying Jiang Yuanwei Tang Liang Xiang Xinlu zhu Zelin Cai Ling Li Yingxi Chen Peishuang Chen Yuge Feng Xin Lin Guoqiang Li Jafar Sharif junbiao Dai CAS Key Laboratory of Quantitative Engineering Biology Guangdong Provincial Key Laboratory of Synthetic Genomics and Shenzhen Key Laboratory of Synthetic GenomicsShenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China RIKEN Center for Integrative Medical Sciences(IMS) Developmental Genetics LaboratoryYokohama 230-0045Japan

Synthetic genomics has provided new bottom-up platforms for the functional study of viral and microbial *** construction of the large,gigabase(Gb)-sized genomes of higher organisms will deepen our understanding of genetic blueprints *** for the synthesis and assembly of such large-scale genomes,the development of new or expanded methods is *** this study,we develop an efficient pipeline for the construction of large DNA fragments sized 100 kilobases(kb)or above from scratches and describe an efficient method for“scar-free”engineering of the assembled *** method,therefore,should provide a standard framework for producing long DNA molecules,which are critical materials for synthetic genomics and metabolic engineering.

关键词： DNA assembly budding yeast large DNA fragments sequence modification DNA synthesis Synthetic Biology

A concise synthesis of organic small-molecular cathode interfacial materials for organic electronics

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A concise synthesis of organic small-molecular cathode inter...

环境规制如何影响规模养猪户的生猪粪便资源化利用决策——基于规模养猪户感知视角

中国化学会第29届学术年会

作者： Wan-Yi Tan Jian-Hua Zou Xu-Hui zhu junbiao Peng Yong Cao State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology （SCUT）

Recent years have witnessed tremendous progress of organic electronics towards practical *** others,the quest for stable cathodes that perform effective electron injection or collection has led to an increasingly large number of cathode interfacial materials,ranging from inorganics to organic small molecules and *** report hereby our recent effort on pursuing organic small-molecular cathode interfacial materials with an emphasis particularly on concise synthesis and *** resultant function in organic electronic devices such as organic photovoltaics and light-emitting diodes is *** some cases,preliminary data on device stability are provided.

关键词： cathode interfacial materials small molecules organic photovoltaics organic light-emitting diodes

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中国农村观察 2021年第6期 85-107页

作者：朱润何可张俊飚华中农业大学经济管理学院湖北农村发展研究中心华中农业大学农业绿色低碳发展实验室

本文以规模养猪户为研究对象,尝试从规模养猪户感知视角测度引导型环境规制、约束型环境规制和激励型环境规制,并通过理论分析与实证研究相结合的方法探讨3类环境规制对规模养猪户生猪粪便资源化利用决策的影响。研究结果表明:随着时间... 详细信息

本文以规模养猪户为研究对象,尝试从规模养猪户感知视角测度引导型环境规制、约束型环境规制和激励型环境规制,并通过理论分析与实证研究相结合的方法探讨3类环境规制对规模养猪户生猪粪便资源化利用决策的影响。研究结果表明:随着时间的推移,更多的规模养猪户开始选择对生猪粪便进行资源化利用,但仍存在较大的提升空间;引导型环境规制、约束型环境规制和激励型环境规制对规模养猪户的生猪粪便资源化利用决策均有显著的促进作用,其中,引导型环境规制发挥的作用最大。进一步研究发现,引导型环境规制除了能直接影响规模养猪户的生猪粪便资源化利用决策外,还可以通过环境认知、价值感知、技术认知和社会信任产生间接影响;引导型环境规制在约束型环境规制、激励型环境规制影响规模养猪户的生猪粪便资源化利用决策过程中发挥调节效应。

关键词：环境规制生猪粪便规模养猪户资源化利用中介效应调节效应

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吡唑酮化合物在催化不对称反应中的应用

化学进展 2020年第11期32卷 1710-1728页

作者：李路瑶徐鑫尧朱博常俊标河南师范大学化学化工学院

吡唑-5-酮类化合物在具有生物活性化合物中占有重要地位,该类化合物得到化学家们的广泛关注。吡唑-5-酮及其常见衍生物具有多个反应位点,可参与多种类型的不对称反应(如不对称加成反应、不对称环化反应和其他不对称反应类型)。本文主要... 详细信息

吡唑-5-酮类化合物在具有生物活性化合物中占有重要地位,该类化合物得到化学家们的广泛关注。吡唑-5-酮及其常见衍生物具有多个反应位点,可参与多种类型的不对称反应(如不对称加成反应、不对称环化反应和其他不对称反应类型)。本文主要从吡唑-5-酮类化合物参与的不对称催化反应类型进行分类,阐述了各类底物参与的反应类型及其主要反应位点,对近年来吡唑酮及其常见衍生物参与的不对称反应研究进展进行总结,并对其未来发展方向进行展望。

关键词：吡唑酮化合物不对称催化加成反应环化反应

Experimental study of therapy of bone marrow mesenchymal stem cells or muscle-like cells/calcium alginate composite gel for the treatment of stress urinary incontinence

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Experimental study of therapy of bone marrow mesenchymal ste...