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Visible-light-induced photoredox-catalyzed synthesis of benzimidazo[2,1-a]iso-quinoline-6(5H)-ones

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Chinese Chemical Letters 2021年第3期32卷 1229-1232页

作者： Bin Wang Long Zou Lei Wang Manman Sun pinhua li Advanced Research Institute and Department of Chemistry Taizhou UniversityTaizhou 318000China Department of Chemistry Huaibei Normal UniversityHuaibei 235000China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryShanghai 200032China

A simple and efficient visible-light-induced photo redox-catalyzed diarylation of N-methacryloyl-2-arylbenzoimidazoles with aryl diazonium salts was *** reaction provides a conve nient access to a variety of benzimida... 详细信息

关键词： Benzimidazo[2,l-a]iso-quinoline-6(5H)-ones N-Methacryloyl-2-arylbenzoimidazoles Aryl diazonium salts Photoredox catalysis Visible-light-induced organic reaction

Visible-light-induced chemoselective reactions of quinoxalin-2(1H)-ones with alkylboronic acids under air/N_(2) atmosphere

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Chinese Chemical Letters 2021年第12期32卷 4033-4037页

作者： lingling Yao Defeng Zhu Lei Wang Jie liu Yicheng Zhang pinhua li Key Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationDepartment of ChemistryHuaibei Normal UniversityHuaibei 235000China Advanced Research Institute and Department of Chemistry Taizhou UniversityTaizhou 318000China Anhui Laboratory of Clean Catalytic Engineering Anhui Laboratory of Functional Complexes for Materials Chemistry and ApplicationCollege of Chemical and Environmental EngineeringAnhui Polytechnic UniversityWuhu 241000China

A visible-light-induced chemoselective reactions of quinoxalin-2(1 H)-ones with alkylboronic acids in the presence of air(O_(2)) and N_(2)atmosphere was developed under transition-metal free conditions, providing 3-alkylquinoxalin-2(1H)-ones and 3,4-dihydroquinoxalin-2(1H)-ones, respectively. The overall strategy accommodates a broad scope of substituted quinoxalin-2(1H)-ones and alkylboronic acids with good to excellent product yields.

关键词： Quinoxalin-2(1H)-ones Alkylboronic acids Visible-light-induced transformation Transition-metal-free conditions

Visible-light-induced novel cyclization of 2-(2-(arylethynyl)benzylidene)-malononitrile derivatives with 2,6-di(tert-butyl)-4-methylphenol to bridged spirocyclic compounds

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Chinese Chemical Letters 2022年第12期33卷 5069-5073页

作者： Xiaofei Xie Lei Wang Quan Zhou Yongmin Ma Zhi-Ming Wang pinhua li Advanced Research Institute and Department of Chemistry Taizhou UniversityTaizhou 318000China Department of Chemistry Anhui Polytechnic UniversityWuhu 241000China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryShanghai 200032China

A green and highly efficient strategy for the preparation of bridged spirocyclic compounds via visible-light-induced cyclization of 2-(2-(arylethynyl)benzylidene)malononitrile derivatives with 2,6-di(tert-butyl)-4-methylphenol(BHT)at room temperature was *** photoinduced radical reactions generated the corresponding products in good yields under simple and mild reaction conditions.

关键词： 2-(2-(Arylethynyl)benzylidene)malononitriles 2,6-Di(tert-butyl)-4-methylphenol Bridged spirocyclic compounds Visible-light-induced organosynthesis

Immobilized nickel(Ⅱ) on organic-inorganic hybrid materials: The effective and reusable catalysts for Biginelli reaction

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Science China Chemistry 2011年第1期54卷 74-80页

作者： ZHANG liYuan WANG ChuanHu ZHOU li li pinhua ZHANG Xiuli WANG Lei Department of Chemistry Huaibei Normal University Huaibei 235000 China Experimental Chemistry Center Bengbu College Bengbu 233030 China College of Science Anhui Agricultral University Hefei 230036 China State Key Laboratory of Organometallic Chemistry " Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

The immobilized nickel(II) on the organic-inorganic hybrid material was prepared and used as an effective catalyst for the Biginelli *** the presence of the immobilized nickel catalyst,aromatic aldehydes reacted with ethyl acetoacetate and urea (or thiourea) smoothly to generate the corresponding Biginelli products in good to excellent yields without using any *** work-up procedure is very simple and ***,the silica-supported nickel(II) could be recovered and recycled for six consecutive trials without significant loss of its catalytic activity.

关键词： Biginelli reaction immobilization of nickel(II) organic–inorganic hybrid material heterogeneous catalyst

Photochemical and electrochemical strategies in C-F bond activation and functionalization

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Organic Chemistry Frontiers 2022年第3期9卷 853-873页

作者： Zhanghong Wang Yu Sun liu-Yu Shen Wen-Chao Yang Fei Meng pinhua li College of Eco-Environmental Engineering Guizhou Minzu UniversityGuiyang 550025PR China School of Horticulture and Plant Protection Yangzhou UniversityYangzhou 225009P.R.China Anhui Laboratory of Clean Catalytic Engineering Anhui Laboratory of Functional Complexes for Materials Chemistry and ApplicationCollege of Chemical and Environmental EngineeringAnhui Polytechnic UniversityWuhuAnhui 241000P.R.of China

The activation and functionalization of C-F bonds under mild conditions can serve as an important tool for organic syntheses including the modification of pharmaceuticals and agrochemicals and the synthesis of value-a... 详细信息

关键词： bonds activation functionalization

全啮合同向旋转双螺杆挤出机螺槽中压力分布的研究

维普期刊数据库评论

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上海交通大学学报 1996年第5期30卷 115-120页

作者：李品华上海交通大学机械工程系上海

应用Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程建立了高分子聚合物在双螺杆挤出机螺槽中压力分布的计算模型．分析了喂料量、螺杆冷却方式、螺杆转速等操作工艺参数与螺槽中压力分布的关系，以及压力分布对挤出物质量（即挤出物的物理性质和力学... 详细信息

应用Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程建立了高分子聚合物在双螺杆挤出机螺槽中压力分布的计算模型．分析了喂料量、螺杆冷却方式、螺杆转速等操作工艺参数与螺槽中压力分布的关系，以及压力分布对挤出物质量（即挤出物的物理性质和力学性能）的影响．通过改善螺槽中的压力分布，寻找最佳操作工艺参数，并在此操作条件下进行了实验论证．

关键词：双螺杆挤出机压力分布挤出物质量

Preparation and Application of Magnetic Nanoparticles Supported Catalysts

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Preparation and Application of Magnetic Nanoparticles Suppor...

Direct Synthesis of Benzo[f]indazoles from Sulfonyl Hydrazines and 1,3-Enynes by Copper-Catalyzed Annulation

第十七届全国金属有机化学学术讨论会

作者： pinhua li Lei Zhang Min Wang Lei Wang Department of Chemistry Huaibei Normal University

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Direct Synthesis of Benzo[f]indazoles from Sulfonyl Hydrazin...

A CNN-SVR model for NO_(2)profile prediction based on MAX-DOAS observations:The influence of Chinese New Year overlapping the 2020 COVID-19 lockdown on vertical distributions of tropospheric NO_(2)in Nanjing,China

中国化学会·第十六届全国有机合成化学学术研讨会

作者： Biao Yao 苗涛 pinhua li Lei Wang Department of Chemistry Huaibei Normal University 淮北师范大学

Indazole moiety is a privileged N-heterocyclic structure in medicinal chemistry due to its pronounced biological and therapeutic activities,and especially,tricyclic 1 H-benzo-indazole plays increasingly important role in drug discovery. In the past few decades,a number of impressive methods have been reported for the construction of indazole frameworks, yet synthetic protocols to benzo[f]indazole are severely scarce,which have hampered their biomedical *** our work,a novel and efficient strategy for the direct synthesis of benzo[f]indazoles via copper-catalyzed cascade reaction of sulfonyl hydrazides with 1,3-enynes under mild conditions has been *** method achieves the formation of two C-N bonds and one C-C bond in one pot,providing a series of benzo[f]indazoles in good yields with good functional group tolerance and remarkable regioselectivity.

关键词： cascade cyclization 1,4-arylmigration 1,3-enyne benzo[f]indazole sulfonyl hydrazine

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Journal of Environmental Sciences 2024年第7期141卷 151-165页

作者： Xin Tian Zijie Wang pinhua Xie Jin Xu Ang li Yifeng Pan Feng Hu Zhaokun Hu Mingsheng Chen Jiangyi Zheng Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Key laboratory of Environmental Optical and Technology Anhui Institute of optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China School of Environmental Science and Optoelectronic Technology University of Science and Technology of ChinaHefei 230026China

In this study,a hybrid model,the convolutional neural network-support vector regression model,was adopted to achieve prediction of the NO_(2)profile in Nanjing from January 2019to March *** the sudden decline in NO_(2)in February 2020,the contribution of the Coronavirus Disease-19(COVID-19)lockdown,Chinese New Year(CNY),and meteorologi cal conditions to the reduction of NO_(2)was ***_(2)vertical column densities(VCDs) from January to March 2020 decreased by 59.05%and 32.81%,relative to the same period in 2019 and 2021,*** the period of 2020 COVID-19,the average NO_(2)VCDs were 50.50%and 29.96%lower than those during the pre-lockdown and post-lockdown pe riods,*** NO_(2)volume mixing ratios(VMRs)during the 2020 COVID-19 lock down significantly decreased below 400 *** NO_(2)VMRs under the different wind fields were significantly lower during the lockdown period than during the pre-lockdown period This phenomenon could be attributed to the 2020 COVID-19 *** NO_(2)VMRs be fore and after the CNY were significantly lower in 2020 than in 2019 and 2021 in the same period,which further proves that the decrease in NO_(2)in February 2020 was attributed to the COVID-19 *** source analysis of an NO_(2)pollution episode during the lockdown period showed that the polluted air mass in the Beijing-Tianjin-Hebei was trans ported southwards under the action of the north wind,and the subsequent unfavorable meteorological conditions(local wind speed of<2.0 m/sec)resulted in the accumulation o pollutants.

关键词： MAX-DOAS CNN-SVR Nitrogen dioxide COVID-19 Chinese New Year Regional transport