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atom-economic synthesis of an oligomeric P/N-containing fire retardant towards fire-retarding and mechanically robust polylactide biocomposites

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Journal of Materials Science & Technology 2023年第29期160卷 86-95页

作者： Jiabing Feng Yixia Lu Hongyan Xie Yan Zhang Siqi Huo Xiaohuan Liu Matt Flynn Zhiguang Xu Paulomi Burey Mark Lynch Hao Wang Pingan Song China-Australia Institute for Advanced Materials and Manufacturing Jiaxing UniversityJiaxing 314001China China National Textile and Apparel Council Key Laboratory of Flame Retardancy Finishing of Textile Materials Soochow UniversitySuzhou 215123China Laboratory of Polymer Materials and Engineering NingboTech UniversityNingbo 315100China Centre for Future Materials University of Southern QueenslandSpringfieldQLD 4300Australia College of Life Science Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhou 318000China School of Agriculture and Environmental Science University of Southern QueenslandSpringfieldQLD 4300Australia

Renewable and biodegradable polylactide (PLA) has excellent mechanical strength but is highly flammable which restricts its practical applications. Many phosphorus/nitrogen (P/N)-based flame retardants are ef- fective in PLA, but their high addition loading usually decreases the mechanical strength of the PLA bulk. For polyphosphoramides, despite high fire-retardant efficiency, their chemical synthesis often generates chemical wastes as byproducts. Herein, we report an atom-economic and highly efficient oligomeric P/N fire retardant (APN) prepared using a mild Michael addition polymerization with no byproducts. Using only 3 wt% APN, the resulting PLA exhibits desired fire retardancy including a UL-94 V-0 rating and a limiting oxygen index of 37.6%. Furthermore, the toughness of the fire-retardant PLA increases by 85% compared to pure PLA, with both tensile strength and thermal stability preserved. This work offers an atom-economic strategy for synthesizing highly efficient P/N fire retardants for use in the creation of fire-resistant PLA with robust mechanical properties.

关键词： atom economy Fire retardant Polylactide Mechanical properties

Catalytic Cracking of Polylactic Acid to Acrylic Acid

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Chinese Journal of Chemistry 2023年第17期41卷 2071-2076页

作者： Yuchen Jiao Meng Wang Ding Ma Beijing National Laboratory for Molecular Sciences New Cornerstone Science LaboratoryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Comprehensive Summary,As a typical type of sustainable plastic,polyesters can be recycled or upcycled into value-added chemicals in a variety of ***,excess reagents are required for most of the depolymerization and upcycling processes,causing the emission of environmental pollutants and the waste of chemical *** we demonstrate a one-pot catalytic process to directly crack polylactic acid into acrylic acid by acid catalyst with the assistance of an ionic liquid,*** acid is attacked by the Br–from Bu4PBr and the H+from acid to form oligomers containing Br or acryloyl group,and these oligomers serve as intermediates to produce acrylic acid during their mutual *** acrylic acid is vaporized directly from the reactor and obtained in a collector with a selectivity around 90%when polylactic acid is fully *** green process shows great advantages in atom economy compared to the conventional recycling/upcycling methods for polyesters,in addition.

关键词： Polylactic acid Acrylic acid atom economy Upcycling lonic liquid Commodity polymers Plastics Green chemistry

Electrochemical regioselective synthesis of N-substituted/unsubstituted 4-selanylisoquinolin-1(2H)-ones

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Chinese Chemical Letters 2022年第3期33卷 1501-1504页

作者： Zhi-Lin Wu Jin-Yang Chen Xian-Zhi Tian Wen-Tao Ouyang Zhuo-Tao Zhang Wei-Min He School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China

A novel and efficient electro-chemical initiated radical strategy was developed for the preparation of both N-substituted and N-unsubstituted 4-selanylisoquinolin-1(2H)-ones through selenylation of isoquinolin-1(2H)-o... 详细信息

关键词： Organodiselenide Electrochemistry Radical atom economy Additives-free

Copper-catalyzed diversified annulations betweenα-diketones and alkynylα-diketones

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Chinese Chemical Letters 2022年第6期33卷 2997-3002页

作者： Xiangwen Kong Fang Yu Shengtong Niu Fan Gong Shuang Yang Jinggong Liu Benlong Luo Xinqiang Fang State Key Laboratory of Structural Chemistry and Key Laboratory of Coal to Ethylene Glycol and Its Related TechnologyCenter for Excellence in Molecular SynthesisFujian Institute of Research on the Structure of MatterUniversity of Chinese Academy of SciencesFuzhou 350100China Pingxiang University Pingxiang 337055China Orthopedics Department Guangdong Provincial Hospital of Traditional Chinese MedicineThe Second Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhou 510120China

Copper-catalyzed divergent annulations betweenα-diketones and alkynylα-diketones have been achieved,delivering a series of highly functionalized and biologically important cis-hexahydro-2Hcyclopenta[b]furan(HCPF)and 2-hydroxydihydrofuran-3(2H)-one(HDFO)products with high levels of stereoselectivity under identical *** protocol features the use of earth-abundant copper catalyst,mild conditions,shortening synthetic routes in constructing different molecular frameworks,and reducing the corresponding possible waste *** substituents of the nucleophilicα-diketones play crucial roles in switching the reaction pathways.

关键词： Copper catalysis α-Diketones Diversified annulations Substituents-controlled reactivities atom economy

Chemoenzymatic Synthesis of Ramosetron Hydrochloride

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Chemical Research in Chinese Universities 2012年第1期28卷 70-72页

作者： LIU Qing-wen1 , XU Hao1, TIAN Hua1, ZHENG Liang-yu2 and ZHANG Suo-qin1 1. College of Chemistry, 2. Key Laboratory for Molecular Enzymology and Engineering, Ministry of Education, Jilin University, Changchun 130012, P. R. China College of Chemistry Jilin University 130012 Jilin University Key Laboratory for Molecular Enzymology and Engineering Ministry of Education 130012

A new method for the synthesis of ramosetron hydrochloride, the most wildly used 5-HT3 receptor antagonist, was reported. The intermediate 8 was obtained in a high e.e. value via lipase catalyzed hydrolytic kinetic resolution. Then enantiomerically pure ramosetron hydrochloride was synthesized in two steps with excellent yield （the total yield is 24.6%）. The method provides a new environment friendly and atom economy way to synthesize enantiomerically pure ramosetron.

关键词： Ramosetron hydrochloride Chemical enzymatic synthesis atom economy

Chemical Reaction Route Selection Based on Green Chemical Engineering

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Chinese Journal of Chemical Engineering 2004年第5期12卷 662-667页

作者：何潮洪葛挺峰 David W.Edwards Department of Chemical Engineering Zhejiang University Hangzhou 310027 China Department of Chemical Engineering Loughborough University Leicestershire LE11 3TU UK

In the preliminary stage of chemical process design, the choice of chemical reaction route is the key design decision, and the concepts of atom utilization and environmental quotient have become extremely useful tools. However, the waste quality such as chemical toxicity and other engineering factors have not been taken into account. Therefore, a synthetic route selection index, Iroute, is proposed to determine the suitability of a chemical route in this paper. Iroute considers the effects of 'extended atom economy', material renewability, chemical characteristics and some engineering factors. The extended atom economy concept regards not only the value of the desired product but also the value of byproducts. The methodology by using Iroute to compare different routes is illustrated in case study of cyclohexanone oxime and acrylonitrile manufacture.

关键词： green design reaction route selection atom economy product chain

Catalytic C2 prenylation of unprotected indoles:Late‐stage diversification of peptides and two‐step total synthesis of tryprostatin B

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Chinese Journal of Catalysis 2021年第9期42卷 1593-1607页

作者： Yan‐Cheng Hu Ying Li Ding‐Wei Ji Heng Liu Hao Zheng Gong Zhang Qing‐An Chen Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

C2 prenylated indoles are widespread in a variety of bioactive natural ***,theselective installation of prenyl group at C2 position of NH indoles is of great ***,the known protocols generally require a multi‐step procedure and stoichiometric *** develop a one‐step C2 prenylation of NH indole with cheap tert‐prenyl alcohol enabled by *** features include good regioselectivity,step‐and atom‐economy,broad substratescope,and simple catalytic *** mechanistic investigations demonstrate that both C2prenylation and C3 prenylation/migration pathways are engaged in the ***,this practicalstrategy can be applied to the late‐stage diversification of tryptophan‐based peptides and concisesynthesis of tryprostatin B.

关键词： Indole prenylation Step economy atom economy Tryptophan Peptide diversification Total synthesis

The Technology of Green Chemistry and Its Function in Redox Response and: Environmentally Friendly Technology for Sustainable Development: Assessment of Recent Findings

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Advances in Chemical Engineering and Science 2022年第3期12卷 131-144页

作者： Meselu Eskezia Ayalew Thevabakthi Siluvai Muthu Arul Jeevan Department of Chemistry Oda Bultum University Chiro Ethiopia Department of Chemistry Mizan Tepi University Mizan Tepi Ethiopia

Sustainability is the ability to nurture or support a process for a long time without compromising the needs of future generations. Rather, sustainable chemistry is a term that refers to the production of chemical products and processes that reduce or eliminate the use and production of hazardous substances. Green chemistry creates alternative technologies that are safer for human health and the environment to prevent further damage to human health and the environment, such as reducing the release of hazardous chemicals into the air, leading to reduced lung damage. Although sustainable and environmentally friendly technologies have evolved in other areas of science, their use in redox reactions and industry is still in its early stages. The current review aims to highlight the need for green chemistry as a sustainable chemistry and its principles and its application to produce environmentally friendly industrial products and to reduce or stop the production of harmful intermediates and products during its synthesis process.

关键词： atom economy Green Chemistry Green Technology Oxidation Reduction

Green Functionalization of Unsaturated Hydrocarbons

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Green Functionalization of Unsaturated Hydrocarbons