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Catalytic alkane dehydrogenations

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Science Bulletin 2015年第15期60卷 1316-1331页

作者： Yuxuan Zhang Wubing Yao Huaquan Fang Aiguo Hu Zheng Huang Shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science and Engineering East China University of Science and Technology State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences

Olefins find widespread applications in the synthesis of polyolefins and fine chemicals. With an increasing demand for olefins, the technologies for alkane dehydrogenation have drawn much attention. Several types of heterogeneous catalysts have found applications in industry for the dehydrogenation of light alkanes, mainly ethane, propane, and butane. In the past three decades, a number of transition-metal complexes,particularly pincer-ligated iridium complexes, have been developed as the homogeneous catalysts for alkane dehydrogenations. The homogeneous catalyst systems operate under much milder conditions compared with the heterogeneous systems, and some systems exhibit good activity and high regioselectivity in dehydrogenation of alkanes longer than butane.

关键词： Olefins Alkane dehydrogenation Heterogeneous catalysts Homogeneous catalysts pincer ligand Iridium complexes

Synthesis,characterization and reactivity of a neutral antimony(Ⅲ) complex

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Chinese Chemical Letters 2021年第2期32卷 717-720页

作者： Xiong Sun Congqing Zhu State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials.School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China

pincer complexes are widely used in organometallic and coordination *** role of antimony as a central donor atom in pincer ligands has been extensively explored in recent *** phenylenediamine derived PXP(X=B,Al,C,Si,Ge,Sn,N) type ligands exhibit diverse reactivity,analogues species based on antimony have been reported less ***,we report a new PSbP complex and evaluate its *** species will broaden the family of phenylenediamine derived pincer complexes.

关键词： pincer ligand Antimony Phenylenediamine Coordination

Carbon-halogen bond activation by a structurally constrained phosphorus(Ⅲ)platform

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Chinese Chemical Letters 2021年第4期32卷 1432-1436页

作者： Penglong Wang Qin Zhu Yi Wang Guixiang Zeng Jun Zhu Congqing Zhu State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China Kuang Yarning Honors School Institute for Brain SciencesNanjing UniversityNanjing 210093China State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials(iChEM) and Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Theσ-bond activation by main group element has received enormous attention from theoretical and experimental ***,the reaction of C-X(X=Cl,Br,I)bonds in benzyl and allyl halides with a pincer-type phosphorus(Ⅲ)species was reported.A series of structurally robust phosphorus(Ⅴ)compounds were formed via the formal oxidative addition reactions of C-X bonds to the phosphorus(Ⅲ)*** functional theory calculations show that the nucleophilic addition process is more favorable than the direct oxidative addition *** of bent structures of phosphorus(Ⅲ)compound to poorly nucleophilic compounds to undergo further C-X bond activation can be rationalized by frontier molecule orbital *** study not only provides a deep understanding of the reactivity of phosphorus(Ⅲ)species but also demonstrates a potential of main group elements for the small-molecule activation.

关键词： pincer ligand Phosphorus C-X bond activation Main group element

Co-Catalyzed Dehydrogenation Claisen Condensation of Secondary Alcohols with Esters

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Chinese Journal of Chemistry 2024年第22期42卷 2818-2824页

作者： Shuo Gao Wentao Hao Yuqi Ji Xiulin Li Chunyan Zhang Guoying Zhang State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuanShanxi 030o01China College of Ecology Taiyuan University of TechnologyTaiyuanShanxi 030001China Universityof ChineseAcademyof Sciences Beijing100049China

Comprehensive Summary Catalytic dehydrogenation,with its exceptional atom economy and chemoselectivity,offers a highly desirable yet challenging approach for converting multiple environmentally friendly alcohols into crucial ***,the utilization of catalysts based on abundant elements found on Earth for alcohol dehydrogenation to produce acryl ketone holds significant promise as a versatile strategy in synthesizing key building blocks for numerous pharmaceutical *** present study describes a practical Co-catalyzed cascade dehydrogenative Claisen condensation of secondary alcohols with esters,facilitating the synthesis of a wide range of *** introduce a catalytic system based on novel and scalable indazole NNP-ligands coordinated to cobalt for efficient dehydrogenations of secondary alcohols,and propose a plausible reaction mechanism supported by control experiments and labeling ***,it allows for the streamlined synthesis of multiple pharmaceuticals in one-pot.

关键词： Cobalt pincer ligand Dehydrogenation Claisen Condensation 3-Hydroxy-prop-2-en-1-one Alcohols 3d transition metals Enols Enones