2698-42-2Relevant articles and documents
Two organic-inorganic hybrid polyoxovanadates as reusable catalysts for Knoevenagel condensation
Li, Chunxia,Zhong, Dandan,Huang, Xianqiang,Shen, Guodong,Li, Qiang,Du, Jiyuan,Li, Qianli,Wang, Suna,Li, Jikun,Dou, Jianmin
, p. 5813 - 5819 (2019)
Two novel organic-inorganic hybrid polyoxovanadates, i.e., [Ni(1-mIM)4(H2O)2][Ni(H2O)5]2V10O28·5.5H2O (compound 1) and [V(O)(1-vIM)4]2
Phosphahelicenes in asymmetric organocatalysis: [3+2] cyclizations of γ-substituted allenes and electron-poor olefins
Gicquel, Maxime,Zhang, Yang,Aillard, Paul,Retailleau, Pascal,Voituriez, Arnaud,Marinetti, Angela
, p. 5470 - 5473 (2015)
The first use of phosphahelicene in enantioselective organocatalysis is reported. New chiral phosphahelicenes have been prepared and enable highly enantioselective [3+2] cyclization reactions between arylidene- or alkylidenemalononitriles and γ-substituted allenoates or cyanoallenes. These reactions afford cyclopentene derivatives in both high yields and diastereoselectivities, with enantiomeric excesses of up to 97 %.
A porphyrin-linked conjugated microporous polymer with selective carbon dioxide adsorption and heterogeneous organocatalytic performances
Liu, Xiaoming,A, Sigen,Zhang, Yuwei,Luo, Xiaolong,Xia, Hong,Li, He,Mu, Ying
, p. 6447 - 6453 (2014)
A new porphyrin-based conjugated microporous polymer with rich nitrogen sites in the skeleton has been synthesized by alkyne-alkyne homocoupling reaction. The Brunauer-Emmett-Teller specific surface area up to 662 m 2 g-1 was obtaine
Amino functionalized Zn/Cd-metal-organic frameworks for selective CO2 adsorption and Knoevenagel condensation reactions
Zhai, Zhi-Wei,Yang, Shuang-Hua,Lv, Ya-Ru,Du, Chen-Xia,Li, Lin-Ke,Zang, Shuang-Quan
, p. 4007 - 4014 (2019)
Two amino functionalized Metal-Organic Frameworks (MOFs), {[Zn(Py2TTz)(2-NH2-BDC)]·(DMF)}n (1) and {[Cd(Py2TTz)(2-NH2-BDC)]·(DMF)·0.5(H2O)}n (2) (where Py2TTz = 2,5-bis(4-pyridyl)thiazolo[5,4-d]thiazole, 2-NH2-BDC = 2-amino-1,4-benzenedicarboxylate, and DMF = N,N-dimethylformamide), were synthesized and characterized using the primary ligand 2-amino-1,4-benzenedicarboxylic acid (2-NH2-H2BDC) and the auxiliary ligand 2,5-bis(4-pyridyl)thiazolo[5,4-d]thiazole (Py2TTz). They possess similar 2-fold interpenetrated three-dimensional bipillared-layer framework structures composed of typical binuclear metal nodes, 2-NH2-BDC two-dimensional layers and Py2TTz bipillars. Notably, thiazole nitrogen atoms and pendant -NH2 groups are present in channels in the two frameworks. Given their good chemical stabilities, high thermal stabilities, and exposed nitrogen sites, gas adsorption and catalytic experiments of the two MOFs were performed. The results demonstrate that MOF 2 can selectively adsorb carbon dioxide gas; moreover, the two MOFs can be employed as recyclable heterogeneous catalysts for Knoevenagel condensation reactions under solvent-free conditions.
Acid and base coexisted heterogeneous catalysts supported on hypercrosslinked polymers for one-pot cascade reactions
Wang, Kewei,Jia, Zhifang,Yang, Xuekang,Wang, Ling,Gu, Yanlong,Tan, Bien
, p. 168 - 176 (2017)
Heterogeneous microporous acid (sulfonic acid) and base (benzylamine) catalysts with high surface areas were synthesized using simple aromatic compounds through one-step external cross-linking reaction. The direct induction and control of catalytic sites were achieved by functionalized monomers using an appropriate amount of acid/base monomers. This strategy provides an easy approach to produce highly stable and acid/base functionalized microporous organic polymers. The structure and composition of the catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen sorption, Fourier transform infrared spectroscopy (FT-IR), solid-state 13C cross polarization magic angle spinning (CP/MAS) NMR, thermogravimetric analysis (TGA), and element mapping analysis. The stable porous skeleton and the accurate manipulation of the catalyst structure allowed us to use the obtained polymers as compatible and efficient acid/base co-catalysts for one-pot cascade reactions. We demonstrated the use of these microporous heterogeneous catalysts for the cascade deacetalization/Henry and deacetalization/Knoevenagel reactions. The results demonstrated that preparing microporous materials from simple aromatic compounds through one-step external cross-linking reaction is indeed a cost-effective and easy-to-handle method to produce functionalized heterogeneous catalysts. The microporous heterogeneous catalysts produced by this method are highly stable and the amount of catalytically active sites can easily be controlled to form a catalytic system with two antagonistic centers.
Imidazole-induced self-assembly of polyoxovanadate cluster organic framework for efficient Knoevenagel condensation under mild conditions
Dou, Ming-Yu,Huang, Xian-Qiang,Yang, Guo-Yu,Zhong, Dan-Dan
, p. 4147 - 4153 (2020/07/04)
Polyoxometalate (POM) cluster organic frameworks (POMCOFs) are an emerging class of catalytic materials, providing an opportunity to develop fascinating catalysts with well-defined, tunable, active sites for a range of chemical transformations. Although r
Tandem synthesis method of 2-(phenylmethylene)malononitrile or derivative thereof
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Paragraph 0049-0053, (2019/10/01)
A tandem synthesis method of 2-(phenylmethylene)malononitrile or a derivative thereof is disclosed. The general structural formula of the 2-(phenylmethylene)malononitrile or a derivative thereof is shown in the description, wherein R1 is hydrogen, p-methoxy, 2-bromo, 3-bromo or 4-bromo, and R2 is a cyano or ester group. A chloromethylated polystyrene microsphere acid-base functionalized catalyst is synthesized, a tandem reaction is successfully applied to the flow chemistry, and the 2-(phenylmethylene)malononitrile or a derivative thereof is synthesized in a gram scale. Compared with traditional test tube reactions, the method greatly reduces the reaction time, improves the yield and product purity, and avoids a step of separating a product from the catalyst.
