7443-24-5Relevant articles and documents
Organophosphonate-Functionalized Telluromolybdate Containing a [TeMo10O37]10-Building Block and Its Catalytic Efficiency for Knoevenagel Condensation
Kong, Hui,Xu, Baijie,Zhen, Jing,Liu, Siyu,Li, Keli,Ma, Pengtao,Wang, Jingping,Niu, Jingyang
, p. 14872 - 14879 (2021/10/01)
A novel organodiphosphonate-based telluromolybdate cluster, (NH4)6Na3H13[TeMo10O37(CoMo2O6L)4]·11H2O [1; L = (O3P)2C(O)(CH2)3NH2], has been successfully synthesized by a simple one-pot aqueous reaction. Intriguingly, the [TeMo10O37]10- subunit with tetrah
Bismuth (III) Triflate: A Mild, Efficient Promoter for the Synthesis of Trisubstituted Alkenes through Knoevenagel Condensation
Datta, Arup
, p. 843 - 849 (2020/11/25)
In this work, smooth efficient and eco-friendly two component coupling method is reported for the synthesis of Knoevenagel Condensation product in presence of Bi(OTf)3 catalyst under solvent free condition. Catalyst has participated in condensation between substituted aldehydes (aromatic and hetero-aromatic) and active methylene compounds (ethyl cyanoacetate, malononitrile and cyanoacetamide) effectively to generate an excellent yield of the product. Bi(OTf)3 catalyst is stable, inexpensive and easily available was used for four times in this reaction without loss of catalytic activity. [Formula Presented]
Synthesis and Characterization of a Crown-Shaped 36-Molybdate Cluster and Application in Catalyzing Knoevenagel Condensation
He, Peipei,Kannan, Thirumurthy,Kong, Hui,Ma, Pengtao,Niu, Jingyang,Wang, Jiawei,Wang, Jingping,Xu, Baijie,Xu, Qiaofei
, (2020/07/27)
A novel crown-shaped 36-molybdate cluster with organophosphonate-functionalized polyoxomolybdates, (NH4)17Na7H12[Co(H2O)TeMo6O21{N(CH2PO3)3}]6·42H2O, has been successfully synthesized and well-characterized. It owns the highest nuclearity in the family of organophosphonate-based polyoxometalates reported so far. Furthermore, for the first time in the field, we illustrated that polyoxomolybdate could work as an effective heterogeneous catalyst for the Knoevenagel condensation reaction with high TOF (7714 h-1) and good recyclability. Impressively, the catalytic performance of 1 was also tested successfully in a large scale (～10 g) reaction, where 89percent of reaction yield and 3216 of TON were afforded.
l-Lysine Functionalized Polyacrylonitrile Fiber: A Green and Efficient Catalyst for Knoevenagel Condensation in Water
Li, Pengyu,Liu, Yuanyuan,Ma, Ning,Zhang, Wenqin
, p. 813 - 823 (2018/01/27)
Abstract: The l-lysine functionalized polyacrylonitrile fiber (PANLF) was prepared by grafting the l-lysine into a commercially available polyacrylonitrile fiber and showed highly catalytic activity for Knoevenagel condensation reaction. With low temperature (45?°C) and short reaction time (1?h), the fiber catalyst was well applicable to Knoevenagel condensation of a wide range of aldehydes and the yields could reach up to 99%. Interestingly, only in water could the reaction take place smoothly (with a yield of 88%) and a polar micro-environment promoted reaction process had been proposed to explain this phenomenon. Besides, the fiber catalyst has advantages of easy preparation, high functional degree, strong mechanical strength and thermal stability, etc. And it can be reused at least 5 times without further treatment and performed well in scaled-up experiment (amplified 50 times) and flow chemistry experiment (no loss of catalytic activity after 48?h), which indicates its potential application in industry application. Graphical Abstract: [Figure not available: see fulltext.].
Polyoxoniobates as a superior Lewis base efficiently catalyzed Knoevenagel condensation
Xu, Qiaofei,Niu, Yanjun,Wang, Guan,Li, Yingguang,Zhao, Yuan,Singh, Vikram,Niu, Jingyang,Wang, Jingping
, p. 93 - 99 (2018/05/22)
The outstanding basicity of negative charged Lindqvist type Polyoxoniobate K7HNb6O19·13H2O (Nb6) have been proved experimentally as well as by theoretical NBO calculations, the results insights high electron density on terminal and bridging oxygen atoms of niobate anion. The most negative Natural Bond Orbital charge (NBO) of oxygen in Nb6 is ?1.001, which is a much more negative value than those reported in other polyoxometalates, that corroborates its high basicity thus likely to be employed as a strong base catalyst. Experimental study suggests that Nb6 can efficiently catalyze Knoevenagel condensation of various carbonyl compounds with active methylene compounds neglecting the steric and electronic effect of aromatic aldehydes under mild conditions. Kinetic test shows that Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate exhibits second-order kinetics in the presence of Nb6 and the calculated activation energy is 43.3 kJ mol?1. Meanwhile, a proper mechanism according to the NBO study speculates that the most negative charged terminal oxygens in Nb6 would be pivotal in this transformation.
Isocyanate-functionalized starch as biorenewable backbone for the preparation and application of poly(ethylene imine) grafted starch
Fu, Lixia,Peng, Yanqing
, p. 1547 - 1554 (2017/07/18)
Reactive supports provide versatile platforms for surface decoration, affording various functional materials widely used in chemical and biological research. Considering the biodegradability, biocompatibility, and economy, starch is a suitable support med
Facile One-Pot Synthesis of Amine-Functionalized Mesoporous Silica Nanospheres for Water-Medium Knoevenagel Reaction Under Microwave Irradiation
Zhu, Fengxia,Sun, Xiaojun,Lou, Fengwen,An, Litao,Zhao, Pusu
, p. 1072 - 1079 (2015/02/05)
Amine-functionalized mesoporous silica nanospheres (～80 nm) (NH2-MSNS) were prepared by a co-condensation method using tetraethyl orthosilicate and aminopropyltrimethoxysilane. The catalytic activities of the NH2-MSNS catalysts were
A mechanochemical approach for the construction of carbon-carbon double bonds: Efficient syntheses of aryl/heteroaryl/aliphatic acrylates and nitriles
Jayalakshmi, Lakshmi Narayanan,Karuppasamy, Ayyanar,Stalindurai, Kesavan,Sivaramakarthikeyan, Ramar,Devadoss, Vellasamy,Ramalingan, Chennan
, p. 1322 - 1330 (2017/12/02)
An efficient method for the construction of carbon-carbon double bond has been developed from aromatic aldehydes and compounds with active methylene moieties in the presence of catalytic amount of solid sodium ethoxide via mechanochemical approach. This c
Nano-Fe3O4 encapsulated-silica particles bearing 3-aminopropyl group as a magnetically separable catalyst for efficient knoevenagel condensation of aromatic aldehydes with active methylene compounds
Liu, Shuo,Ni, Yuxiang,Yang, Jianguo,Hu, Huanan,Ying, Anguo,Xu, Songlin
, p. 343 - 348 (2014/05/20)
Knoevenagel condensation of aromatic aldehydes with active methylene compounds such as malononitrile, ethylcyanoacetate, benzimidazol-2-acetonitrile and benzothiazole-2-acetonitrile proceeded very smoothly, catalyzed by nano-Fe3O4 encapsulated-silica particles supported primary amine. Both reaction time and yield are satisfying. The advantages of this catalyst are ease of preparation, non-toxicity, low cost, ease of handling and recyclability. Copyright
Choline chloride and urea based eutectic solvents: Effective catalytic systems for the Knoevenagel condensation reactions of substituted acetonitriles
Liu, Shuo,Ni, Yuxiang,Wei, Wenjing,Qiu, Fangli,Xu, Songlin,Ying, Anguo
, p. 186 - 188 (2014/04/17)
The Knoevenagel condensation of aromatic aldehydes with active methylene compounds such as malononitrile, ethyl cyanoacetate, benzimidazole-2- acetonitrile and benzothiazole-2-acetonitrile proceeded very smoothly, in a reusable and cheap choline chloride and urea based deep eutectic solvents. Both reaction time and yield are satisfactory. The advantages of this catalyst are that it is readily available, biodegradable, non-toxic, low cost and is recyclable.
