2169-69-9Relevant articles and documents
Size control of catalytic reaction space by intercalation of alkylcarboxylate anions into Ni-Zn mixed basic salt interlayer: Application for knoevenagel reaction in water
Hara, Takayoshi,Kurihara, Jun,Ichikuni, Nobuyuki,Shimazu, Shogo
, p. 304 - 305 (2010)
The interlayer space of layered Ni-Zn mixed basic salt (NiZn) can be controlled precisely by the intercalation of various carboxylate anions with long alkyl chains via simple anion exchange. Expansion of interlayer space in the anion-exchanged NiZn depend
Nitrogen-containing porous cerium trimetaphosphimate as a new efficient base catalyst
Yi, Jianglong,Fu, Zhiyong,Liao, Shijun,Song, Desheng,Dai, Jingcao
, p. 6144 - 6147 (2011)
A new layer nitrogen-containing porous cerium trimetaphosphimate with pendant NH groups projecting into the channels has been synthesized and characterized. Knoevenagel condensation of benzaldehyde and ethyl cyanoacetate is carried out with this complex a
2-pyrrolidinecarboxylic acid ionic liquid catalyzed knoevenagel condensation
Song, Hongbing,Yu, Yinghao,Chen, Xuewei,Li, Xuehui,Xi, Hongxia
, p. 666 - 669 (2012)
The pyrrolidinecarboxylic functionalized ionic liquid, 1-butyl-3- methylimidazolium-(S)-2-pyrrolidinecarboxylic acid salt ([bmim][Pro]), was prepared using an improved procedure. α,β-Unsaturated carbonyl compounds were selectively synthesized and high yie
Comparison of the alkalinity of hydroxypyridine anion-based protic ionic liquids and their catalytic performance for Knoevenagel reaction: The effect of the type of cation and the position of nitrogen atom of anion
Xie, Bin,Xu, Yingjie,Tang, Xiaochen,Shu, Hegang,Chen, Tingting,Zhu, Xiao
, p. 610 - 616 (2018)
The design of acidity and alkalinity is an important characteristic of ionic liquids, and it also affects their application. For this reason, the alkalinity of six hydroxypyridine anion-based protic ionic liquids (PILs) was determined by potentiometric ti
Synthesis, structure, luminescence and catalytic properties of cadmium(ii) coordination polymers with 9H-carbazole-2,7-dicarboxylic acid
Yi, Xiu-Chun,Huang, Meng-Xuan,Qi, Yan,Gao, En-Qing
, p. 3691 - 3697 (2014)
Two Cd(ii) metal-organic frameworks were synthesized from the NH-functionalized dicarboxylate ligand 9H-carbazole-2,7-dicarboxylic acid (2,7-H2CDC). Compound 1, [Cd4(CDC)4(DMF) 4]·4DMF·4H2O, displays
Introduction of bis-imidazolium dihydrogen phosphate as a new green acidic ionic liquid catalyst in the synthesis of arylidene malononitrile, ethyl (E)-3-(aryl)-2-cyanoacrylate and tetrahydrobenzo[b]pyran derivatives
Rahmatizadeh-Pashaki, Zahra,Daneshvar, Nader,Shirini, Farhad
, p. 2135 - 2149 (2021/02/01)
In this work, [H2-Bisim][H2PO4]2 as a novel bis-imidazole-based acidic ionic liquid has been synthesized and characterized with a variety of techniques including FT-IR, 1H, 13C, 31/su
A facile, efficient and solvent-free titanium (IV) ethoxide catalysed knoevenagel condensation of aldehydes and active methylenes
Ramaiah, Manjunatha M.,Shivananju, Nanjunda Swamy,Shubha, Priya Babu
, p. 107 - 115 (2020/02/04)
Titanium ethoxide has been employed as a novel and efficient reagent for the Knoevenagel condensation of aldehydes with active methylenes such as diethyl malonate and ethyl cyanoacetate under solvent free conditions to afford substituted olefins in high to excellent yields. The reaction is suitable for a variety of aromatic, aliphatic and heteroaromatic aldehydes with various active methylenes. Parallel to this, microwave irradiation has been utilized to achieve improved reaction rates and enhanced yields. Herein, we illustrated a convenient method for the preparation of α,β-unsaturated compounds using both conventional and microwave irradiation methods. An efficient and solvent free Knoevenagel condensation between aldehydes and active methylenes was developed using titanium ethoxide. The procedure proved to be successful with a wide range of substrates such as aromatic, aliphatic and heterocyclic aldehydes and various active methylenes to afford substituted olefins. The reaction was also carried out under microwave irradiation to accomplish the corresponding olefins with improved reaction rates, yields and cleaner reaction profiles.We have developed an efficient and novel methodology for the synthesis of olefinic compounds by Knoevenagel condensation under solvent-free conditions using titanium ethoxide, for the first time, as a reagent as well as a solvent. This method is appropriate for the synthesis of a variety of aromatic aldehydes containing various electron-donating and withdrawing groups, aliphatic and heteroaromatic aldehydes. The significant advantages offered by this methodology could be applied to various active methylenes in order to offer the corresponding Knoevenagel products. Thus, we believe that this method delivers high conversions, cleaner reaction profiles under solvent-free reaction conditions and shorter reaction times, all of which make it a very useful and attractive approach for the preparation of a wide range of substituted olefins.
