1792-17-2Relevant articles and documents
Penicillium expansum lipase-coated magnetic Fe3O 4-polymer hybrid hollow nanoparticles: A highly recoverable and magnetically separable catalyst for the synthesis of 1,3-dibutylurea
Liu, Jun,Wang, Wenjing,Liu, Huiwen,Zhou, Yaoliang,Zhang, Haibo,Zhou, Xiaohai
, p. 25983 - 25992 (2014)
Herein, amino-epoxy supports were innovatively imported onto magnetic nanoparticles (Fe3O4-polymer hybrid nanospheres) for immobilizing enzymes. This new support has a coating layer with dual functional groups (epoxy and amino-epoxy). Consequently, this support has great anionic exchange power and a high number of epoxy groups. The acquired immobilized Penicillium expansum lipase in combination with this heterofunctional support represents a novel class of heterogeneous catalyst towards the synthesis of 1,3-dibutylurea from ethylene carbonate and butylamine, which has not been very commonly catalyzed by enzymes. After optimization of the reaction conditions, the yield of 1,3-dibutylurea was 77% under solvent free conditions at 60 °C. Moreover, after completion of reaction, the catalyst was simply recovered by an external conventional magnet and recycled without significant loss in the catalytic activity (up to ten cycles). the Partner Organisations 2014.
Non-Fullerene Small Molecule Acceptors Containing Barbituric Acid End Groups for Use in High-performance OPVs
Choe, Jong-chan,Lee, Tae Ho,Lim, Eunhee
, p. 20 - 23 (2019)
We synthesized two new bithiophene-based small molecules, TT-BBAR, and TT-OBAR, having butyl- and octyl-substituted barbituric acid (BAR) groups, respectively, via a well-known synthetic method, the Knoevenagel condensation, in high yield. These small mol
Lautenberger et al.
, p. 1110 (1968)
METHOD FOR PRODUCING CARBON DIOXIDE DERIVATIVE
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Paragraph 0033-0034; 0037, (2021/06/25)
PROBLEM TO BE SOLVED: To provide a method for producing a useful carbon dioxide derivative from carbon dioxide with low energy. SOLUTION: An amine is caused to absorb carbon dioxide, and without separating the carbon dioxide, it is then reacted with an acid catalyst and an olefin, thereby producing a carbon dioxide derivative, which serves as a raw material for polyurethane. SELECTED DRAWING: None COPYRIGHT: (C)2021,JPOandINPIT
Hydrosilane-Assisted Synthesis of Urea Derivatives from CO2and Amines
Zhao, Yulei,Guo, Xuqiang,Si, Zhiyao,Hu, Yanan,Sun, Ying,Liu, Yunlin,Ji, Zhongyin,You, Jinmao
, p. 13347 - 13353 (2020/11/02)
A methodology employing CO2, amines, and phenylsilane was discussed to access aryl- or alkyl-substituted urea derivatives. This procedure was characterized by adopting hydrosilane to promote the formation of ureas directly, without the need to prepare silylamines in advance. Control reactions suggested that FeCl3 was a favorable additive for the generation of ureas, and this 1,5,7-triazabicyclo[4.4.0]dec-5-ene-catalyzed reaction might proceed through nucleophilic addition, silicon migration, and the subsequent formal substitution of silylcarbamate.