A combination of trimethylsilyl chloride and hydrous natural montmorillonite clay: an efficient solid acid catalyst for the azidation of benzylic and allylic alcohols with trimethylsilyl azide
Influence of steric demand on ruthenium-catalyzed cycloaddition of sterically hindered azides
作者:Venkata S. Sadu、Sirisha Sadu、Seji Kim、In-Taek Hwang、Ki-Jeong Kong、Kee-In Lee
DOI:10.1039/c6ra25403a
日期:——
The RuAAC of sterically hindered 2,2-diaryl-2-azidoamines and terminal alkynes resulted in the unprecedented formation of 1,4-disubstituted-1,2,3-triazoles. A control experiment with 2-(azidomethyl)pyrrolidine revealed the usual selectivity with RuAAC and the reactions of azides with intermediate bulkiness gave mixtures of 1,4- and 1,5-regioisomers. The results suggest that the steric demands could
Mononuclear Copper Complexes with Tridentate Tris(<i>N</i>-heterocyclic carbene): Synthesis and Catalysis of Alkyne–Azide Cycloaddition
作者:Changhyeon Seo、Yeon-Joo Cheong、Woojin Yoon、Jaegyeom Kim、Jinho Shin、Hoseop Yun、Seung-Joo Kim、Hye-Young Jang
DOI:10.1021/acs.organomet.0c00457
日期:2021.1.11
Mononuclear coppercomplexes modified with tridentate tris(N-heterocycliccarbene) (triscarbene) ligands are synthesized. The structures of the copper–triscarbene complexes are characterized using X-ray crystallography, X-ray absorption near edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) analyses. These copper–triscarbene complexes are utilized for the cycloaddition of
Cu2O nanocrystals with various morphology: Synthesis, characterization and catalytic properties
作者:Mojtaba Bagherzadeh、Narges-alsadat Mousavi、Mojtaba Amini、Sanjeev Gautam、Jitendra Pal Singh、Keun Hwa Chae
DOI:10.1016/j.cclet.2017.01.022
日期:2017.5
catalyze the 1,3-dipolarcycloaddition reaction for the synthesis of 1,4-disubstituted triazoles. Cu2O nanocubes and octahedral showed the superior catalytic performance in the cycloaddition reaction. These results reveal that crystal-plane engineering of oxide catalysts is a useful strategy for developing efficient catalysts for organic reaction.
Cuprous oxide (Cu2O) nanoparticles were prepared by two simple methods and their structural, morphological and electronic properties were investigated by X-ray diffraction analysis, X-ray absorption near-edge structure, energy dispersive X-ray analysis and scanning electron microscopy. Cuprous oxide nanoparticles efficiently catalyse 1,3-dipolar cycloaddition of a variety terminalalkynes and organic
通过两种简单的方法制备了氧化亚铜 (Cu2O) 纳米粒子,并通过 X 射线衍射分析、X 射线吸收近边结构、能量色散 X 射线分析和扫描电子显微镜研究了它们的结构、形态和电子性质。氧化亚铜纳米粒子有效地催化各种末端炔烃和有机叠氮化物的 1,3-偶极环加成反应,在不使用任何添加剂的情况下以优异的产率生成相应的 1,2,3-三唑衍生物。选择苯乙炔和苄基氯作为模型起始化合物,用于优化反应条件,例如在 a-Cu2O 纳米粒子作为催化剂存在下溶剂的影响、反应温度和反应时间。结果表明,使用氧化亚铜纳米粒子(0. 035 mmol) 并在 70 °C 的水中加热,苯乙炔与苄基氯和叠氮化钠的反应在 6 小时的反应时间内几乎定量地得到 1-苄基-4-苯基-1H-1,2,3-三唑。对催化剂的可回收性和可重复使用性的研究表明,a-Cu2O 可以重复使用至少 5 次而不会显着降低产率。
Polyoxomolybdate-stabilized Cu<sub>2</sub>O nanoparticles as an efficient catalyst for the azide–alkyne cycloaddition