Cu(<scp>ii</scp>)-catalyzed esterification reaction via aerobic oxidative cleavage of C(CO)–C(alkyl) bonds
作者:Ran Ma、Liang-Nian He、An-Hua Liu、Qing-Wen Song
DOI:10.1039/c5cc09146b
日期:——
Novel Cu(II)-catalyzed aerobic oxidative esterification of simple ketones for the synthesis of esters has been developed with wide functional group tolerance. This process is assumed to go through a tandem...
In this research, AgBr supported on an ionic gelation-based nanomaterial, was developed through the aqueous coprecipitation approach for the dendritic fibrous nanosilica (DFNS) production.
Bifunctional Silver(I) Complex-Catalyzed CO<sub>2</sub>Conversion at Ambient Conditions: Synthesis of α-Methylene Cyclic Carbonates and Derivatives
作者:Qing-Wen Song、Wei-Qiang Chen、Ran Ma、Ao Yu、Qiu-Yue Li、Yao Chang、Liang-Nian He
DOI:10.1002/cssc.201402921
日期:2015.3
The chemical conversion of CO2 at atmospheric pressure and room temperature remains a great challenge. The triphenylphosphine complex of silver(I) carbonate was proved to be a robust bifunctional catalyst for the carboxylative cyclization of propargylicalcohols and CO2 at ambient conditions leading to the formation of α‐methylene cyclic carbonates in excellent yields. The unprecedented performance
在大气压和室温下,CO 2的化学转化仍然是一个巨大的挑战。事实证明,碳酸银(I)的三苯基膦配合物是一种强大的双功能催化剂,可在环境条件下对炔丙醇和CO 2进行羧化环化反应,从而以极好的收率形成α-亚甲基环状碳酸酯。[(PPh 3)2 Ag] 2 CO 3的空前性能可能归因于CO 2和炔丙醇的同时活化。此外,催化物种的高度相容的碱性使炔丙醇与CO 2反应导致形成关键的烷基碳酸银中间体:较大的[(Ph 3 P)2 Ag I ] +有效激活碳-碳三键并增强烷基碳阴离子的O-亲核性,从而大大促进了分子内亲核环化。值得注意的是,该催化方案也适用于炔丙醇,仲胺和CO 2(在大气压下)反应以生成β-氧代丙基氨基甲酸酯。
Efficient chemical fixation of CO2 promoted by a bifunctional Ag2WO4/Ph3P system
作者:Qing-Wen Song、Bing Yu、Xue-Dong Li、Ran Ma、Zhen-Feng Diao、Rong-Guan Li、Wei Li、Liang-Nian He
DOI:10.1039/c3gc42406e
日期:——
anion is proposed. Recycling trials on carboxylative cyclization of propargyl alcohols and CO2 illustrate that the catalyst can be reused at least 4 times with retention of high catalytic activity and selectivity. Especially, it allows the direct and effective application in the one-pot synthesis of various oxazolidinones bearing exocyclic alkenes and carbamates in moderate to high yields upon the alternative
通过炔丙醇和CO 2的羧化组装,开发了一种高效的多相银催化的α-亚甲基环状碳酸酯基序的构建反应。在室温下,在无溶剂条件下,仅用1 mol%的Ag 2 WO 4和2 mol%的PPh 3以及大气中的CO 2平稳地进行这种CO 2固定方案,对环境无害且低能耗。简单的操作程序。值得注意的是,仅通过化学选择性就可以达到高达98%的分离的碳酸盐收率。另外,Ag 2 WO 4的双重活化能力面向炔丙基底物和CO 2的基础是,提出了银阳离子和钨酸根阴离子的协同催化机理。炔丙醇和CO 2的羧基环化的循环试验表明,该催化剂可重复使用至少4次,同时保留了高催化活性和选择性。特别地,它允许在交替引入伯胺或仲胺时以中等至高收率直接有效地将各种带有环外烯烃和氨基甲酸酯的恶唑烷酮单锅合成。
Iron complexes of 1,1′-bis(diphenylphosphino)ferrocene (BPPF) as efficient catalysts in the synthesis of carbamates. X-ray crystal structure of (BPPF)Fe(CO)3
作者:Tae-Jeong Kim、Kee-Ha Kwon、Soon-Chul Kwon、Jin-Ook Baeg、Sang-Chul Shim、Dong-Ho Lee
DOI:10.1016/0022-328x(90)85412-r
日期:1990.6
1,1′-Bis(diphenylphosphino)ferrocene (BPPF) reacts with a 5–10 molar excess of Fe(CO)5 to give three new iron complexes (η2-BPPF)Fe(CO)3 (1), (η1-BPPF)Fe(CO)4 (2), and (μ,η1-BPPF)Fe2(CO)8 (3) with the product distribution depending upon reaction conditions. The structure of 1 has been determined. Crystals are monoclinic, space group P21/c, with a 9.708(1), b 16.195(2), c 19.869(5) Å, β 95.75(2)°, V