4843-46-3Relevant academic research and scientific papers
The direct carboxylation of terminal alkynes with carbon dioxide
Dingyi, Yu,Yugen, Zhang
, p. 1275 - 1279 (2011)
A simple and straight-forward method has been developed for direct carboxylation of terminal alkynes using CO2 as the C1 carbon feedstock. The direct C-H bond functionalization is achieved with Cs 2CO3 as the base and in the absence of transition metal catalyst. Various propiolic acids were synthesized in good to excellent yields with a wide substrate scope and a good functional groups tolerance. This is a more atom- and step-economic protocol with great potential in practical application.
AgNPs encapsulated by an amine-functionalized polymer nanocatalyst for CO2 fixation as a carboxylic acid and the oxidation of cyclohexane under ambient conditions
Salam, Noor,Paul, Priyanka,Ghosh, Swarbhanu,Mandi, Usha,Khan, Aslam,Alam, Seikh Mafiz,Das, Debasis,Manirul Islam, Sk.
, p. 5448 - 5456 (2020/04/17)
Silver nanoparticles (AgNPs) embedded in a porous polystyrene material (AgNPs@m-PS-PC) were synthesized via the polymerization of polystyrene amine and 2-pyridinecarbaldehyde, followed by the reduction of silver nitrate in methanol. The structure and morphology of this porous material were characterized by powder X-ray diffraction, transmission electron microscopy (TEM), scanning electron microscopy, Fourier-transform infrared, ultraviolet-visible, and atomic absorption spectroscopies, and thermogravimetric analysis. TEM showed that the AgNPs were well dispersed in the polymeric matrix, with dimensions of around 4-9 nm. This nanocatalyst showed activity, particularly for the green synthesis of valuable carboxylic acids by the carboxylation reaction of terminal alkynes with carbon dioxide under atmospheric pressure. Additionally, the catalyst displayed efficient catalytic activity for the oxidation of cyclohexane using hydrogen peroxide as the oxidising agent. The AgNPs@m-PS-PC nanocatalyst could be recycled five times and retained reliable efficiency.
Carboxylation of terminal alkynes with CO2 using novel silver N-heterocyclic carbene complexes
Li, Shanshan,Sun, Jing,Zhang, Zhizhi,Xie, Ruixia,Fang, Xiangchen,Zhou, Mingdong
, p. 10577 - 10584 (2016/07/07)
Four novel N-heterocyclic carbene (NHC) silver complexes, I-IV, have been synthesized and characterized. The single X-ray crystal diffraction data indicate a dinuclear solid-state structure for I and III and a mononuclear structure for II and IV. These complexes have been successfully used as efficient catalysts for the C-H activating carboxylation of terminal alkynes with CO2. A wide range of substrates with various functional groups afforded the corresponding aryl or alkyl substituted propiolic acids in good yields under mild conditions. Moreover, the role of bases and the reaction mechanism is thoroughly discussed.
Carboxylation of terminal alkynes with CO2 catalyzed by bis(amidate) rare-earth metal amides
Cheng, Hao,Zhao, Bei,Yao, Yingming,Lu, Chengrong
, p. 1675 - 1682 (2015/03/18)
Three novel bis(amidate) rare-earth metal amides {LRE[N(SiMe3)2]·THF}2 (H2L = N,N′-(cyclohexane-1,2-diyl)bis(4-tert-butylbenzamide); RE = La(1), Nd(2), Y(3)), which were prepared by the treatment of the bridged amide proligand H2L with RE[N(SiMe3)2]3 in tetrahydrofuran, have been characterized by single-crystal X-ray diffraction, elemental analyses, and NMR for complexes 1 and 3. All the complexes were found, for the first time, to be efficient catalysts for the direct carboxylation of terminal alkynes with CO2 at ambient pressure. And the Nd-based catalyst 2 showed the highest reactivity. Various propiolic acids with a good functional group tolerance were successfully synthesized in high-to-excellent yields under mild conditions. This journal is
