495-41-0Relevant articles and documents
Solvent responsive self-separation behaviour of Br?nsted acidic ionic liquid-polyoxometalate hybrid catalysts on H2O2 mediated oxidation of alcohols
Kashyap, Niharika,Das, Sukanya,Borah, Ruli
, (2021)
Two solvent responsive self-separative ionic liquid-based POM hybrids [DEDSA]3[PW12O40] and [DEDSA]3[PMo12O40] were prepared by combination of diethyldisulphoammonium chloride [DEDSA]Cl with Keggin phosphotungstic acid and phosphomolybdic acid. Properties like water tolerance, high activity, high thermal stability and reusability in these POM hybrid compounds facilitate a new type of POM based catalysis used for oxidation of organic alcohols using hydrogen peroxide as oxidizing agent. Due to varied solubility of the hybrid with different solvents, the hybrid can effectively catalyze the oxidation reaction in homogenous condition and then can finally switch back to heterogenous system and convert as self-precipitating catalyst on addition of suitable solvent at the end of the reaction, which made the recovery and reuse of the hybrid very convenient. The catalysts are characterized via different analytical and spectroscopic tools like FT-IR, 1H NMR, 13C NMR, 31P NMR, TGA, UV–Visible, Powder XRD techniques, Raman etc. It was found that the prepared material was highly acidic, thermally stable in nature and was recycled up to 7 times without much loss of catalytic activity.
Modular access to 1,2-allenyl ketones based on a photoredox-catalysed radical-polar crossover process
Du, Chan,Fang, Jianghua,Fang, Yewen,Lei, Wan,Li, Yan,Liu, Yongjun
supporting information, p. 8502 - 8506 (2021/10/20)
Herein, a new protocol dealing with the preparation of 1,2-allenyl ketones has been successfully developedviathe reactions of enynes with radicals enabled by dual photoredox/copper catalysis. Based on the results of a deuteration experiment and the competition reaction between cyclopropanation and allenation, the mechanism based on a photoredox-neutral-catalysed radical-polar crossover process has been proposed. Synthetic applications of allenes have also been demonstrated.
Generation of α-Boryl Radicals and Their Conjugate Addition to Enones: Transition-Metal-Free Alkylation of gem-Diborylalkanes
Wu, Chaoqiang,Bao, Zhicheng,Dou, Bowen,Wang, Jianbo
supporting information, p. 2294 - 2298 (2021/01/18)
A transition-metal-free method for the alkylation of gem-diborylalkanes with α,β-unsaturated ketones has been developed. It is demonstrated that the α-boryl radicals can be generated efficiently from gem-diborylalkanes with the aid of catechol and oxidants. The α-boryl radicals formed through such process can be engaged in conjugate addition reaction with α,β-unsaturated ketones. This transformation is a straightforward method for the synthesis of γ-borylketones.