4427-94-5Relevant academic research and scientific papers
Dicobaloxime/organodicobaloximes bridged by different axial groups: Synthesis, characterization, spectroscopy, and catalysis
Kilic, Ahmet,Flrat, Hamza,Aytar, Emine,Durgun, Mustafa,Baytak, Aysegul Kutluay,Aslanoglu, Mehmet,Ulusoy, Mahmut
, p. 1705 - 1720 (2017/09/02)
In this study, the various ligands axially coordinated to two cobalt center bound to the N4-oxime core in 12 new dicobaloxime/organodicobaloxime (1-12) complexes have been synthesized and characterized by NMR (1H and 13C), UV-Visible, FT-IR, LC-MS, molar conductivity analysis, melting point, and magnetic susceptibility experiments with elemental analysis. These spectroscopic results indicate that the formation of new dicobaloxime/organodicobaloxime (1-12) complexes. The (C=N-OH) peaks disappeared in the 1H-NMR spectrum of dicobaloxime/organodicobaloxime (1-12) complexes, while new peaks were observed at range 20.18-18.33 ppm, indicating that the groups of ligands have been transformed to intramolecular H-bridge (O-H?O). The dicobaloxime (1-6) species give a better cyclic voltammogram as compared to its organodicobaloxime derivatives (7-12) due to cyclic voltammograms of the organodicobaloximes (7-12) were poor. This is possibly due to the enhanced σ donation by R groups in the organocobaloximes which are substantially stabilized. The organodicobaloxime (10) showed much better catalytic activity compared to the other cobaoxime complexes. Graphical Abstract: The different dicobaloxime (1-6) and organodicobaloximes (7-12) have been synthesized for the first time. Their redox properties were investigated using cyclic voltammetric (CV) techniques in a DMSO solution. These dicobaloximes/organodicobaloximes have been used as homogeneous catalyst for synthesis of cyclic carbonates presence of DMAP as co-catalyst.[Figure not available: see fulltext.]
Method using water as solvent to synthesize cyclic carbonate
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Paragraph 0025; 0026, (2016/10/10)
The invention relates to a method using water as the solvent to synthesize cyclic carbonate. The method includes: using CO2 and epoxide as raw materials and alkali halide as the catalyst, adding the catalyst into a reaction system in an aqueous solution form, allowing water to participate in the reaction as the solvent, adding or not adding a nitrogen-containing compound as the auxiliary catalyst during the reaction, performing stirring reaction at 40-150 DEGC and under the reaction pressure of 0.5-10MPa for 1-12 hours, directly separating the water phase and the oil phase after the reaction, and obtaining the cyclic carbonate from the oil phase. The method has the advantages that the catalyzing system provided by the method is low in cost, high in catalytic activity, easy in separation, reusable, and promising in industrial application prospect.
Process for the manufacture of alkylene carbonates
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, (2008/06/13)
A new process is disclosed for the synthesis of alkylene carbonates having from 2 to 4 carbon atoms in the chain, starting from a corresponding halohydrin having the formula: STR1 wherein Ra, Rb, Rc and Rd are independently hydrogen or alkyl, aryl, alkylaryl or arylalkyl radicals and where X is a halogen, characterized in that said halohydrin is reacted with a bicarbonate of a quaternary -onium compound, where "-onium" means ammonium, phosphonium, arsonium or stibonium, preferably using an organic solvent as diluent and operating in the presence of carbon dioxide.
