4427-94-5Relevant articles and documents
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.]
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.
