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Registration Number

0213U003296, 0112U003588 , R & D reports

Title

Generation of basic foundation of new electron-induced activation processes for "litle" molecules (freons С1-С2, СО2, etc .) and their inclusion into the synthesis of valuable organic compounds

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Head

Koshechko Vyacheslav Grigorevich,

Registration Date

24-01-2013

Organization

L.V.Pysarzhevsky Institute of Physical Chemistry of National Academy of Science of Ukraine

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Processes of electrochemical and electrocatalytical activation of vicinal freons (CF2ClCFCl2, CF2BrCF2Br, CF2BrCFClBr) and its dehalogenation yielding valuable fluoroethylenes were studied. It was shown that polyfluoroalkylhalogenides are electrochemically reduced in the wide potential range (Ep = -1.06-2.12 В) depending on structure and material of electrodes (GC, Ag). The shift of the potential of cathodic activation of freons to less negative range and current growth from GC-electrode to silver one explained by catalytic effect of Ag were established.The possability of anion-radicals of few aromatic compounds (p-dicyanobenzene, p-diacethylbenzene, fluoranthene, perylene, etc) and sulfure dioxide to be electron transfer mediator in processes of electrochemical activation of vicinal freons was demonstrated. These mediators allow to activate freons in energy saving conditions with high yields of fluoroethylenes (about 98%). The possibility of activation of freons as cheap source of fluoroalkyl groups for functionalization of different organic substrates by freons was explored, specifically of thiophenols to yield polyfluoroalkylarylsulfides - bioactive compounds. The homogeneous catalytic activating system was developed consisting of organic base, specifically of substituted pyridine, that due to complexating with thiophenol raises electrone donating ability of thiophenol, and electron transfer mediator from thiophenol complex to freon - the cheap but effective catalyst sulfur dioxide. This system enable to carry out electron induced freon activation in mild conditions generating active fluoroalkyl radicals which are capable of thiophenol alkylation yielding polyfluoroalkylaryl sulfides XC6H4SCFClCF2Br (X=H, CH3) (near 88%).

Product Description

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Кипріанова Лідія Андріївна
Мішура Андрій Михайлович
Тітов Володимир Євгенович

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2020-04-02