A. Vereshchagin, E. O. Dorofeeva, M. Elinson
Dec 25, 2019
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Journal
Arkivoc
Abstract
Pyridinium bromide has been tested as a new mediator for electrochemical transformations in methanol and acetonitrile. An efficient protocol for the synthesis of cyclopropanes via the electrochemical transformations of alkylidenemalononitriles and C-H acids (malononitrile, malonic ester, N,N-dimethylbarbituric acid, pyrazolin-5-ones) has been developed. The chemistry proceeds in a simple undivided cell under constant current conditions employing a substoichiometric amount of PyHBr that serves both as a redox catalyst and a supporting electrolyte; in this manner additional conducting salt is not required.