Electrochemical reduction of unsaturated nitriles in acetonitrile and nitromethane

James Y. Becker, Theodore A. Koch

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The electrochemical reduction of five conjugated and non-conjugated nitriles, CH3CHCHCN (1a, trans/cis = 62/38%); CH3CH2CHCHCN (1b, cis); CH3CHCHCH2CN (1c, trans), CH3CHC(CH3)CN (1d) and CH2CHCH(CH3)CN (1e) have been investigated in acetonitrile, and of two derivatives, 1a and CH2C(CH3)CN (1f) in nitromethane. The results show that unlike activated nitriles which undergo the known electrohydrodimerization (EHD) process in protic media, forming "tail-to-tail" dimeric products, the dimerization in acetonitrile affords mainly "head-to-tail" dimers and other products involving addition of "H" and "CH2CN" moieties to the carbon-carbon double bond. Moreover, it is noteworthy that the electrochemical dimerization in acetonitrile affords branched dinitriles with an odd number of carbons between the two nitrile groups, rather than the common dimers with an even number of carbons. This type of dimer could serve as a precursor for branched diamines (and diacids) in the polyamide industry. In nitromethane, no dimeric but "condensation" products were formed, involving one molecule of solvent and one or two molecules of nitrilic substrate.

Original languageEnglish
Pages (from-to)2067-2071
Number of pages5
JournalElectrochimica Acta
Volume39
Issue number13
DOIs
StatePublished - 1 Jan 1994

Keywords

  • cyanonitroalkanes.
  • dinitriles
  • electrohydrodimerization (EHD)
  • unsaturated nitriles

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Electrochemistry

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