Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (10): 954-956.doi: 10.3866/PKU.WHXB19971019

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An ESR Study of Radical Intermediates in Electroreduction of Propargyl Alcohol

Kuang Ya-Fei,Li Guo-Xi,Huang Shu-Kun,Lu Dao-Hui,Chen De-Wen   

  1. College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082|Institute of Chemistry,Academia Sinica,Beijing 100080
  • Received:1997-01-21 Revised:1997-05-18 Published:1997-10-15
  • Contact: Huang Shu-Kun

Abstract:

Electrochemical-ESR technique (ex situ method) with spin traps phenyl tert-butyl nitrone (PBN) and 5,5-dimethyl-1-Pyrroline-1-oxide (DMPO) has been applied to the detection of radical intermediates produced during electroreduction of propargyl alcohol (PA) at platinized platinum electrode in an acidified alcohol-aqua solution. Propargyl radical and H have been detected by PBN and DMPO, respectively. As a result of the discovery of these radicals, an evidence for a radical mechanism of the electroreduction of PA put forward by some authors might be obtained beyond all doubt.

Key words: Propargyl alcohol, Electroreduction, Electrochemical-ESR, Spin trapping