ESR Study of Intermediates in Electroreduction of 3-Hexyne-2,5-diol

Chem. J. Chinese Universities ›› 2000, Vol. 21 ›› Issue (6): 952.

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ESR Study of Intermediates in Electroreduction of 3-Hexyne-2,5-diol

YUAN Guo-Wei¹, ZHANG Jing-Dong², SONG You-Qun², HUANG Shu-Kun², SUN Jian³

1. Scientific&Technical Research Instituteof Guangz hou No.2 Ligh t Industries, Guangz hou 510170, China;
2. College of Chemistryand Chemical Engineering, Hunan University, Changsha 410082, China;
3. Instituteof Chemistry, Chinese Academy of Sciences, Beijing 100080, China

Received:1999-04-27 Online:2000-06-24 Published:2000-06-24

Abstract

Abstract: The intermediates of electroreduction of 3-hexyne-2,5-diol at platinized platinum electrode in perchlorate aqueous solutions with various pHvalues have been studied by using electrochemical ESRtechnique with the spin trap phenyl tert butyl nitrone. The six-line spectra in the three solutions with 1.5, 3.5 and 5.0 pHvalues could be ascribed to the form of the radicals, such as CH₃C·HC——CCH₂CH₃ , in the process of producing 3-hexyne. The four-line spectra, increasing in their intensities with increase in pHvalues from 1.5 to 5.0, show that a 2-hydroxyalkyl radical CH₃C·(OH)CH=CHCH(OH)CH₃ is formed via the interaction between the atom Hand intermediates 3-hexene-2,5-diol and/or CH₃C(=O)·CH-CHCH(OH)CH₃.

Key words: 3-Hexyne-2,5 diol, Electroreduction, Electrochemical-ESR, Spin trapping

CLC Number:

O646.54

TrendMD:

YUAN Guo-Wei, ZHANG Jing-Dong, SONG You-Qun, HUANG Shu-Kun, SUN Jian . ESR Study of Intermediates in Electroreduction of 3-Hexyne-2,5-diol[J]. Chem. J. Chinese Universities, 2000, 21(6): 952.

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ESR Study of Intermediates in Electroreduction of 3-Hexyne-2,5-diol

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