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  • Electron-transfer mechanism in radical-scavenging reactions by a vitamin E model in a protic medium.

Electron-transfer mechanism in radical-scavenging reactions by a vitamin E model in a protic medium.

Organic & biomolecular chemistry (2005-02-11)
Ikuo Nakanishi, Tomonori Kawashima, Kei Ohkubo, Hideko Kanazawa, Keiko Inami, Masataka Mochizuki, Kiyoshi Fukuhara, Haruhiro Okuda, Toshihiko Ozawa, Shinobu Itoh, Shunichi Fukuzumi, Nobuo Ikota
ABSTRACT

The scavenging reaction of 2,2-diphenyl-1-picrylhydrazyl radical (DPPH.) or galvinoxyl radical (GO.) by a vitamin E model, 2,2,5,7,8-pentamethylchroman-6-ol (1H), was significantly accelerated by the presence of Mg(ClO4)2 in de-aerated methanol (MeOH). Such an acceleration indicates that the radical-scavenging reaction of 1H in MeOH proceeds via an electron transfer from 1H to the radical, followed by a proton transfer, rather than the one-step hydrogen atom transfer which has been observed in acetonitrile (MeCN). A significant negative shift of the one-electron oxidation potential of 1H in MeOH (0.63 V vs. SCE), due to strong solvation as compared to that in MeCN (0.97 V vs. SCE), may result in change of the radical-scavenging mechanisms between protic and aprotic media.

MATERIALS
Product Number
Brand
Product Description

Supelco
2,6-Lutidine, analytical standard
Sigma-Aldrich
Galvinoxyl, free radical
Sigma-Aldrich
2,6-Lutidine, ReagentPlus®, 98%
Sigma-Aldrich
2,6-Lutidine
Sigma-Aldrich
2,6-Dimethylpyridine, ≥99%