No abstract

The reaction of 9-bromoanthracene (1) with benzenethiol(ate) in tetraglyme proceeds by a SNAr mechanism. The concurrent formation of anthracene is not due to a competing single-electron-transfer pathway involving either benzenethiol or benzenethiolate anion.The involvement of single-electron-transfer (SET) pathways in organic chemistry is a topic of fundamental importance (for reviews, see [l]). The occurrence of chain mechanisms involving radical anions for the substitution of both alkyl and aryl halides, the S,,1 mechanism, was delineated [2]. Quite recently, however, a mechanistic reappraisal of the involvement of aryl 0 radicals in the S,,1 substitution of aryl halides appeared [3a] (for references to the S,,2 mechanism, see [3b]).The substitution of 9-bromoanthracene (1) with sodium benzenethiolate (2a) in the solvent tetraglyme ( = 2,5,8,11,14-pentaoxapentadecane) gave, besides te expected substitution product 9-(pheny1thio)anthracene (3), the reduction product anthracene (4) [4] [5] (see Scheme). It was reasonably suggested that the formation of 4 was the result of a SET

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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.