Heteroaromatic radicals heteroatoms

Cf. also Hanson, P. Heteroaromatic Radicals, Part I General Properties Radicals with Group V Ring Heteroatoms. In Adv. Heteroc. Chem. 25, 205 (1979)... 

Heteroaromatic Radicals, Part II Radicals with Group VI and Groups V and VI Ring Heteroatoms P. Hanson, Adv. Heterocycl. Chem., 1980, 27, 32-149. 

Heteroatoms also influence the charge carried by heteroaromatic radicals, just as they influence that of diamagnetic aromatic species. Thus, addition of an electron to the aromatic cations 15 and 16 yields radicals which are, respectively, neutral and cationic, albeit isoelectron ic with benzene anion-radicals. 

Volume 27 contains four contributions. Black and Doyle discuss l-Azabicyclo[3.1.0]hexanes and Analogs with Further Heteroatom Substitution. Part II of the treatment of Heteroaromatic Radicals by Hanson deals with radicals with group VI heteroatoms and completes the review of the heteroaromatic free radicals begun in Volume 25. In The 1,2- and 1,3-Dithiolium Ions, Lozac h and Stavaux bring up to date the review by Prinzbach and Futterer which appeared in 1966 in Volume 7 of this publication. Finally, Grimmett has updated his own review of imidazole chemistry which appeared in 1970 in Volume 12. 

One-electron oxidation of organoselenium and organotellurium compounds results in initial formation of a radical cation (equations (19) and (20)). The eventual fate of the radical cation depends on several variables, but is typically a Se(lV) or Te(lV) compound. The scope of this section will be the one-electron oxidation of selenides and tellurides that are not contained in a heteroaromatic compound, and ones in which the Se and Te are bonded to two carbons, rather than to other heteroatoms. Tellurium- and selenium-containing electron donor molecules have been reviewed. 

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