Abstract
Abstract Selective synthesis of bis- N -hydroxyimidazolidines based on pyridines, 2,2′-bipyridines, 1,10-phenanthroline, pyridazine and 1,8-naphthyridine from the corresponding dialdehydes and N,N′ -dihydroxy-2,3-diamino-2,3-dimethylbutane in the presence of catalytic amounts of SeO 2 . Mild oxidation afforded the corresponding stable imino-nitroxide biradicals 4 to 11 .
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