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Pyridines nitronyl nitroxides

Oxidation of the pyrazole carboxaldehydes 294 using potassium permanganate in aqueous pyridine gave satisfactory yields of the carboxylic acids 295 (Equation 56) <2001CHE467>. Condensation of AT-alkylpyrazole-4-carbaldehyde 296 with 2,3-bis(hydroxyamino)-2,3-dimethylbutane sulfate, then sodium periodate oxidation of 1,3-dihydroxyimi-dazolidine 297 afforded pyrazolyl nitronyl nitroxides 298 (Scheme 26) <2001ARK55>. Another approach to... [Pg.50]

Stable free radicals are employed in a variety of studies requiring spin labels, MRI, antioxidants, or magnetic materials. Elongated ethynyl-bridged radicals 7 and 10 based on pyridine- and bipyridine-substituted nitronyl nitroxide (NTT) radicals are also prepared by... [Pg.496]

Scheme 44 Incorporation of nitronyl nitroxides into the pyridine ring... Scheme 44 Incorporation of nitronyl nitroxides into the pyridine ring...
Scheme 15 Reaction of pyridine iV-oxide with lithium nitronyl nitroxide... Scheme 15 Reaction of pyridine iV-oxide with lithium nitronyl nitroxide...
See other pages where Pyridines nitronyl nitroxides is mentioned: [Pg.479]    [Pg.400]    [Pg.160]   
See also in sourсe #XX -- [ Pg.29 ]



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