- A Highly Stable Organic Radical Cation
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Functionalization of a methylviologen with four methyl ester substituents significantly facilitates the first two reduction steps. The easily generated radical cation shows markedly improved air stability compared to the parent methylviologen, making this derivative of interest in organic electronic applications.
- Berville, Mathilde,Richard, Jimmy,Stolar, Monika,Choua, Sylvie,Le Breton, Nolwenn,Gourlaouen, Christophe,Boudon, Corinne,Ruhlmann, Laurent,Baumgartner, Thomas,Wytko, Jennifer A.,Weiss, Jean
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- Rigid and Compact Binuclear Bis-hydrated Gd-complexes as High Relaxivity MRI Agents
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The first binuclear Gd-complex of the 12-membered pyridine-based polyaminocarboxylate macrocyclic ligand PCTA was synthesized by C?C connection of the pyridine units through two different synthetic procedures. A dimeric AAZTA-ligand was also synthesized w
- Leone, Loredana,Guarnieri, Luca,Martinelli, Jonathan,Sisti, Massimo,Penoni, Andrea,Botta, Mauro,Tei, Lorenzo
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p. 11811 - 11817
(2021/07/09)
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- A Convenient Synthesis of 2,2',6,6'-Tetramethyl-4,4'-bipyridine and Its Oxidation to 2,2',6,6'-Tetracarboxy-4,4'-bipyridine
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By reaction of 2,6-dimethylpyridine (1b) with sodium the tetrahydro-4,4'-bipyridine bis-sodium salt 2b is formed.Of different dehydrogenation reagents tested, only sulfur dioxide affords the title compound 3b, in 49percent overall yield.By oxidation of 3b with chromium trioxide, 2,2',6,6'-tetracarboxy-4,4'-bipyridine (3c, 70percent) is produced, a valuable precursor for several 2,2',6,6'-tetrasubstituted 4,4'-bipyridines, e.g., the corresponding acid chloride 3d and the carboxylic esters 3e and 3f.
- Huenig, Siegfried,Wehner, Ingeborg
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p. 552 - 554
(2007/10/02)
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