- Synthesis and spectral properties of 6(1H)-oxopyridine-2,3-dicarboxylic acid and metal porphyrazines based thereon
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Oxidation of quinolin-2-ol with potassium permanganate in alkaline medium gave 6(1H)-oxo-pyridine-2,3-dicarboxylic acid. The latter was reacted with urea in the presence of ammonium molybdate and bivalent metal chlorides to obtain the corresponding metal porphyrazines.
- Galanin,Kudrik,Maizlish,Shaposhnikov
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- Oxidation of 2- and 3-Halogenated Quinolines: An Easy Access to 5- and 6-Halogenopyridine-2,3-dicarboxylic Acids
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Pyridine-2,3-dicarboxylic acids bearing an halogen in the position α or β to the nitrogen atom were synthesized by oxidation of the corresponding quinolines. Two methods, using either ozone followed by hydrogen peroxide or ruthenium tetroxide under catalytic conditions were used. Diacids 1b,c and 2a-c substituted in 6-position by a chlorine or bromine and in 5-position by a fluorine, chlorine or bromine, respectively, were isolated in yields ranging from 46-71 percent. Yields of 6-fluoro and 6- or 5-iodo diacids 1a,d and 2d did not exceed 30 percent.
- Bas, Marie-Delphine Le,Gueret, Caroline,Perrio, Cecile,Lasne, Marie-Claire,Barre, Louisa
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p. 2495 - 2499
(2007/10/03)
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- 5 (and/or 6) substituted 2-(2-imidazolin-2-yl)nicotinic acids, esters and salts, useful as herbicidal agents and novel intermediates for the preparation of said nicotinic acids, esters and salts
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There are provided novel 5(and/or 6)substituted 2-(2-imidazolin-2-yl) and 2-(2-imidazolidinyl)nicotinic acids, esters and salts, which are useful as herbicidal agents. There are also provided novel substituted pyrrolopyridine acetonitriles, pyrrolopyridin
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- CONTROLLED, REGIOSPECIFIC OXIDATION OF PYRIDINE CARBOXYLIC ACIDS AND ESTERS WITH ELEMENTAL FLUORINE
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Pyridine carboxylic acid salts or esters in water or water-acetonitrile mixtures were treated with elemental fluorine to give the corresponding 2-pyridones.
- Puy, Michael Van Der,Nalewajek, David,Wicks, Gene E.
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p. 4389 - 4392
(2007/10/02)
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