- Method for producing substituted pyridine-carboxylic acids
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An improved process for the preparation of substituted pyridinecarboxylic acids (II), useful as herbicide intermediates, by ozonolysis of quinolines (I).
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Page column 4
(2008/06/13)
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- Substituted semi-carbazones and related compounds
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Substituted semicarbazones, thiosemicarbazones and isothiosemicarbazones and salts thereof, intermediates therefor, synthesis thereof, and the use of said compounds for the control of weeds.
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- Compounds
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Substituted semicarbazones, thiosemicarbazones and isothiosemicarbazones and salts thereof, intermediates therefor, synthesis thereof, and the use of said compounds for the control of weeds.
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- Ozonolysis of Quinolines: A Versatile Synthesis of Polyfunctional Pyridines
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A simple, safe and efficient procedure, easily adapted to a large scale, is described for the synthesis of substituted quinolines 2, which are readily oxidized by ozone in the presence of mineral acid, followed by an oxidative work up with hydrogen peroxide to afford substituted 2,3-pyridinedicarboxylic acids 3a-d,f and acyl pyridines 3e, g.
- O'Murchu, C.
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p. 880 - 882
(2007/10/02)
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- REINVESTIGATION OF THE REACTION OF NICOTINIC ACID 1-OXIDE WITH ACETIC ANHYDRIDE
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Reinvestigation of the reaction of nicotinic acid 1-oxide (1) with boiling acetic anhydride has revealed that the primary product is not 2-acetylnicotinic acid 1-oxide (3) but 3-acetoxy-4-aza-3-methyl-1(3H)-isobenzofuranone 4-oxide (2), the acetate of the ring tautomer of 3.Reactions of 2 and 3 with phosphorus trichloride and some related reactions are reported.
- Nagano, Hiroyuki,Hamana, Masatomo,Nawata, Yoshiharu,Prachayasittikul, Supaluk,Abdel-Sayed, Ashraf N.,Bauer, Ludwig
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p. 1263 - 1270
(2007/10/02)
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