R 35 Regioselective solvent-sensitive reactions of 6-(trifluoromethyl)comanic acid and its derivatives with phenylhydrazine [Text] / B. I. Usachev, D. L. Obydennov, M. I. Kodess, V. Ya. Sosnovskikh // Tetrahedron Letters. - 2009. - Vol. 50, № 31. - P4446-4448 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: 6-(Trifluoromethyl)comanic acid reacts regioselectively with phenylhydrazine in water to give 5-[3,3,3-trifluoro-2-(phenylhydrazono)propyl]-1-phenyl-1H-pyrazole-3-carboxylic acid. Similar reaction in dioxane leads to 3-[3,3,3-trifluoro-2-(phenylhydrazono)propyl]-1-phenyl-1H-pyrazole-5-carboxylic acid. A strong solvent influence on the reaction route was also found for 6-(trifluoromethyl)comanic acid derivatives \\\\Expert2\\nbo\\Tetrahedron Letters\\2009, v. 50, p.4446.pdf |