F 33 Features of the reaction of 3(5)-methyl-5(3)-trifluoromethylpyrazole with chloroform. Synthesis and structure of fluorinated analogs of tris(pyrazol-1-yl)methane / N. S. Boltacheva, P. A. Slepukhin, M. G. Pervova, M. A. Samorukova, L. G. Lavrenova, V. I. Filyakova, V. N. Charushin // Russian Journal of General Chemistry. - 2012. - Vol.82, №8. - С. 1444-1450 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): CHLOROFORM -- TRIFLUOROMETHYLPYRAZOLE -- TRIS(PYRAZOL-1-YL)METHANE Аннотация: Reaction of 3(5)-methyl-5(3)-trifluoromethylpyrazole (I) with chloroform leads to a complex mixture of compounds. The main components are {bis[(5-methyl-3-trifluoromethyl)pyrazol-1-yl](3-methyl-5-trifluoromethyl)pyrazol-1-yl}methane, bis{[(3-methyl-5-trifluoromethyl)pyrazol-1-yl](5-methyl-3-trifluoromethyl)-pyrazol-1-yl}methane, and tris[(3-methyl-5-trifluoro-methyl)pyrazol-1-yl]methane. The structure of isomeric substances was proved by XRD method \\\\Expert2\\nbo\\Russian Journal of General Chemistry\\2012, V. 82, N 8, p. 1444–1450.pdf |
C 98 Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 15. Isomerization of thiazolo[4,5-b]quinoxalines in the presence of acids [Electronic resource] / V. N. Charushin, V. G. Baklykov, O. N. Chupakhin, V. N. Drozd // Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 3. - С. 331-338. - Bibliogr. : p. 337-338 (21 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ISOMERIZATION -- CHLOROFORM -- QUINOXALINIUM CATION Аннотация: 4-Alkyl-2-phenyl-3a,4,9,9a-tetrahydrothiazolo[4,5-b]quinoxalines undergo isomerization in chloroform in the presence of acids to the regioisomeric (with respect to them) 9-alkyl-substituted derivatives. Under the same conditions 2,4-dimethyl-3a,4-9,9a-tetrahydrothiazolo [4,5-b]quinoxaline undergoes isomerization to 4-methyl-1H-2,3,3a,4,9,9a-hexahydropyrrolo[2,3-b]quinoxaline-2-thione. It was demonstrated by means of deuterium labels that in both cases the isomerization proceeds through a step involving dissociation to a quinoxalinium cation and the corresponding thioamide \\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1985, v.21, N 3, p. 331.pdf |