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821.265  Articles
1 of 82.127 pages  |  10  records  |  more records»
Conclusions. It has been found that the reactions of 1,3-diaryl substituted pyrazole-4-carbaldehydes with 3-methyl-5-aminopyrazole and 2,2-dimethyl-1,3-dioxane-4,6-dione are regioselective and lead to the formation of pyrazolo[3,4-b]pyridone systems. This... see more

Previously designated a comfortable and effective scheme of 3,7-disubstituted [1,2,4]triazolo[4,3-a]pyrazin-8(7H)-ones synthesis was spread to derivatives of ?-(7-aryl-8-oxo-7,8-dihydro[1,2,4]triazolo[4,3-a]pyrazin-3-yl) alkylcarboxylic acids. Our approac... see more

Previously designated a comfortable and effective scheme of 3,7-disubstituted [1,2,4]triazolo[4,3-a]pyrazin-8(7H)-ones synthesis was spread to derivatives of ?-(7-aryl-8-oxo-7,8-dihydro[1,2,4]triazolo[4,3-a]pyrazin-3-yl) alkylcarboxylic acids. Our approac... see more

Kinetics of the alkaline hydrolysis reaction of methyl esters of substituted 4,5-dimethoxy-N-phenylanthranilic acids has been studied in the binary solvent of dioxane-water at 55, 75, 85°C. It has been found that at each experimental temperatures lgkT dep... see more

The paper is devoted to preparation and study of the transformations of novel multifunctional fluorinated synthetic building blocks – alkyl N-(3-nitro-1,1,1-trifluoropropan-2-yl) carbamates. In order to obtain them in high yields the aza-Henry reaction of... see more

Arylmethyliden derivatives of 2,2-dimethyl-1,3-dioxane-4,6-dione; Meldrum`s acid; 6,7-dihydro-7-aryltetrazolo [1,5-a]pyrimidin-5(4H)-ones; synthesis; pharmacological activityCyclocondensations of 1H-tetrazol-5-amine with methylcinnamates, arylmethyliden m... see more

The alternative pathways of intramolecular cyclization for oligomeric product of epichlorohydrin aminolysis by dimethylamine have been investigated at ab initio level of theory. The localized transition states geometry indicates a concerted mechanism of n... see more

Ten organic solvents (triethanolamine, diethanolamine, ethylene gly­col, methyl ethyl ketone, n-hexane, triethylamine, ethylene glycol dimethyl ether, glycerol, tetrahydrofuran and dioxane) were applied as cosolvents in the CaO-catalyzed ethanolysis of su... see more

La compagnie canadienne 4D Art surprend le regard du public et interroge les sens de réalité et présence, par l’interaction scénique de corps réels et virtuels en mouvement. Pour comprendre le processus créateur des spectacles de 4D Art, on présente un en... see more

1 of 82.127 pages  |  10  records  |  more records»