Results 1 to 10 of about 9,914 (265)
Results in Chemistry, 2021 An efficient tetra-n-butyl ammonium peroxydisulphate (TBA)2S2O8 catalyzed a direct one-pot synthesis of fully substituted pyrazoles in excellent yields with high regioselectivity has been described via a three-component cyclocondensation of aldehydes ...
Mallesh Magini +5 more
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1,1,2,2-Tetrakis[(benzoylamino)methyl]hydrazine
Molbank, 2011 We report herein the synthesis of 1,1,2,2-tetrakis[(benzoylamino)methyl]-hydrazine from (benzamidomethyl)triethylammonium chloride and hydrazine monohydrate in the presence of triethylamine in ethanol/aqueous media. The structure of the newly synthesized
Emil Popovski +2 more
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One-pot preparation of carbamoyl benzotriazoles and their applications in the preparation of ureas, hydrazinecarboxamides and carbamic esters [PDF]
Journal of the Serbian Chemical Society, 2016 Carbamoyl benzotriazoles were conveniently synthesized in one-pot from carboxylic acids, diphenylphosphorazidate (DPPA) and benzotriazole (BtH). The reactivity and applications of carbamoyl benzotriazoles were also explored.
Mao Hui +5 more
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Approaches towards the synthesis of 5-aminopyrazoles
Beilstein Journal of Organic Chemistry, 2011 The biological and medicinal properties of 5-aminopyrazoles have prompted enormous research aimed at developing synthetic routes to these heterocyles. This review focuses on the biological properties associated with this system. Various synthetic methods
Ranjana Aggarwal +3 more
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Synthesis of aza-phenylalanine, aza-tyrosine, and aza-tryptophan precursors via hydrazine alkylation; pp. 168–178 [PDF]
Proceedings of the Estonian Academy of Sciences, 2015 Aza-amino acid precursors with an aromatic side chain were synthesized using hydrazine alkylation. This synthetic pathway avoided use of hydrogen gas and expensive hydrogenation catalysts. For the optimization of this alkylation reaction various solvents
Anton Mastitski +3 more
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Hydrolysis and Hydrazinolysis of Isatin-Based Ald- and Ketazines
Journal of Chemistry, 2015 The hydrolysis of isatin aldazine 4a–d afforded the unexpected 3,3′-(hydrazine-1,2-diylidene)bis(indolin-2-one) (5) and 1,2-di(arylidene)hydrazines 6a–d through dual hydrolysis of 4a–d. A mechanism to explain the formation of 5 and 6a–d was proposed. In
Hany S. Ibrahim +2 more
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Synthese und Eigenschaften eines neuen heterozyklischen Systems, des Imidazo[2.1-c]-as-triazins
CHIMIA, 1969 By ring fission of 2-amino-3-phenacyl-oxazoliumhalogenides with hydrazines produces in a fast reaction the new system of 1.4-dihydroimidazo[2.1-c]-as-triazines. The reactivity and characteristic fluorescence properties of these compounds are described.
A. Hetzheim, H. Pusch
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Potassium iodide catalysis in the alkylation of protected hydrazines; pp. 10–17 [PDF]
Proceedings of the Estonian Academy of Sciences, 2016 Potassium iodide catalysis was applied for the synthesis of protected benzylhydrazines and hydrazinoacetic acid esters by the alkylation of protected hydrazines. Benzylic halogenides and halogenoacetic acid esters were employed as alkylating agents.
Anton Mastitski +3 more
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Synthesis and Free Radical Scavenging Activity of New Hydroxybenzylidene Hydrazines
Molecules, 2017 Hydroxybenzylidene hydrazines exhibit a wide spectrum of biological activities. Here, we report synthesis and free radical scavenging activity of nine new N-(hydroxybenzylidene)-N′-[2,6-dinitro-4-(trifluoromethyl)]phenylhydrazines.
Frantisek Sersen +6 more
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Synthesis of Mesoionic 1,3,4-Thiadiazole-2-Thiolates
MolbankA reliable synthesis of C5-unsubstituted 1,3,4-thiadiazole-2-thiolates is described that avoids potentially explosive or laborious steps. This work presents a reliable method for preparing the starting material dithioformate from carbon disulfide and ...
Sean Ray Kahnert, Andreas Schmidt
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