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Документ 1,8-Bis(9'-carbazolyl)-3,6-dioxaoctane: Synthesis and Structure(Ekskluziv Publ., 2015) Shtamburg, V. G.; Shtamburg, V. V.; Zubatyuk, R. I.; Kravchenko, S. V.; Klotz, E. A.; Distanov, V. B.; Uspensky, B. V.Документ 1-Alkoxyamino-4-dimethylaminopyridinium derivatives as new representatives of O–N–N⁺ geminal systems and their structure(Elsevier Inc., 2012) Shtamburg, V. G.; Tsygankov, A. V.; Shishkin, O. V.; Zubatyuk, R. I.; Shtamburg, V. V.; Gerasimenko, M. V.; Mazepa, A. V.; Kostyanovsky, R. G.Документ Synthesis and structure of N-alkoxyhydrazines and N-alkoxy-N',N',N'-trialkylhydrazinium salts(Elsevier Inc., 2013) Shtamburg, V. G.; Shishkin, O. V.; Zubatyuk, R. I.; Shtamburg, V. V.; Tsygankov, A. V.; Mazepa, A. V.; Kadorkina, G. K.; Kostyanovsky, R. G.New types of 1,1,1-trialkyl-2-alkoxyhydrazinium chlorides and N-alkoxyhydrazines were obtained by reactions of N-chloro-N-alkoxyureas with trimethylamine or 1,4-diaza[2.2.2]bicyclooctane and by reactions of methyl N chloro-N-methoxycarbamate with potassium salt of N-acetylbenzenesulfonylamide. The XRD studies of N,N' bis(methoxycarbonyl)-N,N'-dimethoxyhydrazine, N'-methoxy-N'‑methoxycarbonyl-N-acetylbenzenesulfonylhydrazide and 1,1,1-trimethyl-2-methoxyhydrazinium perchlorate revealed the pyramidal configuration of the central nitrogen atoms in O–N–N geminal system, unusual elongation of N–N+ bond and shortening of N–OMe bond in 1,1,1-trimethyl-2-methoxyhydrazinium perchlorate.Документ The properties and structure of N-chloro-N-methoxy-4-nitrobenzamide(Elsevier Inc., 2012) Shtamburg, V. G.; Tsygankov, A. V.; Shishkin, O. V.; Zubatyuk, R. I.; Uspensky, B. V.; Shtamburg, V. V.; Mazepa, A. V.; Kostyanovsky, R. G.The XRD study of N-chloro-N-methoxy-4-nitrobenzamide revealed the high pyramidality degree of its amide nitrogen atom in O–N–Cl moiety. N-Chloro-N-methoxy-4-nitrobenzamide reacts with AcONa in MeCN selectively forming N-acetoxy-N-methoxy-4-nitrobenzamide, whereas its methanolysis in the presence of AcONa yields N,N' bis(4-nitrobenzoyl)-N,N'-dimethoxyhydrazine.Документ Synthesis, structure and properties of N-alkoxy-N-(1-pyridinium)urea salts, N-alkoxy-N-acyloxyureas and N,N-dialkoxyureas(Elsevier Inc., 2007) Shtamburg, V. G.; Shishkin, O. V.; Zubatyuk, R. I.; Kravchenko, S. V.; Tsygankov, A. V.; Shtamburg, V. V.; Distanov, V. B.; Kostyanovsky, R. G.N-Alkoxy-N-(1-pyridinium)urea salts 3, 4 have been prepared, the conversions of N-acetoxy-N-methoxyurea 7 into N,N-dimethoxyurea 8 and of N-n-propyloxy-N-(1-pyridinium)-N',N'-dimethylurea chloride 6 into N,N dimethoxy-N',N'-dimethylurea 11 were carried out. A high pyramidality of the amide nitrogen in O–N–X groups [X = N+C5H5, OMe, OC(O)C6H4Cl-p] has been revealed by XRD studies of ureas 3b, 8 and N-p chlorobenzoyloxy-N-n-butyloxyurea 9.Документ Geminal systems 64.*N-Alkoxy-N-chloroureas and N,N-dialkoxyureas(Springer and Business Media, Inc., 2015) Shtamburg, V. G.; Kostyanovsky, R. G.; Tsygankov, A. V.; Shtamburg, V. V.; Shishkin, O. V.; Zubatyuk, R. I.; Mazepa, A. V.; Kravchenko, S. V.Molecular and crystal structures of N-alkoxy-N-chloroureas and N,N-dialkoxyureas were studied together with those of N-alkoxyureas as reference compounds. N-Alkoxy-N-chloroureas were found to have an elongated N—Cl bond and a shortened N—O(Alk) bond due to the nO(Alk)*N—Cl anomeric effect. Alcoholysis of N-alkoxy-N-chloro derivatives of urea, N´-arylureas, and carbamates in the presence of silver trifluoroacetate leads to sterically hindered N,N-dialkoxyureas, N,N-dialkoxy-N´-arylureas, and N,N-dialkoxycarbamates, respectively.Документ Synthesis and structure of new N-alkoxy-N-(1-pyridinium)urea chlorides(Deuton-X Ltd., 2016) Shtamburg, V. G.; Shtamburg, V. V.; Tsygankov, A. V.; Anishchenko, A. A.; Zubatyuk, R. I.; Shishkina, S. V.; Mazepa, A. V.; Klots, E. A.New N-[1-(4-amino)pyridinium]-N-methoxyurea chloride, N-[1-(2-amino)pyridinium]-N-methoxyurea chloride and their analogs were synthesized by N-alkoxy-N-chloroureas reaction with the proper pyridines in acetonitrile or ether solution by improved procedure. XRD study of N-[1-(4-amino)pyridinium]-N-methoxyurea and N-[1-(2 amino)pyridinium]-N-methoxyurea revealed the elongation of N-N+ bonds and some shortening of MeO-N bonds, qunonoid deformation of pyridine rings compare to it unsubstituted analog. The substantial pyramidality of central nitrogen atom in O-N-N+ moiety and N-C carbamoyl bonds difference were established too. The structure summary of N-alkoxy-N-(1-pyridinium)ureas salts and other derivatives of 1-(N-alkoxyamino)pyridinium salts has been done.Документ Alcoholysis of N-acetoxy-N-alkoxycarbamates. Synthesis of NH-N,N-dialkoxyamines from N,N-dialkoxycarbamates(Deuton-X Ltd., 2014) Shtamburg, V. G.; Anishchenko, A. A.; Shtamburg, V. V.; Tsygankov, A. V.; Kostyanovsky, R. G.The alcoholysis of N-acetoxy-N-alkoxycarbamates by methanol or ethanol at 20 – 40 °C yields N,N-dialkoxycarbamates and acetic acid. At the lower temperature the competitive formation of N,N’-bis(alkoxycarbonyl)-N,N’-bis(alkoxy)hydrazines can occur. The alkaline hydrolysis of N,N-dialkoxycarbamates yields NH-N,N-dialkoxyamines.Документ Methanolysis of N-acetoxy-N-n-propyloxy-N’,N’-dimethylurea in different conditions(Deuton-X Ltd., 2014) Shtamburg, V. G.; Tsygankov, A. V.; Shtamburg, V. V.; Anishchenko, A. A.; Mazepa, A. V.; Kostyanovsky, R. G.The methanolysis of N-acetoxy-N-n-propyloxy-N’,N’-dimethylurea in the presence of strong acids at room temperatures or in the boiling methanol yields N,N-dimethoxy-N’,N’-dimethylurea as final product. Primarily the nucleophilic substitution acetoxy group at nitrogen on methoxy group arises. At second stage the transesterification of N,N-dialkoxyamino group of formed N-methoxy-N-n-propyloxy-N’,N’-dimethylurea take place.Документ 1-(N-Alkoxyamino)pyridine Derivatives and others N-Alkoxyhydrazines(Ekskluziv Publ., 2015) Shtamburg, V. G.; Tsyhankov, A. V.; Shtamburg, V. V.; Klotz, E. A.; Shishkina, S. V.; Zubatyuk, R. I.; Mazepa, A. V.