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V. A. Reznikov L. A. Vishnivetskaya L. B. Volodarskii 《Russian Chemical Bulletin》1993,42(9):1547-1551
Reactions of metallated 1-hydroxy-2,2,4,5,5-pentamethyl-3-imidazoline with electrophilic reagents followed by oxidation result in mono- and bifunctional substituted nitroxides of 3-imidazoline and an imidazolidine series including enaminocarbonyl and -thiocarbonyi derivatives and enaminoimines, the spin-labeled chelating reagents.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1612–1616, September, 1993. 相似文献
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The reactions of the dianion generated from 1-hydroxy-2,2,4,5,5-pentamethyl-2,5-dihydro-1H-imidazole under the action of lithium diisopropylamide with nitroxyl radicals derived from 2,5-dihydro-1H-imidazole or 2,5-dihydro-1H-imidazole 3-oxide and containing the ester, aldehydo, cyano, or imino groups afforded biradicals, including those containing the enamino ketone and enamino imine functions. The reactions of this dianion with nitriles derived from 2,5-dihydro-1H-imidazole 3-oxide gave rise to an enamino nitrile, i.e., electrophilic cyanation formally occurred. 相似文献
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Conclusions The oxidation of N-(4-hydroxyimino-2-methyl-2-pentyl)-N-isopropylhydroxylamine gives 1-hydroxy-2,2, 4,6,6-pentamethyl-l,2,5,6-tetrahydropyrimidine 3-oxide, from which was generated the nitroxyl radical, namely 2,2,4,6,6-pentamethyl-1,2,5,6-tetrahydropyrimidine-1-oxyl 3-oxide.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2619–2622, November, 1977. 相似文献
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The protonation of 1-R-2,2,5,5-tetramethyl-3-imidazoline-3-oxides (R=OH, O) in superacid media was investigated with1H and13C NMR. The hydroxylamino dication forming on protonation can undergo imidazoline ring opening to form an isomeric mixture of diprotonated N-(2-hydroxyimino-1,1-dimethylethyl),,-dimethylnitrones.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2755–2761, December, 1991. 相似文献
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G. I. Shchukin I. A. Grigor'ev L. A. Vishnivetskaya L. B. Volodarskii 《Russian Chemical Bulletin》1988,37(8):1743-1743
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, p. 1944, August, 1988. 相似文献
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T. A. Berezina V. A. Reznikov L. B. Volodarsky I. Yu. Bagryanskaya Yu. V. Gatilov 《Russian Chemical Bulletin》2000,49(1):116-121
The reactions of heterocyclic paramagnetic aldonitrone,viz., 2,2,5,5-tetramethyl-3-imidazoline-1-oxyl 3-oxide, with mono- and disubstituted alkynes afford unstable isoxazoline derivatives.
The reactions with monosubstituted alkynes yield predominantly 5-substituted regioisomers. The resulting isoxazoline derivatives
are readily (and often spontaneously) converted into enaminoketones,viz, imidazolidine-1-oxyl derivatives. In the presence of tolan, the title paramagnetic aldonitrone gives a dimer in which one
imidazoline ring undergoes profound transformation. The structure of the resulting dimer was established by X-ray diffraction
analysis.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 112–117, January, 2000. 相似文献
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T. A. Berezina V. A. Reznikov L. B. Volodarsky I. Yu. Bagryanskaya Yu. V. Gatilov 《Russian Chemical Bulletin》1990,49(1):116-121
The reactions of heterocyclic paramagnetic aldonitrone,viz., 2,2,5,5-tetramethyl-3-imidazoline-1-oxyl 3-oxide, with mono- and disubstituted alkynes afford unstable isoxazoline derivatives.
The reactions with monosubstituted alkynes yield predominantly 5-substituted regioisomers. The resulting isoxazoline derivatives
are readily (and often spontaneously) converted into enaminoketones,viz, imidazolidine-1-oxyl derivatives. In the presence of tolan, the title paramagnetic aldonitrone gives a dimer in which one
imidazoline ring undergoes profound transformation. The structure of the resulting dimer was established by X-ray diffraction
analysis.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 112–117, January, 2000. 相似文献
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Method for the synthesis of m-and p-isomers of 4-[2-(ethynylphenyl)vinyl]-2,2,5,5-tetramethyl-3-imidazoline-1-oxyl 3-oxides by the cross-coupling of 4-[2-(3-iodophenyl)vinyl]-and
4-[2-(4-iodophenyl)vinyl]-2,2,5,5-tetramethyl-3-imidazoline-1-oxyl 3-oxides with (trimethylsilyl)acetylene followed by desilylation
was elaborated. The reactions at the CH-fragment of the ethynyl group were performed. The Mannich reaction proceeds with the
loss of a spin label, whereas the oxidative homocoupling, with its retention.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2051–2054, October, 2007. 相似文献
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Conclusions The reaction of 2,2,5,5-tetramethyl-3-imidazoline-1-oxyl-4-carboxamide with sodium hypobromite leads to 4-amino-2,2,5,5-tetramethyl-3-imidazoline-1-oxyl. 2,2,5,5-Tetramethyl-3-imidazoline-3-oxide-1-oxyl-4-carboxamide under the same conditions gives 3-hydroxy-2,2,5,5-tetramethylimidazolidin-4-one-1-oxyl.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 228–231, January, 1979. 相似文献
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V. A. Reznikov V. V. Martin L. B. Volodarskii 《Chemistry of Heterocyclic Compounds》1990,26(9):997-1000
Reaction of -hydroximino--oxo-3-imidazoline and 3-imidazoline-3-oxide derivatives with hydroxylamine results in recyclization leading to the formation of pyrroline derivatives, namely dioxines or nitrosooximes. Oxidation of dioximinopyrroline gives a pyrrolofuroxane.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1195–1198, September, 1990. 相似文献
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The course of the heterogeneous reaction of 1-hydroxy-5,5-dimethyl-2,4-diphenyl-3-imidazoline 3-oxide with PhLi is dependent on the conditions of the formation of the crystalline phase of the starting compound. This compound can be isolated mainly in the cyclic or in the chain tautomeric forms.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1175–1176, June, 1995. 相似文献
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1-Hydroxy-2-oxo-3-phenyl-1,2-dihydroquinoxaline 4-oxide under conditions of the Mitsunobu reaction reacts with alcohols giving
the corresponding esters at the hydroxy group in position 1. Other representatives of hydroxamic acids such as 1,4-dihydroxyperhydroquinoxaline-2,3-dione
and 1,4-dihydroxy-3,3,6,6-tetramethylpiperazine-2,5-dione undergo destruction under these conditions.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1240–1243, June, 2008. 相似文献
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2-(Arylylethynylphenyl)-4,4,5,5-tetramethyl-2-imidazoline-1-oxyl 3-oxides 12 and 13 were synthesized by cross-coupling of aryl iodides with 1-alkynes containing the 4,4,5,5-tetramethyl-2-imidazoline-1-oxyl 3-oxide fragment. A procedure was developed for the preparation of 3- and 4-ethynylbenzaldehydes with the use of 2-methylbut-3-yn-2-ol. 相似文献