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排序方式: 共有113条查询结果,搜索用时 31 毫秒
1.
I. B. Rozentsveig Yu. A. Aizina K. A. Chernyshev L. V. Klyba E. R. Zhanchipova E. N. Sukhomazova L. B. Krivdin G. G. Levkovskaya 《Russian Journal of General Chemistry》2007,77(5):926-931
The mixtures of mono-and dihalothiophenesulfonyl chlorides, formed in the sulfochlorination reaction of 2,5-dichlorothiophene
and 2,5-dibromothiophene, were treated with aqueous ammonia and thus converted into mixtures of the corresponding stable thiophenesulfonamides.
The structure and composition of the latter were studied by physicochemical methods: GC-MS and 1H, 13C, 1H-13C HSQC, 1H-13C HMBC, and NOESY NMR spectroscopy. As a result of the above chemical transformations, 2,5-dichlorothiophene afforded a mixture
of 5-chlorothiophene-2-sulfonamide and 4,5-dichlorothiophene-3-sulfonamide in a roughly 70:30 ratio. In the case of 2,5-dibromothiophene,
a mixture of 5-bromothiophene-2-sulfonamide, 4,5-dibromothiophene-3-sulfonamide, and 3,5-dibromothiophene-2-sulfonamide (3:54:43)
was formed.
Original Russian Text I.B. Rozentsveig, Yu.A. Aizina, K.A. Chernyshev, L.V. Klyba, E.R. Zhanchipova, E.N. Sukhomazova, L.B.
Krivdin, G.G. Levkovskaya, 2007, published in Zhurnal Obshchei Khimii, 2007, Vol. 77, No. 5, pp. 831–836. 相似文献
2.
L. G. Shagun L. V. Klyba I. A. Dorofeev E. R. Zhanchipova I. A. Mikhailova M. G. Voronkov 《Chemistry of Heterocyclic Compounds》2007,43(2):166-168
2,5-Dimercapto-2,5-dimethyltetrahyrothiophene was synthesized by the reaction of 1-iodopropan-2-one with hydrogen sulfide
in an ether solution of hydrogen chloride at-70°C. Its structure was established by mass spectrometry, 1H and 13C NMR spectroscopy.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, 216–219, February, 2007. 相似文献
3.
M. G. Voronkov O. M. Trofimova Yu. I. Bolgova L. V. Klyba L. I. Larina A. I. Albanov V. A. Pestunovich N. F. Chernov K. B. Petrushenko 《Chemistry of Heterocyclic Compounds》2003,39(12):1639-1644
We have synthesized 1- and 2-(trimethylsilylmethyl)- and 1- and 2-(trimethoxysilylmethyl)benzotriazoles by reaction of 1,2,3-benzotriazolylsodium with trimethyl- or trimethoxy(chloromethyl)silane. We obtained 1- and 2-(silatranylmethyl)benzotriazoles by transesterification of the latter with triethanolamine. 相似文献
4.
Voronkov M. G. Pestunovich A. E. Albanov A. I. Klyba L. V. Pestunovich V. A. 《Russian Journal of Organic Chemistry》2003,39(10):1507-1510
Previously unknown 3,3-dimethyl-2,3,5,6-tetrahydroimidazo[2,1-b][1,3,4]thiazasilole and its zwitterionic derivatives containing five-coordinate silicon atom, namely 7-substituted 3,3-dimethyl-2,3,5,6-tetrahydroimidazo[2,1-b][1,3,4]thiazasilol-4-ium chlorides, have been synthesized by reaction of 1,3-bis(trimethylsilyl)tetrahydroimidazole-2-thione with chloro(chloromethyl)dimethylsilane and subsequent transformations of the products. 相似文献
5.
L. V. Klyba N. A. Nedolya N. I. Shlyakhtina E. R. Zhanchipova 《Russian Journal of Organic Chemistry》2005,41(10):1544-1550
Previously unknown 5-(1-ethoxyethoxy)-2-methoxy-6-methylsulfanyl-2,3-dihydropyridine, 3-(1-ethoxyethoxy)-2-methylsulfanylpyridine, and 2-methylsulfanylpyridin-3-ol were synthesized from α-lithiated 1-(1-ethoxyethoxy)allene, methoxymethyl isothiocyanate, and methyl iodide, and their fragmentation under electron impact was studied. At ionizing electron energies of 12 and 60 eV in the temperature range from 50 to 250°C, the molecular ions derived from 5-(1-ethoxyethoxy)-2-methoxy-6-methylsulfanyl-2,3-dihydropyridine and 3-(1-ethoxyethoxy)-2-methylsulfanylpyridine decompose along two main pathways: rupture of the C-O bond in the acetal moiety to give oxonium ions with m/z 73 (in the two cases) and 168 (pyridine derivative) and unexpectedly facile McLafferty rearrangement with elimination of ethoxyethene molecule to produce fragment ions with m/z 173 and 141, respectively. The latter pathway was not observed previously for dihydropyridines and acetals, and it predominates in the fragmentation of 3-(1-ethoxyethoxy)-2-methylsulfanylpyridine. Expulsion of methanol molecule from the molecular ion of 5-(1-ethoxyethoxy)-2-methoxy-6- methylsulfanyl-2,3-dihydropyridine occurred only above 170°C. 相似文献
6.
S. V. Basenko I. A. Gebel M. G. Voronkov L. V. Klyba R. G. Mirskov 《Russian Chemical Bulletin》1998,47(8):1571-1573
Methyl(vinyl)dichlorosilane reacts with DMSO in the presence of hexamethyldisiloxane to give the corresponding linear oligosiloxanes
of the general formula Me3Si(OSiMeVin)
n
OSiMe3 (n=1–6) as well as MeSi(OSiMe3)3 and Me3Si(MeOSiVin)
m
OSi(OSiMe3)(Me)OSiMe3 (m=1–2). The same reaction in the presence of chlorotrimethylsilane results in oligomers of the general formula Me3Si(OSiMeVin)
n
Cl (n=1–3). A possible scheme of their formation is discussed.
Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 8, pp. 1614–1616, August, 1998. 相似文献
7.
8.
9.
E. P. Levanova V. A. Grabel’nykh V. S. Vakhrina N. V. Russavskaya A. I. Albanov L. V. Klyba O. A. Tarasova I. B. Rozentsveig N. A. Korchevin 《Russian Journal of General Chemistry》2013,83(9):1660-1665
Dimethyldiselenide reacts with 2,3-dichloro-1-propene at 20–25°C in the hydrazine hydrate-KOH medium to form 2-chloro-3-methylselanyl-1-propene with 90% yield. Diphenyldiselenide in the reaction with 2,3-dichloro-1-propene, depending on the conditions, can give quite selectively four products: 2-chloro-3-phenylselanyl-1-propene, phenylselanylpropadiene, 1-phenylselanyl-1-propyne, and Z-1,2-bis(phenylselanyl)-1-propene. The effect of the selenium atom on the reaction direction and the products structure is discussed. 相似文献
10.
E. P. Levanova V. A. Grabel’nykh A. V. Elaev N. V. Russavskaya L. V. Klyba A. I. Albanov N. A. Korchevin 《Chemistry of Heterocyclic Compounds》2012,47(11):1345-1352
The saturated heterocyclic compounds C4H8Y, C5H10Y, and C5H10Y2 (Y = Se or Te) have been prepared by the reaction of 1,4-dibromobutane or 1,5-dibromopentane with potassium chalcogenides.
The novelty of the route consists of the use of the hydrazine hydrate–KOH system for the reductive generation of potassium
selenide, telluride, diselenide or ditelluride from elemental chalcogens. 相似文献