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1.
A. V. Shastin O. A. Rakitin T. I. Godovikova Yu. A. Strelenko F. I. Dubovitskii L. I. Khmel'nitskii 《Russian Chemical Bulletin》1988,37(6):1282-1282
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1447–1448, June, 1988. 相似文献
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The treatment of octafluorocyclopentene with organolithium reagents gave the corresponding symmetrical disubstituted perfluorocyclopentenes in good to high yields. The reaction with Grignard reagents led to the monosubstituted perfluorocyclopentenes, which were subjected to the further nucleophilic substitution reaction using another Grignard or aryllithium reagents, unsymmetrical disubstituted perfluorocyclopentenes being obtained in high yields. 相似文献
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Puhui Li 《Tetrahedron letters》2010,51(15):2032-8234
A diverse array of nitrosoalkenes derived from both acyclic and cyclic ketones, as well as aldehydes, via the Denmark protocol using α-chloro-O-TBS-oximes can be trapped efficiently in situ by a wide variety of potassium ester enolates to afford conjugate addition products in good yields. 相似文献
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Mladen V. Proštenik Miljenko Dumić Nada Bošnjak 《Monatshefte für Chemie / Chemical Monthly》1980,111(3):771-773
Reaction of 1,3-dicarbonyl compounds with nitryl chloride through substitution on the activated methylene group, resulted in the formation of chloro, dichloro and oximino derivatives.
Die Reaktion der 1,3-Dicarbonylverbindungen mit Nitrylchlorid
Zusammenfassung Umsetzung von 1,3-Dicarbonylverbindungen mit Nitrylchlorid ergab die entsprechende Chloro-, Dichloro- und Oximinoderivate in einer Substitutionsreaktion an der aktivierten Methylengruppe.相似文献
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Andrew E. Feiring Michael C. Hovey Samuel D. Arthur 《Journal of fluorine chemistry》1984,24(1):125-132
Perfluoroalkylethylenes react with some carbon-, oxygen-, sulfur-, selenium-, nitrogen-, and phosphorus-based nucleophiles by formal SN2′ displacement of fluoride ion. 相似文献
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Summary The response of a flame ionisation detector (FID) to cyanogen ((CN)2) and cyanogen chloride (CNCI) has been studied. The lower limits of detection for (CN)2 and CNCl were 6×10−12 moles and 2×10−11 moles respectively. In a comparative study a thermal conductivity detector gave as its lower limit of detection for both
(CN)2 and CNCl 4×10−11 moles. Both detectors showed excellent linearity over the range 0 to 10 micromoles. The ratio of the gradients of the FID
calibrations (CN)2/CNCI were found to be approximately two suggesting the response depended on the cyanide group.
The response and stability of the FID was investigated as a function of air and hydrogen flow-rates. The response increased
with increasing air flow-rate for both (CN)2 and CNCI up to 300cm3min−1, thereafter no significant increase was observed.
On raising the hydrogen flow from 10 to 25cm3min−1 only a slight increase in the sensitivity of the FID towards both (CN)2 and CNCI was observed. At higher flow rates the response for (CN)2 increased markedly whereas at the same flow rates the response for CNCI increased only slightly. 相似文献
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The sequential introduction of two carbon nucleophiles on the same alpha-carbon of nitrogen by using selective oxidative cleavage of two silyl groups as electroauxilialies has been accomplished. The combination of this expedient transformation and ring-closing metathesis enables reliable and straightforward syntheses of nitrogen-containing spiro compounds, such as cephalotaxine. 相似文献
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Reactions of N,N-dimethylselenocarbamoyl chloride prepared by using LiAlHSeH with nucleophiles such as lithium alkylselenolate, lithium alkylthiolate, and amines afford the corresponding diselenocarbamates, selenothiocarbamates, and selenoureas. The crystal structure of the Se-phenyl N,N-dimethyldiselenocarbamate was also determined by X-ray diffraction. 相似文献
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U. G. Ibatullin S. A. Vasil'eva Z. Kh. Karimova M. G. Safarov 《Chemistry of Heterocyclic Compounds》1990,26(11):1218-1221
Reaction of 4-methyl-3,4-epoxytetrahydropyran with phenols, thiols, thiocyanic acid and benzoic acid, thiourea, and with sodium sulfite and thiosulfate occurs with opening of the epoxide ring. Using IR spectroscopy it was shown that the products occur via trans-diaxial opening of the oxide ring at the least-substituted carbon atom.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1465–1468, November, 1990. 相似文献
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Palladium catalysts are shown to catalyze the three-component coupling of vinyl halides, trimethylsilyldiazomethane, and stabilized carbon nucleophiles. The reaction is believed to proceed through a palladium-carbene intermediate LX(R)PdCHSiMe 3 that undergoes migration of the vinyl substituent to the electrophilic carbene center to generate an eta 3-allylpalladium intermediate. The allylpalladium intermediate is attacked by the carbon nucleophile to generate a vinylsilane product. 相似文献
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Carbon nucleophiles were used to open a 2,2,3-trisubstituted ethynylaziridine. A cyanide nucleophile opened the ring at the more substituted carbon, proceeding regioselectively with inversion of configuration. In an attempt to expand upon the scope of the reaction, Normant cuprates were reacted with a 2,2,3-trisubstituted ethynylaziridine. This reaction produced chiral allenes via an anti-SN2′ pathway. X-ray analysis of a derivative allowed the absolute stereochemistry of the anti-allenes to be assigned as P. 相似文献
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研究了以CFCl2CF2CF=CF2(1)和CFCl2CF=CFCF2(2)为原料与三氯化铝的反应.结果获得重排产品CCl2=CF2CF2CF3(3).结果支持了从1到3的分子间重排反应的机理.在激烈条件下,3进一步与氯化铝反应得到CCl2=CFCCl2CF3(4),CCl2=CClCCl2CF3(5),CCl2=CClCCl2CClF(6),CCl2=CClCCl2CFCCl2(7)和CCl2=CClCCl2CCl3(8).由分离所得产品的结构可推断化合物3中氟原子被氯原子取代的稳定性按以下次序:CF3->CF=>=-CF2CF=.反应条件对产品得率的影响也被讨论了. 相似文献
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The covalent, surface functionalization of graphene oxide with the malononitrile anion has been demonstrated. Once installed, these surface-bound "molecular lynchpins" can be chemically modified to increase the solubility of the graphene derivative in either organic or aqueous environments. 相似文献
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T. é. Bezmenova T. N. Varshavets A. Ya. Bezmenov 《Chemistry of Heterocyclic Compounds》1974,10(4):406-408
Reaction of 2-sulfolene, 4-hydroxy-2-sulfolene, 4-bromo- and 3-chloro-2-sulfolenes, 3-chloro-4-hydroxysulfolane, and 3,4-dibromo(dichloro)sulfolanes with sodium methane-, hexane-, allene-, benzene-, and p-toluenesulfinates and magnesium gave 3-methyl-, 3-hexyl-, 3-allyl-, 3-phenyl-, and 3-(p-tolylsulfonyl)sulfolanes, 3-methyl-, 3-phenyl-, and 3-(p-tolylsulfonyl)-4-hydroxysulfolanes, and 3-phenyl- and 4-phenylsulfonyl-2-sulfolenes. 相似文献