Synthesis of α-functional nitro compounds by the nitration of activated carbonyl compounds in a two-phase system

2-Nitro-1,3-dicarbonyl and -nitromonocarbonyl compounds were synthesized in the yields varying from moderate (30 %) to nearly quantitative by the nitration of -dicarbonyl compounds in a two-phase system: sulfuric/nitric acid mixture-chloroform at - 10÷10 °C. The use of phase transfer conditions made it possible to avoid the formation of furoxans as by-products and to simplify the isolation of products. This method is quite common for preparing various -functional nitro compounds including those containing a CF₃-group. Key words: nitration, -functional nitro compounds.Translated fromIzvestiya Akademn Nauk. Seriya Khimicheskaya, No. 1, pp. 76–79, January, 1994.     

A chemical investigation ofMatteuccia struthiopteris

Irkutsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 608–609, July–August, 1993.     

Structure of Tetranuclear Iron(III) d- and dl-Tartrates in Aqueous Solutions

The geometric parameters of dl- and d-tetranuclear iron(III) tartrates [Fe₄(d-L)₂(l-L)₂(H₂O)₈]^4–and [Fe₄(d-L)₄(H₂O)₈]^4–(H₄L is tartaric acid) were optimized using the molecular mechanics method (MIND program, Dashevskii–Plyamovatyi model).     

Synthesis of acyclic and macrocyclic analogs of Di-, Tri-, and tetranucleotides

Compounds consisting of two or three uracil fragments were synthesized by reaction of methyl-substituted uracil sodium salts with 1-(6-bromohexyl)-3,6-dimethyluracil or 1,6-dibromohexane. Treatment of these compounds with paraformaldehyde gave the corresponding pyrimidinophanes and acyclic compounds in which the uracil fragments are linked through methylene bridges. Uracil derivatives having no substituent on N³ were synthesized by reactions of silylated uracils with 1,3-bis(6-bromohexyl)uracil or 4,4′-(6-bromohexyloxy)diphenylmethane. The acyclic compound was converted into pyrimidinophane containing uracil fragments with N³H groups. A trinucleotide analog including uracil and two adenine fragments was synthesized from 1,3-bis(6-bromohexyl)uracil.     

Nitroylides

Conclusions On interacting iodonium dinitromethylides with aromatic hydrocarbons of the benzene series the corresponding aryldinitromethanes were formed, i.e., the product of introducing the carbanion portion of the ylide at the C-H bond of the aromatic ring. The influence of temperature and added salts of transition metals on the yileld of reaction products has been clarified.Translated from Izvestiya Akademii Nauk SSSR, No. 12, pp. 2741–2746, December, 1982.