Cyclic derivatives of 3-fluoro-3,3-dinitro-1-aminopropane

Conclusions A study was made of the preparation and nitrolysis of some cylic derivatives of 3-fluoro-3, 3-dinitro1-aminopropane, and the differences in the reactivity of the latter compound and the behavior of 3,3,3-trinitro-1-aminopropane in the same reactions were pointed out.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1369–1371, June, 1973.     

Mass spectrometry of oleanolic acid glycosides

Conclusions An analysis of the mass spectra of the oleanolic acid glycosides makes it possible to determine the nature of the carbohydrate moieties and the site of their attachment to the genin, and also to reliably identify the nature of the genin.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2713–2718, December, 1973.     

Mechanochemical reactions in Co<Subscript>80</Subscript>B<Subscript>20</Subscript> and Co<Subscript>60</Subscript>B<Subscript>40</Subscript> mixtures during ball milling and postannealing

The solid-phase interaction of cobalt with boron during high-energy ball milling of Co₈₀B₂₀ and Co₆₀B₄₀ mixtures was studied. It was found that Co₃B boride forms during the mechanical alloying of components in the presence of both modifications of Co with a reduction in the size of blocks of up to 7–15 nm. The transformation of the metastable Co₃B phase into stable Co₂B and CoB borides is observed in the temperature range of 590–700°C.     

Synthesis of macrolide antibiotics. 15. Stereodirected synthesis of erythronolide B according to the coupling scheme of the (C9-C13) + (C7-C8) + (C1-C6) fragments

Conclusions A stereodirected synthesis of erythronolide B from levoglucosane by coupling the C⁹-C¹³) + (C⁷-C⁸) + (C¹-C⁶) fragments was carried out.For previous communication, see [1],Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 447–451, February, 1989.     

Free-radical reactions of carbohydrate derivatives in the synthesis of carbocyclic compounds

The decisive influence of the carboxyl group on the methanolysis of 3-methoxy-4-methoxycarbonylmethyl-2-oxabicyclo[2.2.1.]heptanes was proved experimentally, and several routes of conversion of the latter to the corresponding cyclopentanes were found.For Communication 1 see Ref. ¹ This work was partially supported by the Russian Foundation for Fundamental Research.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1989–1991, November, 1993.     

Synthesis of macrocyclic antibiotics. 10. Synthesis of the C9−C13 fragment of neomethinolide

Conclusions The C⁹–C¹³ fragment of neomethinolide has been synthesized from D-xylose.For communication 9, see [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2571–2575, November, 1986.     

Synthesis of macrolide antibiotics. 18. Stereospecific building up of the carbon chain of erythronolide B

Conclusions A stereodirected synthesis of erythronolide B carbon chain was carried out starting from from levoglucosan.For previous communication, see [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 688–693, March, 1989.     

Reactions of 1-(3,4-diethoxybenzylidene)-6,7-diethoxy-1,2,3,4-tetrahydroisoquinoline with polyfluorocarbonyl compounds

Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1689, December, 1990.