Resin acids of the oleoresins of conifers growing in Transcarpathia

The chemical composition of the resin acids of the oleoresins of five species of the conifers of Transcarpathia has been studied. The oleoresins contain eight resin acids. ^8,9-Isopimaric and anticopalic acids have been found in the acid part of the oleoresin of the Weymouth pine.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 212–214, March–April, 1987.     

Inadequacy of one-electron approach for investigating antiaromatic molecules and their isomerization reactions

Institute of Catalysis, Siberian Branch, Academy of Sciences of the USSR. Institute of Organic Chemistry, Siberian Branch, Academy of the Sciences of the USSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 5, pp. 30–41, September–October, 1991.     

Quantum chemistry and spectroscopy of highly excited states of coordination compounds

Institute of Inorganic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Institute of Catalysis, Siberian Branch, Academy of Sciences of the USSR. Institute of Chemistry and Chemical Technology, Siberian Branch, Academy of Sciences of the USSR. Branch of the Institute of Chemical Physics, Academy of Sciences of the USSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 29, No. 6, pp. 90–103, November–December, 1988.     

Triterpene glycosides of Thalictrum squarrosum. II. Molecular and crystal structure of squarrofuric acid

The structure of squarrofuric acid (an artifactual genin fromThalictrum squarrosum) has been confirmed by x-ray structural analysis and the configurations of the C13, C14, C17, C20, and C22 asymmetric centers have been established, which has enabled this compound to be assigned to the lanostane series with the following structure: 3,30-dihydroxy-20(S),22(S)-22,25-epoxylanost-9(11)-en-21-oic acid.Novosibirsk Institute of Organic Chemistry, Siberian Branch of the USSR Academy of Science. Irkutsk Institute of Organic Chemistry, Siberian Branch of the USSR Academy of Sciences. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 533–537, July–August, 1987.     

Triterpene glycosides and their genins fromThalictrum foetidum. IV. Structure of cyclofoetigenin B

A glycoside isolated from the epigeal part ofThalictrum foetidum (Ranunculaceae) has yielded a new genin — cyclofoetigenin B — the structure of which has been established on the basis of chemical transformations and spectral characteristics as 24S-cycloartane-3,16,24,25,30-pentaol.Irkutsk Institute of Organic Chemistry of the Siberian Branch of the Academy of Sciences of the USSR. Institute of the Chemistry of Plant Substances of the Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 312–320, May–June, 1986.     

Terpenoids from plants of the family Cupressaceae. I. Sesquiterpene alcohols from the needles ofMicrobiota decussata

The sesquiterpene alcohols 5S,8S-germacra-1E,6E-dien-5-ol, (+)--bisabolol, hedycaryol, and -eudesmol and also the previously undescribed alcohols thujopsan-2-ol (I) and microbiotol. Microbiotol is a tricyclic tertiary alcohol with the empirical formula C₁₅H₂₆O, mp 112–113°C, containing in its molecule four tertiary methyl groups and cyclopropane ring.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostock. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 163–169, March–April, 1981.     

Triterpene saponins fromThalictrum minus. III. The structure of thalicogenin

The periodate oxidation with subsequent alkaline degradation of the products of the oxidation of the predominant saponin isolated fromThalictrum minus has yielded the native genin, which has been called thalicogenin. The structure of thalicogenin as 3,16,22(S),29-tetrahydroxy-9,19-cyclo-20(S)-lanost-24-ene has been established on the basis of chemical transformations and by spectral methods.Irkutsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 207–213, March–April, 1984.     

Structure of a new triterpenoid from the bark of the Siberian larch

A petroleum ether extract of the bark of the Siberian larch has yielded a new triterpenoid — the methyl ester of 3-hydroxy-24S,25R-epoxylanost-9(11)-en-27-oic acid, the structure of which has been established on the basis of spectral characteristics, chemical transformations, and x-ray structural analysis.Institute of Organic Chemistry, Siberian Branch Academy of Sciences of the USSR, Novosibirsk. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 641–645, September–October, 1990.     

Triterpene glycosides and their genins fromThalictrum foetidum. II. The structure of cyclofoetigenin A

A glycoside isolated from the epigeal parts ofThalictrum foetidum (Ranunculaceae) has yielded a new genin — cyclofoetigenin A, the structure of which has been established on the basis of chemical transformations and spectral characteristics as 24S-cycloartane-3,16,25,25-tetraol.Irkutsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 370–375, May–June, 1985.     

Ionic and molecular diffusion and the order-disorder phase transition in the thallium form of natrolite

Institute of Inorganic Chemistry, Academy of Sciences of the USSR, Siberian Branch. Institute of Geology and Geophysics, Academy of Sciences of the USSR, Siberian Branch. Translated from Zhurnal Strukturnoi Khimii, Vol. 31, No. 1, pp. 67–73, January–February, 1990.     

Synthesis and crystal structural study of ternary molybdate NaMg3In(MoO4)5

We have synthesized single crystals of a temary molybdate NaMg₃In(MoO₄)₅ and cam'ed out an X-ray structural study (a KM-4 automatic difiactometer, MoK, radiation, 4503 F, R = 0.047). The triclinic unit cell dimensions are a = 7.0476(7), b = 17.935(2), c = 6.9849(7)Å, = 87.650(9), = 100.980(8), = 92.510(9)°, V= 865.5(2) A³, Z = 2, and space group P^–1. The crystal structure involves MoO₄ tetrahedra and (Mg, In)0₆ octahedra forming a three-dimensional framework with Na atoms located in its cavities. The compound melts at 990°C with decomposition.Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Institute of Physics, Siberian Branch, Russian Academy of Sciences. Buryatian Institute of Natural Sciences, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 34, No. 5, pp. 147–151, September–October, 1993.Translated by T. Yudanova     

Cyclization of some labdane alcohols with a hydroxy group at C-13 by a superacid

On the superacid cyclization of the labdane alcohols manool, isomanool, and sclareol the tetracyclic hydrocarbon (1S,2R,11S,12R,15R)-2,7,7,11,15-pentamethyltetracyclo[10.2.1.0^2,11.0^3,8]pentadec-3(8)-ene with a new carbon skeleton is formed.Institute of Chemistry, Moldavian SSR Academy of Sciences, Kishinev. Novosibirsk Institute of Organic Chemistry, Siberian Branch, USSR Academy of Sciences. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 198–203, March–April, 1988.     

Crystal and molecular structure of the sesquiterpene ketone 9α-hydroxymurola-4-one

Summary The crystal and molecular structure of a ketone (9-hydroxymurola-4-one) synthesized from -cadinol has been investigated. Under the conditions of its production and isolation, the ketone retains the configurations of the asymmetric centers.Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 158–161, March–April, 1979.     

Chemical investigation ofHippopha? rhamnoides. II. Main components of the neutral reaction of the saponification products of an extract of the leaves of the sea buckthorn

The qualitative and quantitative compositions of the neutral fraction of the products of the saponification of a diethyl ether extract of a sea buckthorn leaves have been investigated. Fourteen triterpene compounds and eight aliphatic alcohols have been identified from the results of GLC, CMS, and PMR and also from their melting points.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Institute of Catalysis, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 514–519, July–August, 1985.     

Study of the structure of free radicals in irradiated monocrystals of N-formyl-L-leucine at room temperature

A study was carried out on the structure of the radical formed upon -radiolysis of monocrystals of N-formyl-L-leucine by ESR spectroscopy and quantum chemical calculations. The calculated ESR parameters for the radical conformations, corresponding to an energy minimum, are in best accord with the experimental values.Tbilisi State University and Institute of Chemical Kinetics and Combustion, Siberian Branch, Academy of Sciences of the USSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 30, No. 6, pp. 54–58, November–December, 1989.     

Triterpene glycosides ofThalictrum squarrosum I. Structure of squarrofuric acid

Squarrofuric acid has been isolated fromThalictrum squarrosum by the acid hydryolysis of a methanolic extract. It is suggested that is is an artefact formed on hydrolysis and has the structure of 3, 30-dihydroxy-22,25-epoxylanost-9(11)-en-21-oic acid.¹H and¹³C NMR spectra are given for squarrofuric acid and nine of its derivatives. The mass-spectral characteristics and physicochemical constants of the compounds studied are presented.Irkutsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Irkutsk State University. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 376–384, May–June, 1987.     

Electronic structure of molecules of substituted benzenes by X-ray spectroscopy. I. Nitrobenzene

Institute of Inorganic Chemistry, Academy of Sciences of the USSR, Siberian Branch. Institute of Organic Chemistry, Academy of Sciences of the USSR, Siberian Branch. Translated from Zhurnal Strukturnoi Khimii, Vol. 28, No. 5, pp. 73–80, September–October, 1987.