Crystal structure of 3-[dimethyl-4-phenyl-3,5-dioxacyclohexyl)-methyl]-1,5,8,11-tetraoxacyclotridecane

Institute of Applied Physics, Academy of Sciences of the Moldavian SSR. Physical Chemistry Institute, Academy of Sciences of the Moldavian SSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 3, pp. 136–138, May–June, 1991.     

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.     

Molecular structure of 1-morpholino-3-phenyl-5,6,7,8-tetrachloro-1,2,4-benzothiadiazine

Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR. Institute of Applied Physics, Academy of Sciences of the Moldavian SSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 2, pp. 172–174, March–April, 1991.     

Mass spectrometry of negative ions and the stereochemistry of organic compounds. IV. Acetates of epimeric diterpene glycols

Summary 1. It has been established that the fragmentation of the molecular negative ions of the diacetates of sclareol and of 13-episclareol takes place with the splitting out of the fragments Ac, OAc, CH₂CO, AcOH, CH₃, and CH=CH₂ without skeletal rearrangements.2. The relative yields of the negative ions formed depend on the stereochemistry of the molecules of the compounds investigated.Institute of Chemistry, Bashkir Branch of the Academy of Sciences of the USSR, Ufa. Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 454–457, July–August, 1978.     

Synthesis of bicyclohomofarnesane derivatives from bis(8α,13-epoxy-14,15-bisnorlabd-12-en-12-yl)methane — A product of the ozonolysis of sclareol

A seven-stage method of obtaining a new odoriferous product with a strong amber odor analogous to ambroxide from sclareol has been developed. It includes odoriferous oxide compounds of the tetrahydrofuran series: (VIII), (IX), (XIII), and (XIV). The key stages in the synthesis of this product are the ozonolytic cleavage of sclareol with the formation of bis(8,13-epoxy-14,15-bisnorlabd-12-en-12-yl)methane (II), its ozonolysis to bis(8-acetyl-12-oxo-13,14,15,16-tetranorlabdan-12-yl)methane (III), and the alkaline cleavage of the latter.Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishenev. Institute of Chemistry, Bashkir Scientific Center, Urals Branch, Academy of Sciences of the USSR, Ufa. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 343–349, May–June, 1991.     

X-ray structural investigation of the adduct of 1,3-di(tert-butyl)-2,4-di(tert-butylamido)diazadiphosphetidine with carbon disulfide and 2,5-diphenyl-3-cyclohexyl-4-oxo-4-cyclohexylamido-1,3,4-oxazaphospholidine

An x-ray structural investigation of the products of the reactions of 1,3-di(tert-butyl)-2,4-di(tert-butylamido)diazadiphosphetidine and 1,3-dicyclohexyl-2,4-di(cyclohexylamido)diazadiphosphetidine with carbon disulfide and benzaldehyde, respectively, has been carried out (Mo, 2006 and 1484 reflections, R=0.038 and 0.083). It has been shown that in the former reaction the four-membered P₂N₂ ring is maintained, and a new exocyclic bond appears between one of its P atoms and the carbon atom of carbon disulfide with the formation of a zwitterionic adduct with the formula C₁₅H₃₈N₄P₂·CS₂. In the latter case the P₂N₂ ring is opened, and a new five-membered heterocycle is closed with the formation of 2,5-diphenyl-3-cyclohexyl-4-oxo-4-cyclohexylamido-1,3,4-oxazaphospholidine C₂₆H₃₅O₂N₂P. The geometric parameters of both molecules investigated have been analyzed in detail.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR. A. N. Nesmeyanov Institute of Organometallic Compounds, Academy of Sciences of the USSR. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 2, pp. 133–138, March–April, 1991.     

Crystal structure of benzoylformic acid thiosemicarbazone

Institute of Applied Physics, Academy of Sciences of the Moldavian SSR. Institute of Chemistry, Academy of Sciences of the Moldavian SSR. Burevestnik [Stormy Petrel] Scientific-Industrial Association, Leningrad. Translated from Zhurnal Strukturnoi Khimii, Vol. 29, No. 5, pp. 166–169, September–October, 1988.     

Mass spectra of the coordination compounds of nickel with the tetradentate Schiff bases of S-substituted thiosemicarbazides with 2,4-pentanedione and 3-oxo-2,4-pentanedione

The mass spectra of the coordination compounds of nickel(II) with the bis-S-substituted thiosemicarbazones of 2,4-pentanedione (R₂H₂L) with the general formula [NiR₂HL]X and of 3-oxo-2,4-pentanedione (H₂R₂LO) with the general formula NiR₂LO were studied. A distinguishing feature of the mass spectra of [NiR₂HL]X is the absence of molecular ion peaks. The initial point of fragmentation is the [M - HX] ions. The strongest lines in spectra of NiR₂LO are those due to the elimination of R and R-H. At the first stage the fragmentation of all the investigated compounds takes place mainly through only one of the thiosemicarbazide residues. At the second stage the 2,4-pentanedione (3-oxo-2,4-pentanedione) residue is eliminated, after which the remaining thiosemicarbazide part dissociates. A significant part of the fragmentation paths was confirmed by the peaks of the metastable ions and also by the mass spectra of the deuterated analogs.Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 27, No. 2, 205–211, March–April, 1991. Original article submitted August 19, 1986.     

Synthesis of 15-carboxy-(−)-kaurenes

From the readily available (–)-kaurene and 6-acetoxy-18-methoxycarbonyl-(–)-kaurene the corresponding 15-carboxy derivatives have been synthesized. In biotests on the elongation of wheat coleoptiles and the introduction of the synthesis of -amylase in isolated wheat endosperms, these compounds do not exhibit gibberellin-like activity.Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Institute of Plant Physiology and Biochemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 217–220, March–April, 1981.     

Superacid isomerization of phylloclandene,isophylloclandene, and phylloclandanol

It has been established that, on interaction with a superacid, phyllocladene (XI), isophyllocladene (XV), and phyllocladan-16-ol (XIX) give identical mixtures of substances which include phyllocladene (XI), isophyllocladene (XV), neoisoatisene (XX), tetracyclic hydrocarbons with a new carbon skeleton (XXI) and (XXII), and a mixture of methyl ethers of alcohols formed as the result of the addition of methanol to the carbocations arising on the protonation of the above-mentioned hydrocarbons.Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 349–358, May–June, 1991.     

Features of the atomic and electronic structure of the new nonlinear optical crystal KAlFPO4

A precision x-ray diffraction investigation of the crystal structure and the electron density of a single crystal of KAlFPO₄ has been carried out. Partial disordering of the K⁺ ions along a 2₁ axis has been discovered. According to the maps of the deformation electron density in cross sections of the principal anionic polyhedrons in the structure, the Al–O, Al–F, and P–O bonds have a partially covalent character, and in the last case there is also a component.D. I. Mendeleev Moscow Chemical-Engineering Institute. Institute of Crystallography, Academy of Sciences of the USSR. A. N. Nesmeyanov Institute of Organometallic Compounds, Academy of Sciences of the USSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 2, pp. 103–109, March–April, 1991.     

Effect of phosphoryl and thiophosphoryl groups on CH acidities

It is shown that the CH acidities of phosphoryl and thiophosphoryl compounds depend on the substituents attached to both the carbon atom and the phosphorus atom and comply with Hammett dependences; the parameters of the correlation dependences are very close for the two types of compounds, and this makes it possible to propose a general equation for calculating the pK values of CH acids that contain a phosphoryl or thiophosphoryl group.A. N. Nesmeyanov Institute of Heteroorganic Compounds, Academy of Sciences of the USSR, Moscow. Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 27, No. 3, pp. 284–288, May–June, 1991. Original article submitted February 18, 1991.     

The structure and stereochemistry of teucrin A

Summary The structure of teucrin A has been confirmed by spectral and chemical methods and the relative configurations at all the asymmetric centers have been shown.Institute of Chemistry, Academy of Sciences of the Moldavian SSR. Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 169–175, March–April, 1973.     

Isolation of an indanone fromEquisetum arvense and its crystal and molecular structure

Summary From the herbEquisetum arvense L. an indanone compound has been isolated for the first time for which the structure of 4-hydroxy-6-(2-hydroxyethyl)-2,2,5,7-tetramethylindanone has been established by spectroscopy and x-ray structural analysis.Irkutsk Institute of Organic Chemistry, Siberian Branch of the Academy of Sciences of the USSR. Institute of Applied Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 508–513, July–August, 1978.     

Semicalassical vibronic model for the Creutz-Taube ion

Institute of Chemistry, Academy of Sciences of the Moldavian SSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No 1, pp. 44–48, January–February, 1991.     

Steroid glycosides of the roots ofCapsicum annuum. I. The structure of capsicosides A1, B1, and C1

Three new steroid glycosides of the spirostan series — capsicosides A₁, B₁, and C₁ — have been isolated from a methanolic extract of the roots of red pepper. In an investigation of the products of complete acid hydrolysis of these glycosides, a single aglycon — gitogenin — was identified. The complete chemical structure of each of the capsicosides has been shown with the aid of complete and partial acid hydrolysis, methylation and methanolysis, and periodate oxidation, and also by physicochemical methods of investigation.Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Institute of Ecological Genetics, Academy of Sciences of the Moldavian SSR, Kishinev. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 708–712, November–December, 1986.     

Crystal and molecular structure of trans-nitro-bis(dimethylglyoximato) sulfanilamide-6-(4,5-dimethoxy)pyrimidinylcobalt(III) and trans-nitrobis(dimethylglyoximato)sulfanilamide-6-(2,4-dimethoxy)pyrimidinylcobalt(III)

Institute of Applied Physics, Moldavian SSR Academy of Sciences. Institute of Chemistry, Moldavian SSR Academy of Sciences. Translated from Zhurnal Strukturnoi Khimii, Vol. 31, No. 3, pp. 77–83, May–June, 1990.     

Molecular rearrangements of tetra- and pentacyclic diterpenoids formed with the participation of pimarane intermediates

The molecular rearrangements of tetra- and pentacyclic diterpenoids formed with the participation of pimarane intermediates are considered.Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 3–16, January–February, 1991.