Molecular and crystal structure of the sequiterpene lactone austricin

An x-ray structural study has been made of the sesquiterpene lactone austricin: diffractometer, MoK radiation, 1147 reflections, direct method, R=0.045. The spatial structure of the molecule has been determined. The conformation of the pentane carbocycle is 1-envelope, of the heptane ring 1,10, 7-chair, and of the lactone ring 7-envelope. The lactone ring is trans-linked with the guaiane skeleton.Institute of Organic Synthesis and Coal Chemistry, Kazakh SSR Academy of Sciences, Karaganda. A. N. Nesmeyanov Institute of Heteroorganic Compounds, USSR Academy of Sciences, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 788–791, November–December, 1989.     

Molecular and crystal structure of the sesquiterpene lactone ketopelenolide A

The boat-boat conformation of the germacrane ring of ketopelenolide A has been established by x-ray structural analysis. Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Science, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 342–346, May–June, 1990.     

Molecular and crystal structure of the sesquiterpene lactone ketopelenolide A

The boat-boat conformation of the germacrane ring of ketopelenolide A has been established by x-ray structural analysis.Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Science, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 342–346, May–June, 1990.     

Molecular and crystal structure of the sesquiterpene lactone ketopelenolide B

The spatial structure of the sesquiterpene lactone ketopelenolide B has been established.Institute of Phytochemistry, Ministry of Sciences and High Education, Republic of Kazakhstan, Karaganda, Ul. Erzhanova, a/ya 19, fax 433773, arglabin@phyto.karaganda.su. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 481–483, July–August, 1999.     

Molecular and crystal structure of jurineolide — A germacrane lactone from Jurinea multiflora

By extraction with chloroform, followed by treatment of the total extractive substances with hexane and chromatography of the resulting precipitate, the epigeal part ofJurinea multiflora has yielded a sesquiterpene lactone of the germacrolide type, jurineolide. The following spatial structure is proposed for jurineolide: 8α-(4′-hydroxytigloyloxy)-6β,7α(H)-germacra-trans-1(10),trans-4(5),11(13)-trien-6,12-olide. Institute of Organic Synthesis and Coal Chemistry, Central Kazakhstan Branch, Academy of Sciences of the Kazakh SSR. Translated from Khimiya Prirodnykh Soedinii, No. 4, pp. 490–494, July–August, 1991.     

Terpenoids of Crepis tectorum. Molecular and crystal structure of the sesquiterpene lactone 8-epideacylcynaropicrin

Sesquiterpene lactones of the guaianolide type — isolipidiol (I) and 8-epideacylcynaropicrin (II) — have been isolated from narrow-leaf hawk's-beard,Crepis tectorum L. On the basis of the results of an x-ray experiment the structure of (1R, 3S, 5R, 6R, 7R, 8R)-3,8-dihydroxy-cis,trans-guaia-4(15),10(14),-11(13)-trien-6,12-olide is proposed for (II).Institute of Organic Synthesis and Coal Chemistry, Kazakh Academy of Sciences, Karaganda. A. N. Nesmeynaov Institute of Organometallic Compounds, Russian Academy of Sciences, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 638–642, September–October, 1991.     

Terpenoids of Crepis tectorum. Molecular and crystal structure of the sesquiterpene lactone 8-epideacylcynaropicrin

Sesquiterpene lactones of the guaianolide type — isolipidiol (I) and 8-epideacylcynaropicrin (II) — have been isolated from narrow-leaf hawk's-beard,Crepis tectorum L. On the basis of the results of an x-ray experiment the structure of (1R, 3S, 5R, 6R, 7R, 8R)-3,8-dihydroxy-cis,trans-guaia-4(15),10(14),-11(13)-trien-6,12-olide is proposed for (II).     

罗丹明B内酯单晶的生长及晶体结构

从含有罗丹明B的溶胶-凝胶中首次水热合成了罗丹明B内酯的单晶,并测定了其晶体结构。每个不对称单位含有两个独立分子。     

Molecular and crystal structure of tetrahydroneosophoramine

The structure of tetrahydroneosophoramine has been studied by x-ray structural analysis. Rings A, B, and C have the chair conformation, and ring D the half-chair conformation. On the basis of a semiquantitative analysis it has been shown that the strains in the molecules of tetrahydroneosophoramine and of matrine are of the same order of magnitude.     

Molecular and crystal structure of tert-butylphosphaethyne

The crystal and molecular structure of tert-butylphosphaethyne, Bu^tCP, liquid at room temperature, has been determined by X-ray diffraction at 108 K. Main geometrical parameters are as follows: PC 1.542(2), C(sp)–C(sp³) 1.470(3) Å, PCC 179.3(2)°.     

Molecular and crystal structure of tetrahydroneosophoramine

The structure of tetrahydroneosophoramine has been studied by x-ray structural analysis. Rings A, B, and C have the chair conformation, and ring D the half-chair conformation. On the basis of a semiquantitative analysis it has been shown that the strains in the molecules of tetrahydroneosophoramine and of matrine are of the same order of magnitude.Institute of Bioorganic Chemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Institute of Crystallography, Academy of Sciences of the USSR, Moscow. V. I. Lenin Tashkent State University. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 751–757, November–December, 1981.     

Molecular and crystal structure of sophoridine

The three-dimensional structure of the alkaloid sophoridine C₁₅H₂₄ON₂ has been studied by x-ray structural analysis; the parameters of the elementary cell are: a=5.458, b=10.640, c=11.989 Å; =99.7°; z=2; space group P2₂. The experimental set was obtained on a Sinteks-P2₁ diffractometer, the structure being determined by the direct method with refinement by the method of least squares in the anisotropic approximation taking the hydrogen atoms into account to R=0.059. Ring A has the chair conformation, rings B and C the boat conformation, and ring D the half-chair conformation. The linkages of rings A/B, B/C, and C/D are trans, and of B/C cis. There are no shortened intermolecular contacts in the crystal structure of the compound.Institute of Bioorganic Chemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Institute of Crystallography, Academy of Sciences of the USSR, Moscow. V. I. Lenin Tashkent State University. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 355–362, May–June, 1979.     

Molecular and crystal structure of luteidine

The crystal structure of luteidine has been deciphered by x-ray structural analysis; there are two molecules in the independent part of its elementary cell. These symmetrically independent molecules differ in structure. The position of the olefinic methoxy group of luteidine has been established. Its structure has been determined as 1-hydroxy-2,12-dimethoxy-9,10-dihydrohomoaporphine.Institute of Biorganic Chemistry, Academy of Sciences of the Uzbek SSR, Tashkent, and V. I. Lenin Tashkent State University. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 348–352, May–June, 1986.     

Molecular and crystal structure of sophoridine N-oxide

The spatial structure of natural sophoridine N-oxide has been studied by x-ray structural analysis. It has been shown that when sophoridine is oxidized, rings B and C, which have the boat form, are deformed in the direction of the twist form.Institute of Bioorganic Chemistry of the Academy of Sciences of the Uzbek SSR, Tashkent, Institute of Crystallography of the Academy of Sciences of the USSR, Moscow, and V. I. Lenin Tashkent State University. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 588–596, September–October, 1981.     

Molecular and crystal structure of 2,6-dichloronaphthalene

Journal of Structural Chemistry -