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1.
S. Bamidele Sanni H. Behm Paul T. Beurskens E. Kayode Adesogan James I. Durodola 《Journal of chemical crystallography》1988,18(5):575-582
A new cytotoxic macrocyclic diterpenoid named Japodagrol, C20H28O4, has been isolated from the ornamental plantJatropha podagrica, family Euphorbiaceae, grown in Nigeria. The structure of the title compound, C20H28O4, was solved by X-ray analysis.M
r
=332.44, monoclinic space groupC2,a=23.285(4),b=6.5105(12),c=12.505(3) Å,=98.504(17),V=1874.8 Å3,Z=4,D
c
=1.178 Mg/m3. CuK radiation (graphite crystal monochromator, =1.54184 A), (CuK)=6.13 cm–1,F(000)=720,T=290 K. Final conventionalR factor=0.035,R
w
=0.038 for 3349 observed reflections. The structure was solved with the programDirdif. The 5-membered ring is closed to a half-chair form. The compound contains inter- and intramolecular hydrogen bonds. 相似文献
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J. M. M. Smits P. T. Beurskens R. Plate H. C. J. Ottenheijm 《Journal of chemical crystallography》1986,16(6):941-948
The structure of the title compound, C22H22N2O3, was determined by X-rays atT=290 K.M
r
=362.427, orthorombic, space groupPbca,a=11.666(4),b=15.691(1),c=20.931(1) Å,V=3831.4 Å3,Z=8,D
x
=1.257 Mgm–3. CuK radiation (graphite crystal monochromator, =1.54178 Å),(CuK)=6.42 cm–1. Final conventionalR-factor=0.050,R
w
=0.062 for 2552 observed reflections and 301 variables. The structure was solved usingMultan. 相似文献
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V. Parthasarathi Paul T. Beurskens H. J. J. Behm S. Garcia-Granda M. Krishna Pillay 《Journal of chemical crystallography》1986,16(6):833-840
The structure of the the title compound, C30H29NO, was determined by X-rays.M
r
=419.57, triclinic, space groupP1,a=5.8922(12),b=8.5855(11),c=12.2216(20) Å,=78.145(12)°,=79.181(15)°, =76.108(14)°,V
c
=581.1(1) Å3,Z=1,D
x
=1.199 Mg m–3. CuK radiation (graphite crystal monochromator, =1.54184 Å),(CuK)=5.17 cm–1,T=290K. Final conventionalR-factor=0.039,R
w
=0.042 for 2795 observed reflections and 377 variables. The structure was solved usingMultan andDirdif. With a view to determining the conformational preference of the piperidine ring when it is highly sustituted with a bulky group like the phenyl group, the present X-ray investigation was undertaken. 相似文献
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Gezina Beurskens C. F. Martens R. J. M. Nolte Paul T. Beurskens J. M. M. Smits 《Journal of chemical crystallography》1995,25(7):425-427
The crystal and molecular structure of a pyridine complex of anhydrous copper(II)nitrate is described. The structure has been solved by vector search methods and refined by least-squares methods to R1=0.049 [I>2(I)]. The complex lies on a twofold axis parallel toa, and two solvent pyridine molecules lie on twofold axes parallel toc. The copper atom is coordinated by four pyridyl groups and two monodentate NO3 groups. Crystal data: C30H30N8O6Cu, orthorhombic, space group Pnna(52),a=14.446(7),b=12.154(5),c=16.881(4) Å,V=2964(2) Å3,Z=4. 相似文献
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