Determination of absolute configuration using X-ray diffraction
نویسندگان
چکیده
منابع مشابه
Assignment of Absolute Configuration of a New Hepatoprotective Schiartane-Type Nortriterpenoid Using X-Ray Diffraction.
A new schiartane-type nortriterpenoid, micrandilactone H was isolated from Kadsuralongipedunculata Finet et Gagnep. Its 2D (two dimension) structure was elucidated by NMR spectroscopic analysis, and it is similar to that of Kadnanolactones H and the absolute configuration was established through X-ray diffraction and ECD data analysis. This represents the first complete assignment of the absolu...
متن کاملAssignment of Absolute Configuration of a New Hepatoprotective Schiartane-Type Nortriterpenoid Using X-ray Diffraction "2279
A new schiartane-type nortriterpenoid, micrandilactone H was isolated from Kadsura longipedunculata Finet et Gagnep. Its 2D (two dimension) structure was elucidated by NMR spectroscopic analysis, and it is similar to that of Kadnanolactones H and the absolute configuration was established through X-ray diffraction and ECD data analysis. This represents the first complete assignment of the absol...
متن کاملX-ray-diffraction study and determination of absolute configuration of the anticancer drug S(--)cyclophosphamide (Endoxan, Cytoxan, NSC-26271).
(--)Cyclophosphamide(1) crystallized from tetrachloromethane in the triclinic space group P1 with cell dimensions a = 10.500 (4) A, b = 10.490 (4) A, c = 10.761 (4) A, alpha = 110.0 (2) degrees, beta = 110.0 (2) degrees, gamma = 108.9 (2) degrees. Three molecules are contained in the unit cell. The X-ray analysis was based on diffractometer measurement of 2635 independent reflections and the st...
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We report synchrotron energy determinations using the powder diffraction patterns of Si (640b) and LaB6 (660) standard reference powders at a number of energies between 5 and 20 keV. The fitted peak positions of all peaks recorded on image plates were used in each energy determination. Several sources of systematic error were investigated and their connection led to physically reasonable and co...
متن کاملHigh-precision laser-assisted absolute determination of x-ray diffraction angles.
A novel technique for absolute wavelength determination in high-precision crystal x-ray spectroscopy recently introduced has been upgraded reaching unprecedented accuracies. The method combines visible laser beams with the Bond method, where Bragg angles (θ and -θ) are determined without any x-ray reference lines. Using flat crystals this technique makes absolute x-ray wavelength measurements f...
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ژورنال
عنوان ژورنال: Tetrahedron: Asymmetry
سال: 2017
ISSN: 0957-4166
DOI: 10.1016/j.tetasy.2017.08.018