Fargesin, C_(21) H_(22)O_6, was extracted from the buds of Magnolia biondii Pamp and its structure was determined by X-ray crystallographic analysis , M_r = 370. 40, monoclinic, P2_1 , a= 9. 737(2) , b= 6. 665(1) , c=...Fargesin, C_(21) H_(22)O_6, was extracted from the buds of Magnolia biondii Pamp and its structure was determined by X-ray crystallographic analysis , M_r = 370. 40, monoclinic, P2_1 , a= 9. 737(2) , b= 6. 665(1) , c= 14. 584 (2)A , β=90. 41 (1)°, V= 946. 5 (3) A￣3 Z= 2, F(000) = 392, D_c= 1. 303 g/cm3. The structure was solved by direct methods and refined to a final R= 0. 0358 using 1207 observed reflections with I≥ 3σ(I). The molecule was revealed as a compound of bisepoxy lignan with asymmetrical substitutions. The relative configuration from Xray diffraction analysis was in agreement with that of ￣(13)C NMR spectrum analysis.展开更多
文摘Fargesin, C_(21) H_(22)O_6, was extracted from the buds of Magnolia biondii Pamp and its structure was determined by X-ray crystallographic analysis , M_r = 370. 40, monoclinic, P2_1 , a= 9. 737(2) , b= 6. 665(1) , c= 14. 584 (2)A , β=90. 41 (1)°, V= 946. 5 (3) A￣3 Z= 2, F(000) = 392, D_c= 1. 303 g/cm3. The structure was solved by direct methods and refined to a final R= 0. 0358 using 1207 observed reflections with I≥ 3σ(I). The molecule was revealed as a compound of bisepoxy lignan with asymmetrical substitutions. The relative configuration from Xray diffraction analysis was in agreement with that of ￣(13)C NMR spectrum analysis.
