185062-89-9Relevant academic research and scientific papers
Steroid and nitro phenol esters from Bignonia unguis-cati roots
Dinda, Biswanath,De, Utpal Chandra,Achari, Basudev,Arima, Shiho,Sato, Nariko,Harigaya, Yoshihiro
, p. 1514 - 1518 (2007/10/03)
Two new esters, β-sitosterol cerotate 1 and 2-(4-hydroxy-3-nitrophenyl)ethyl stearate 2 have been isolated from the roots of Bignonia unguis-cati (Bignoniaceae) and their structures are elucidated by spectroscopic and chemical studies.
Synthesis and molecular structure of new phosphorous-crown compounds containing the thiophosphoryl group
Declercq, Jean-Paul,Delangle, Pascale,Dutasta, Jean-Pierre,Van Oostenryck, Luc,Simon, Pascal,Tinant, Bernard
, p. 2471 - 2478 (2007/10/03)
The synthesis and characterization of four phosphorus macrocycles (1-4) are reported. The X-ray crystal structures of compounds 1-4 and solvate 1-H2O show the molecules in asymmetric conformations with at least one methyl group of the phenoxy substituants oriented toward the centre of the macrocyclic cavity. Variable-temperature 1H NMR experiments show that in solution the molecules exist mainly as rapidly interconverting conformers. In the 18-membered ring 1, the dynamic process results in the enantiomerization of asymmetric conformers with a barrier of 8 kcal mol-1.? The 21-membered ring 3 is more flexible and exists in several conformations.
