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author:("Wang, raji")
1.  Benzyl 3-dehydr­oxy-1,2,5-oxadiazolo[3′,4′:2,3]oleanolate 
The title compound, C37H50N2O3, is a benzyl ester derivative of oleanolic acid, a penta­cyclic triterpene, with a five-membered oxadiazole ring fused to the ring A. The triterpene A and C rings adopt slightly distorted half-chair conformations, whereas the remaining three six-membered rings are in chair forms.
doi:10.1107/S1600536809026695
PMCID: PMC2977140  PMID: 21583566
2.  1,2,5-Oxadiazolo[3,4-b]glycyrrhetinic acid 
The title compound [systematic name: 11-oxo-2,3-(oxy­dinitrilo)olean-12-en-29-oic acid], C30H42N2O4, contains a linear array of five six-membered rings and a five-membered heterocyclic ring. The C ring, containing an α,β-unsaturated ketone, has a slightly distorted half-chair conformation, as does the A ring, with N—C—C angles 125.3 (5), 111.2 (4), 124.9 (5) and 109.2 (5)°, while the other three six-membered rings adopt chair conformations. The enanti­omer has been assigned by reference to unchanging chiral centres in the synthetic procedure. An intramolecular C—H⋯O interaction is present. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds link the mol­ecules.
doi:10.1107/S1600536809020996
PMCID: PMC2969501  PMID: 21582833
3.  2,4-Dinitro­benzaldehyde hydrazone 
The title compound, C7H6N4O4, plays an important role in the synthesis of biologically active compounds. The planar hydrazone group is oriented at a dihedral angle of 8.27 (3)° with respect to the benzene ring. In the crystal structure, inter­molecular N—H⋯O and N—H⋯N hydrogen bonds link the mol­ecules.
doi:10.1107/S1600536808007514
PMCID: PMC2960920  PMID: 21202135

Results 1-3 (3)