Structure of azadirachtin-I, 11 β-H epimer

Malathi, R. ; Kabaleeswaran, V. ; Rajan, S. S. ; Gopalakrishnan, Geetha ; Govindachari, T. R. (2003) Structure of azadirachtin-I, 11 β-H epimer Journal of Chemical Crystallography, 33 (4). pp. 229-232. ISSN 1074-1542

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The 11 β-H epimer of Azadirachtin-I, isolated from the seed kernels of Azadirachta indica A. Juss (Neem), was characterized by both NMR and X-ray crystallographic techniques. NMR data reveals that the H11 proton is in β-orientation and the X-ray studies confirm this observation. The compound crystallized in space group P21 with the cell parameters a = 11.933(2) Å, b = 7.752(5) Å, c = 17.241(9) Å, β= 106.80(3)°. Though the structural features are similar to the 11 β-H epimer of Azadirachtin-H, the orientation of the acetoxy group at C3 is different. The dihedral angle C9-C8-C14-O13, which describes the relative orientation of the modified decalin and modified furan moities of the molecule, is 23.3(8)°.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
Keywords:Azadirachta Indica A Juss; Azadirachtin-i; 11 β-H Epimer; Crystal Structure
ID Code:15223
Deposited On:13 Nov 2010 06:50
Last Modified:01 Jun 2011 17:12

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