Details

Autor(en) / Beteiligte

• Kabaleeswaran, V.
• Rajan, S. S.
• Govindachari, T. R.
• Gopalakrishnan, Geetha

Titel

Crystal and molecular structure of Azadirachtin-A

Ist Teil von

• Current science (Bangalore), 1994-03, Vol.66 (5), p.362-364

Ort / Verlag

Bangalore: Current Science Association

Erscheinungsjahr

1994

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Azadirachtin-A isolated from the seed kernels of Azadirachta indica A. Juss has been crystallized and the structure has been studied through X-ray diffraction techniques Mr = 720.72, tetragonal, P41 a = b = 20.960(5), c = 9.415(4) Å, V = 4136(2) Å3, Z = 4, dcal = 1.157 gm c-3, λ (CuKα) = 1.5418 Å, μ = 0.74 mm-1 (F000) = 1528, T = 295°K final R = 0.071 for 2139 reflections. I > 3 σ (I). The rotation of the two bulky groups about the C8–C14 bond is – 162.4(7)° in Azadirachtin-A and is different from that in detigloyl-22,23-dihydroazadirachtin. Also there is no hydrogen bond that connects the two halves as in detigloyl-22,23-dihydroazadirachtin. The intra and inter- molecular hydrogen bondings are also quite different in these two structures.