An x-ray crystallographic, mass spectroscopic, and NMR study of the limonoid insect antifeedant azadirachtin and related derivatives

✍ Scribed by John N. Bilton; Howard B. Broughton; Philip S. Jones; Steven V. Ley; Henry S. Rzepa; Richard N. Sheppard; Alexandra M.Z. Slawin; David J. Williams; Zev Lidert; E. David Morgan

• Publisher: Elsevier Science
• Year: 1987
• Tongue: French
• Weight: 693 KB
• Volume: 43
• Category: Article
• ISSN: 0040-4020
• DOI: 10.1016/s0040-4020(01)86886-1

✦ Synopsis

The tiaonoid insect antifeedant azadiraahtin (1) mq be partial13 'H COSY experiment. Although not immediately apparent from a contour plot, small couplings, such as the H-19 methylene to H-l. H-5 and H-9 methine protons, were observable by examination of appropriate sections through the two-dimensional spectrum. Despite the broad nature of the signals due to H-7 and OH-7, it was also possible to observe this 3-bond coupling in the COSY