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Evidence of an nN(amide) → π*Ar Interaction in N-Alkyl-N,N'-diacylhydrazines.

Jugal Kishore Rai DekaBiswajit SahariahSushil S SakpalArun Kumar BarSayan BagchiBani Kanta Sarma
Published in: Organic letters (2021)
1,2-Dibenzoyl-1-tert-butylhydrazine (RH-5849) and related N-alkyl-N,N'-diacylhydrazines are environmentally benign insect growth regulators. Herein, we show that an unusual nN(amide) → π*Ar interaction mediated by a hydrazide amide nitrogen atom plays a crucial role in stabilizing their biologically active trans-cis (t-c) rotameric conformations. We provide NMR and IR spectroscopic evidence for the presence of these interactions, which is also supported by X-ray crystallographic and computational studies.
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