Synthesis and structure elucidation of three series of nitro-2-styrylchromones using 1D and 2D NMR spectroscopy

2-Styrylchromones, although scarce in nature, constitute a group of oxygen heterocyclic compounds which have shown significant biological activities. New nitro-2-styrylchromones have been synthesised by the Baker-Venkataraman method, and the structure elucidation was accomplished using extensive (1)D ((1)H, (13)C) and 2D NMR spectroscopic studies (COSY, HSQC and HMBC experiments). Copyright (C) 2009 John Wiley & Sons, Ltd.