... of the reaction, along with the simple procedure for isolation and purification, certainly makes this chemistry a highly ... for DMSO-d 6 ). Data for 13 C NMR spectra are reported in terms of chemical shift (δ ... 1630, 1565; 1 H NMR (300 MHz, CDCl 3 ) δ 8.61 (s, 1H), 8.13 (dd, J=9.0, 3.0 ...