Characterization of 4,5-Dihydro-1H-Pyrazole Derivatives by 13C NMR Spectroscopy

The 13 C NMR resonances of 19 1‐acyl‐3‐(2‐nitro‐5‐substitutedphenyl)‐4,5‐dihydro‐1H‐pyrazoles, and 19 1‐acyl‐3‐(2‐amino‐5‐substituted)‐4,5‐dihydro‐1H‐pyrazoles, were completely assigned using the concerted application of one‐ and two‐dimensional NMR experiments (DEPT, gs‐HSQC and gs‐HMBC). Copyright © 2012 John Wiley & Sons, Ltd. The 13C NMR chemical shifts of 19 1‐acyl‐3‐(2‐nitrophenyl‐5‐substituted)‐4,5‐dihydro‐1H‐pyrazoles,and 19 1‐acyl‐3‐(2‐amino‐5‐substituted)‐4,5‐dihydro‐1H‐pyrazoles, were assigned and discussed using mono‐ and bi‐dimensional resonance techniques.