名称:
A 1H, 13C and 15N NMR spectroscopic and GIAO DFT study of ethyl 5-oxo-2-phenyl-4-(2-phenylhydrazono)-4,5-dihydro-1H-pyrrole-3-carboxylate
摘要:
N-15-Labelled ethyl 5-oxo-2-phenyl-4-(2-phenylhyclrazono)-4,5-dihydro-1H-pyrrole-3-carboxylate was synthesized by azo-coupling of diazotized aniline (using Na (NO2)-N-15, 99% N-15) with ethyl 4,5-Mhydro-5-oxo-2-phenyl-(1H)-pyrrole-3-carboxylate. The product was formed as a tautomeric hydrazone mixture as confirmed by C-13 and N-15 chemical shifts, and was obtained as a mixture of F and Z isomers according to (11)J(N-15, C-13). A comparison of the H-1 NMR data with CIAO OFT calculations enabled determination of the configuration of the carboxy ester group in both isomers. (C) 2010 Elsevier Ltd. All rights reserved.