Single point ab initio calculations for a number of molecules, using various procedures with 3-21G or AM1 geometries, show that the AM1-based results seem to be better for high level ab initio procedures and for studies of reactions, as well as requiring less computing time.
M. J. S. Dewar, A. J. Holder, E. F. Healy and S. Olivella, J. Chem. Soc., Chem. Commun., 1989, 1452 DOI: 10.1039/C39890001452
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