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Recebido em 5/11/99; aceito em 17/1/00 Four commonplace concerted reactions are examined using (i) correlation diagrams, (ii) frontier molecular orbital analyses for transition states, (iii) Zimmerman-Dewar analyses for transition states and (iv) modified Zimmerman-Dewar analyses for transition states. Only the latter approach is consistently satisfactory.doi:10.1590/s0100-40422000000500021 fatcat:lubfm3hjsva3dhd5tx335wxus4