Table 1 B3LYP/6-31G* - SCIPCM (including ZPE corrections, gas phase values in parentheses) and PM3 - SCRF computed energies (in kJmol-1) of tautomers A, (E)-B, (Z)-B, and C for compounds 7 and 8

Table 2 PM3 - SCRF computed activation energies (in kJmol^-1) for paths A - D for compounds 1A, (Z)-1B and 2.