These trace anions are present with relative intensities that do not always reflect ΔGi-qh-tr in Table . For example, the intensity of [4,3-OH] -and [6,4-OH] -differ by about a factor of 440 (Table ) corresponding to an energy difference of 15 kJ mol -1 . While ΔGi-qh-tr values differ by ca. 30 kJ mol -1 , ΔΔG-qh-tr/n values at MP2 level are actually quite close to experiment. We suspect that the intensities of some observed anions, especially those with OH groups, also correlate with their importance as intermediates in the primary hydrolysis of Me3Al.