We set out to compute the total energy and via normal mode wavenumbers, the Gibbs energy at the coordinates specified in the ESI. These coordinates for the endo-TS series for all the gas-phase and continuum solvent models in the ESI were found to be identical, as were the coordinates for the endo-ylid reactant 2 preceding the transition state. One possible inference is that gas-phase coordinates were used without re-optimisation for all the solvent models. The coordinates for the exo-TS series were however all different for the solvent/gas phase models, whilst those for reactants 3 were all numerically identical. This leaves open a possibility that the differing coordinates for the exo-TS series had indeed been re-optimised for the continuum solvent and that the inclusion of identical coordinates for the endo-TS series are simply errors resulting from copy/paste operations used to prepare the ESI.