These observations challenge the hypothesis that the reaction is accelerated in water due to the stabilisation of the TS by enhanced HB interactions compared to the RS, as suggested in previous studies. These differences can be attributed to the differing dynamics employed in the studies. For example, Houk et al. investigated the reaction in water using downhill dynamics from the TS and observed shorter HBs bond length and more linear bond angle at TS compared with RS and PS. In this approach, the TS with solvent molecules is fully optimised, and the solvent does not undergo complete reorganisation at RS or PS as the trajectory approaches the RS or PS at a faster rate than the reorganisation process due to the absence of energy barriers to overcome.