Further computaOonal analysis was undertaken to understand the polarisaOon of the newly formed covalent bonds in 2a-c, along with the direcOon of charge transfer in TS-1. Natural PopulaOon Analysis (NPA) charges show accumulaOon of negaOve charge on the central main group element of 2a-c, with each Zn centre being significantly electroposiOve (Figure ). NPA fragment charges were also considered and substanOate the same conclusions with negaOve charge build up on the main group b-dikeOminate fragment and posiOve charge accumulaOon on each of the ZnCp* fragments (see supporOng informaOon).