All calculations have been performed using Gaussian 16. Density functional theory (DFT) with the CAM-B3LYP functional and a IEFPCM solvent model with DCM as the solvent was used for all calculations. Different Pople style basis sets have been used and the exact basis set will be specified for each calculation. Frequency calculations have been performed for all stationary points to determine the number of imaginary frequencies, and thereby decide if the stationary points located are minima (0 imaginary frequencies) or transition states (1 imaginary frequency). All found transition states have been investigated using intrinsic reaction coordinate (IRC) calculations to confirm the transition states connect the right minima.