The thermochemistry was calculated according to a set of high-level composite quantum chemistry methodologies based on a CCSD(T)/CBS+HOE+CV+REL+DBOC+SO+ZPVE+ANH strategy (outlined below) inspired by the ANL0/ANL1 family of methods. The method at which every component of each CBH reaction energy was obtained is outlined in Table , using abbreviations for the basis sets. For each entry in Table , the single-point energies for all the species used in the given CBH scheme were treated at the specified level of theory, using converged minimum structures at the level of theory indicated for geometries.