How can a reaction shown in Scheme 1 and generating the proposed free C2 overcome a reaction endo-energicity G298 of +47 kcal/mol, the most accurate estimate obtained by the computations reported here. Eyring theory tells us that at 298K, reactions with respectively a half-life of 1 minute and 1 hour correspond to free energy barriers of 20.0 or 22.5 kcal/mol, significantly lower than the range of energies predicted above. There are several possibilities to consider.