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a. Reaction manifold showing the equilibration among 1 + 2, four isomeric anhydrides 12, lactone acids 13 and 14, and mono-furfuryl itaconates 15. b. DFT [M06-2X/6-31+G(d,p)(SMD:CHCl3), see SI for details] free energies (kcal•mol−1) of the four isomeric lactone esters from ring opening of 12-prox-endo and 12-prox-exo and the (more stable) mono-furfuryl itaconate esters 15a and 15b.
