Table 3. Relative Free Energies in kcal/mol at 433.15 K in the DMF solution with Respect to the Preceding Intermediate for the Ru-Catalyzed [2 + 2] and HDA [2 + 2 + 2] Cycloadditions of Norbornadiene 1 with Alkynyl Phosphonates 10a,e–h.
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