Fig. 3. Yields of Diels–Alder reactions under various ball-milling conditions. Note: all nine conditions produce overlapping yields for E a 8.9, 11.9, 14.9, and 17.4 kcal mol–1. Individual plots are available in the ESI (S14†). Teflon (PTFE), stainless steel (SS), and hardened steel (HS). Inset: population of energies determined by Boltzmann distribution overlaid on top of yield data.
