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(Top) Highlighted positions represent the expected site of highest reactivity for 5-membered heteroarenes based on Handy’s NMR model,9 Houk and Merlic’s BDE calculations,11b and electrostatic potentials at carbon,29 which are related to Leitch’s model.12 (Bottom) Summary of the actual selectivity behavior for the substrates studied by Strotman and Chobanian.30
