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Bond activation in action: Unprecedented ruthenium-catalyzed oxidative annulations of alkynes through cleavage of CH bonds set the stage for an efficient 1(2H)-isoquinolone synthesis with ample scope (see scheme; tAm=tert-amyl). Mechanistic studies provided strong evidence for a rate-limiting CH bond metalation through carboxylate assistance.
Ackermann et al. (Tue,) studied this question.