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. 2016 Oct 21;8(2):1442–1449. doi: 10.1039/c6sc03745c

Fig. 2. Mechanisms of lactone-forming C–H insertion reactions. (a) The previously proposed mechanism for five-membered ring formation proposed by Yoshikai and Nakamura.17,18 (b) Our proposed mechanism for β-lactone formation, involving a PTSB.

Fig. 2