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. Author manuscript; available in PMC: 2012 Jul 5.
Published in final edited form as: Angew Chem Int Ed Engl. 2011 Jan 5;50(7):1673–1677. doi: 10.1002/anie.201005352

Scheme 4.

Scheme 4

a) Differential activation parameters measurement from a competition experiment and b) the mechanistic rationale.