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. Author manuscript; available in PMC: 2021 Aug 12.
Published in final edited form as: Chem Rev. 2020 Jul 5;120(15):7104–7151. doi: 10.1021/acs.chemrev.0c00243

Figure 25.

Figure 25.

Sialyl triflate stabilized by a strongly electron-withdrawing protonated picolinyl ester, and the alternative high energy intermediate arising from intramolecular participation.