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. Author manuscript; available in PMC: 2021 Apr 22.
Published in final edited form as: J Am Chem Soc. 2020 Apr 6;142(16):7598–7605. doi: 10.1021/jacs.0c01724

Figure 4.

Figure 4.

Mechanistic experiments. Standard conditions are the same as in Figure 1, entry 1. a Yields were determined by 1H NMR using 1,3,5-tri-methoxybenzene (1.0 equiv) as an external standard. b Isolated yield.