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. Author manuscript; available in PMC: 2018 Dec 5.
Published in final edited form as: J Am Chem Soc. 2018 May 24;140(25):8020–8026. doi: 10.1021/jacs.8b04530

Scheme 2. Effect of base on reactivity and site-selectivitya, b.

Scheme 2.

aYields and ratios reported as in Table 1.bYields calculated by1H NMR spectroscopy of the crude reaction mixture.