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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 3. Impact of reagent order on site-selectivitya,b,c,d,e.

Scheme 3.

aYields and ratios reported as in Table 1.bYield calculated by1H NMR using 1,3,5-trimethoxybenzene as an internal standard.cx+y represents a bis-phosphonium salt.diso refers to an unidentified phosphonium salt isomer.eMixture of two undefinited isomers