Figure 7.
High-resolution ESI-MS analysis (rt) of the reaction (A): reaction mixture of Cu(OTf)2 and 1a in ethyl acetate at 120 °C for 1 h; (B): reaction mixture of Cu(OTf)2, 1a and tBuOOtBu in ethyl acetate at 120 °C for 1 h.
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