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Substrates shown in blue are incompatible with alternative routes. All substrates give exclusively 4-borylated regioisomer. Isolated yield of 4 (1H NMR yield of 3). Uncatalyzed: Reaction time (1H NMR yield of 3).
50 °C, 24 h.
110 °C, 4 h.
90 °C 24 h.
60 °C 24 h
50 °C, 8h
