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a Reaction conditions: BCB 1 (0.3 mmol), alkene 2 (0.1 mmol), Na2SO4 (0.17 mmol), 80 °C in DMSO (0.1 mL) under argon, 48 h, isolated yield. b Reaction conditions: BCB 1 (0.2 mmol), alkene 2 (0.1 mmol), Na2SO4 (0.17 mmol), 130 °C in DMSO (1.0 mL) under argon, 48 h, isolated yield.
