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Reaction conditions: aryl carbamates or sulfamates(1 mmol), aryl boronic acids (1 mmol), NaOC2H4OH (2.0 mmol), Fe3O4@SiO2–EDTA–Ni(II) catalyst (0.018 g, 1 mol %), EG (3 mL), 100 °C, 6 h.
Isolated yield.
