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Conditions: (i) Mohr’s salt (5 mol %), APS (2 equiv), anhydrous degassed CH3CN, 65 °C, 3 h; (ii) Mohr’s salt (5 mol %), APS (1 equiv), CH3CN/[18O]H2O 3:1, 45 °C, 1 h; (iii) Mohr’s salt (5 mol %), APS (1 equiv), CH3CN/H2O 3:1, 45 °C, 1 h.
