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Reagents and conditions: (a)431 Na (8 equiv), 18-crown-6, THF, Ar, 25 °C, 48 h; (b) Cs (2 equiv), 18-crown-6, THF, Ar, 25 °C, 5 min; (c) Cs (5 equiv), 18-crown-6, THF, argon, 25 °C, 30 min.
