In a dry, 500-mL, three-necked flask equipped with a mechanical stirrer, an addition funnel, and a nitrogen inlet are placed 25.6 g (0.20 mol) of
naphthalene, 250 mL of dry tetrahydrofuran (THF), and 10.8 g (0.47 mol) of sodium pieces. The mixture is stirred at room temperature for 30 min.
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