Organic Syntheses Procedure
Tetrahydrofuran (THF, 250 mL, 0.1 M) (Note 22) is added to the flask by a syringe through a rubber septum on the side neck.The clear colorless solution is cooled to -45 °C (dry ice in acetonitrile) (Figure 10A) for 1 h. To the solution is added n-butyllithium (9.2 mL of 2.6 M in hexane (checker), 24 mmol, 1.25 equiv) (Note 23) dropwise by a syringe through a rubber
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