1: KF, <18>crown-6 / benzene / 168 h / Ambient temperature 2: LiMe / tetrahydrofuran / 168 h / Ambient temperature 3: diethyl ether 4: chloro(trimethyl)silan / Ambient temperature 5: H2O View Scheme

potassium fluoride; 18-crown-6 ether in benzene 72 h;