1: (4-bromophenylethynyl)trimethylsilane With n-butyllithium in diethyl ether T=-78°C; Inert atmosphere; 2: dimethyl-dichlorosilane in diethyl ether T=20°C; Inert atmosphere;

1: triethylamine; CuI; PPh3 / (Ph3P)2PdCl2 / Heating 2: sodium hydroxide / methanol; tetrahydrofuran / Heating View Scheme

sodium hydroxide in tetrahydrofuran; methanol Heating;