Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

1: 1-bromo-2,4,6-trislt;bis(trimethylsilyl)methylgt;benzene With tert.-butyl lithium in tetrahydrofuran; pentane T=-78°C; 0.5 h; 2: With phosphorus trichoride in tetrahydrofuran; pentane T=20°C; 15 h; 3: methyllithium in tetrahydrofuran; diethyl ether T=-78 - 20°C;

1: tetrahydrofuran 3: tetrahydrofuran 5: hexane View Scheme

1: tetrahydrofuran 3: tetrahydrofuran 5: benzene-d6 View Scheme

With  bromine in  tetrachloromethane