1: 1) NaOH / 1) DMF, stirred ovenight; 2) reflux 2 h 2: 1) Mg, dibromomethane / 1) reflux, overnight, THF; 2) benzene, -78 deg C, warmed to room temp., reflux overnight View Scheme

2: 1) NaOH / 1) DMF, stirred ovenight; 2) reflux 2 h 3: 1) Mg, dibromomethane / 1) reflux, overnight, THF; 2) benzene, -78 deg C, warmed to room temp., reflux overnight View Scheme

1: 1) NaOH / 1) DMF, stirred ovenight; 2) reflux 2 h 2: 1) Mg, dibromomethane / 1) reflux, overnight, THF; 2) benzene, -78 deg C, warmed to room temp., reflux overnight View Scheme

magnesium; 1,1-dibromomethane 1) reflux, overnight, THF; 2) benzene, -78 deg C, warmed to room temp., reflux overnight; Yield given. Multistep reaction;