1: 1. phenylmagnesium bromide / 1. benzene, 10 min.; 2. benzene, reflux, 1 h 2: 1. 54.3percent sodium hydride in mineral oil / 1. DMSO, 40 degC, until hydrogen evolution ceased; 2. below 30 degC, 15 min. 3: phenyltrimethylammonium tribromide / tetrahydrofuran / 18 h / 35 °C View Scheme

1: 1. 54.3percent sodium hydride in mineral oil / 1. DMSO, 40 degC, until hydrogen evolution ceased; 2. below 30 degC, 15 min. 2: phenyltrimethylammonium tribromide / tetrahydrofuran / 18 h / 35 °C View Scheme