thionyl chloride; triethylamine 1.) room temperature, CHCl3, 2.) room temperature, 24 h, benzene; Yield given. Multistep reaction;

1: Natriumhydrogenecarbonat / 0.5 h / 80 °C 2: 80 percent / PCl5 / 2 h 3: 1.) Na2SO3, Na2CO3, 2.) Tetrabutylammonium bromide / 1.) 5 min, reflux, water, 2.) 24 h, reflux, 1,2-dimethoxyethane 4: 1.) Thionylchlorid, 2.) Triethylamin / 1.) room temperature, CHCl3, 2.) room temperature, 24 h, benzene View Scheme

1: 80 percent / PCl5 / 2 h 2: 1.) Na2SO3, Na2CO3, 2.) Tetrabutylammonium bromide / 1.) 5 min, reflux, water, 2.) 24 h, reflux, 1,2-dimethoxyethane 3: 1.) Thionylchlorid, 2.) Triethylamin / 1.) room temperature, CHCl3, 2.) room temperature, 24 h, benzene View Scheme

1: 1.) Na2SO3, Na2CO3, 2.) Tetrabutylammonium bromide / 1.) 5 min, reflux, water, 2.) 24 h, reflux, 1,2-dimethoxyethane 2: 1.) Thionylchlorid, 2.) Triethylamin / 1.) room temperature, CHCl3, 2.) room temperature, 24 h, benzene View Scheme