acetic anhydride; sulfur 1.) heating, 2.) 220 deg C, 4 h; Multistep reaction;

1: 1.) acetic anhydride, 2.) sulphur / 1.) heating, 2.) 220 deg C, 4 h 2: 89 percent / lithium aluminum hydride / tetrahydrofuran / Heating View Scheme

1: 1.) acetic anhydride, 2.) sulphur / 1.) heating, 2.) 220 deg C, 4 h 2: 89 percent / lithium aluminum hydride / tetrahydrofuran / Heating 3: 54 percent / phosphorus tribromide / benzene / Heating View Scheme