toluene-4-sulfonic acid in benzene 2 h; Ambient temperature;

1: 47 percent / stannic chloride / various solvent(s) / 15 h / Ambient temperature 2: NaBH4 / methanol / 0.25 h 3: 82 percent / toluene-p-sulphonic acid / benzene / 2 h / Ambient temperature View Scheme

1: 85 percent / thionyl chloride / Ambient temperature 2: 47 percent / stannic chloride / various solvent(s) / 15 h / Ambient temperature 3: NaBH4 / methanol / 0.25 h 4: 82 percent / toluene-p-sulphonic acid / benzene / 2 h / Ambient temperature View Scheme

1: NaBH4 / methanol / 0.25 h 2: 82 percent / toluene-p-sulphonic acid / benzene / 2 h / Ambient temperature View Scheme