Bis-4-chloro-phenyl sulphone prodn. - from chloro-benzene, bis-tri:methyl-silyl pyrosulphate and sulphur tri:oxide

摘要

Prodn. of bis(4-chlorophenyl) sulphone (I) is effected by reacting chlorobenzene (II) with bis(trimethylsilyl) pyrosulphate (III) and SO3 at 20-100 deg.C. (III) is formed with situ from bis(trimethylsilyl) sulphate (IV) and SO3. The (III):SO3 molar ratio is 0.1-10:1, esp. 0.5-1.2:1. The (II):SO3 molar ratio is 0.1-20:1, esp. 0.9-2:1.