Polysulfones are manufactured by reacting a sulfuric acid or sulfur trioxide with a bireactive aromatic compound, using as a "promoter" a carboxylic acid anhydride. The product polymers are useful as molding resins.

 
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> Oxidative carbonylation of toluene catalyzed by rhodium and iridium

> Process for the manufacture of 1,1,1,3,3-pentafluoropropene, 2-chloro-pentafluoropropene and compositions comprising saturated derivatives thereof
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