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US 5,008,472 AGranted
Preparation of 4,4"-dihydroxyterphenyl
AssigneeBASF SE
InventorUlrich Eichenauer
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Abstract
4,4'-Dihydroxyterphenyl is prepared by sulfonating terphenyl with sulfuric acid, sulfur trioxide, a mixture thereof or chlorosulfonic acid and then treating the resulting terphenyl-4,4'-disulfonic acid, which may be first converted into a dialkali metal salt, with an alkali metal hydroxide.
Claims5
A process for preparing 4,4"-dihydroxyterphenyl, which comprises:
- (a) sulfonating terphenyl with a sulfonating agent selected from the group consisting of sulfuric acid, sulfur trioxide, a mixture thereof, or chlorosulfonic acid, and
- (b) treating the resulting terphenyl-4,4"-disulfonic acid with an alkali metal hydroxide.
Dependencies are inferred from the claim text.