Patent · US Expired

Preparation of 4,4'-dihydroxybiphenyl

US4922031A · kind A · utility

0Cited by

7References

5Claims

0Family size

Assignee

BASF SE

Inventors

Ulrich Eichenauer · Frankfurt, DE
Peter Neumann · Wiesloch, DE

Key dates

Filing date	Jan 23, 1989
Grant date	May 1, 1990
Priority date	—
Expiry date	Jan 23, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C37/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

4,4'-dihydroxybiphenyl is prepared by treating biphenyl-4,4'-disulfonic acid or one of its alkali metal salts in an alkali metal hydroxide melt by a process in which the treatment is carried out in a melt which contains from 7 to 14 moles of potassium hydroxide and from 0 to 8 moles of sodium hydroxide, based in each case on 1 mole of biphenyl-4,4'-disulfonic acid, in the presence of an alkali metal carbonate at from 280.degree. to 360.degree. C.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.