Patent · US Expired

Process for preparing hydroxydiphenyl

US3933924A · kind A · utility

3Cited by

4References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Oskar Weissel · Krefeld, DE
Horst Koller
Hans-Helmut Schwarz · Krefeld, DE

Key dates

Filing date	Mar 11, 1974
Grant date	Jan 20, 1976
Priority date	—
Expiry date	Mar 11, 1994

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C37/07
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Hydroxydiphenyl is prepared by dehydrogenating a starting material comprising completely and/or partly hydrogenated hydroxydiphenyl in a gaseous phase in the presence of a dehydrogenation catalyst and a compound having the formula ##SPC1## Wherein PA1 R.sup.1, r.sup.2 and R.sup.3, which may be the same or different, each represents a linear or optionally branched alkyl radical having up to 6 carbon atoms, in addition to which R.sup.3 can also represent a hydrogen atom, Is added as a stabilizer to the starting material before it comes into contact for the first time with and and/or other oxygen-containing gases.

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