Patent · US Expired

Process for the preparation of 2,3,5-trimethyl-p-benzoquinone

US6262311A · kind A · utility

6Cited by

2References

6Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Ralf Maassen · Lechenich, DE
Steffen Krill · Mühltal, DE
Barbara Jäger · Zellhausen, DE
Klaus Huthmacher · Gelnhausen, DE

Key dates

Filing date	Oct 16, 2000
Grant date	Jul 17, 2001
Priority date	—
Expiry date	Oct 16, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C46/08
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for the preparation of 2,3,5-trimethyl-p-benzoquinone by oxidizing 2,3,5-trimethylphenol or 2,3,6-trimethylphenol with oxygen or an oxygen-containing gas mixture in the presence of a catalyst system which can be a copper halide and a transition metal halide; for example iron, chromium, manganese, cobalt, nickel, zinc or a rare earth halide, in a two-phase reaction medium, at elevated temperature.

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