Patent · US Expired

Process for the preparation of 2,3,5-trimethylhydroquinone diesters

US6103924A · kind A · utility

2Cited by

3References

21Claims

0Family size

Assignee

Degussa-Huels AG · DE

Inventors

Nongyuan Shi · Hanau, DE
Mario Scholz · Zöblitz, DE
Steffen Hasenzahl · Hanau, DE
Horst Weigel · Rodenbach, DE
Bernd Drapal · Alzenau, DE
Ralph McIntosh · Hanau, DE
Hans Joachim Hasselbach · Gelnhausen, DE
Klaus Huthmacher · Gelnhausen, DE

Key dates

Filing date	Apr 21, 1999
Grant date	Aug 15, 2000
Priority date	—
Expiry date	Apr 21, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C67/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Preparation of 2,3,5-trimethylhydroquinone diesters by rearrangement of 2,6,6-trimethylcyclohex-2-ene-1,4-dione (4-oxo-isophorone, ketoisophorone) in the presence of a solid, acid catalyst and an acylating agent, for example carboxylic acid anhydrides or carboxylic acid halides. The 2,3,5-trimethylhydroquinone diester may then optionally be saponified to the free 2,3,5-trimethylhydroquinone, which is a valuable building block in the synthesis of vitamin E.

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