Patent · US Expired

Process for preparing substituted aromatic and heteroaromatic aldehydes and carboxylic acids

US6518455B1 · kind B1 · utility

0Cited by

3References

9Claims

0Family size

Assignee

DSM Fine Chemicals Austria NFG GmbH & Co KG · AT

Inventors

Gerhard Steinbauer · Ansfelden, AT
Karlheinz Giselbrecht · Pasching, AT
Manfred Schoftner · Linz, AT
Klaus Reiter · Linz, AT

Key dates

Filing date	Dec 28, 1999
Grant date	Feb 11, 2003
Priority date	—
Expiry date	Dec 28, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C303/22
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing substituted aromatic and heteroaromatic aldehydes or carboxylic acids of the formula in which R1 and R2 are H, C1-C4 alkyl, C1-C4 alkoxy, OH, NO2, CN, COOH, CONH2, COOR, NH2, SO3H or halogen and R is C1-C4 alkyl and where R1 and R2 are not simultaneously H, X is C or N and Z is CHO or COOH, from the corresponding symmetric stilbene compounds of the formula in which R1, R2 and X are as defined above, by aqueous ozonolysis and subsequent isolation of an aldehyde or oxidation to give the corresponding carboxylic acid.

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