Patent · US Expired

Method for producing substituted nitro benzoic acids by oxidation of corresponding nitro toluenes, nitrol benzyl alcohols, esters and/or ethers

US6900349B2 · kind B2 · utility

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17Claims

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Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Reinhard Langer · Krefeld, DE
Lars Rodefeld · Leverkusen, DE
Karl H. Neumann · Sankt Augustin, DE

Key dates

Filing date	Mar 30, 2001
Grant date	May 31, 2005
Priority date	—
Expiry date	Mar 30, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C201/12
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to the preparation of nitrobenzoic acids by oxidizing particular nitrotoluenes, nitrobenzyl alcohols, esters and/or ethers in the presence of nitric acid at elevated temperature and elevated pressure. It has been found that the particular nitrotoluenes, nitrobenzyl alcohols, esters and/or ethers may be oxidized particularly reliably and in high yields using nitric acid to the benzoic acid derivatives when they are metered into the nitric acid.

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