Patent · US Expired

Process for the preparation of 2,4-dimethylpyrrole

US6166223A · kind A · utility

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8Claims

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Assignee

BASF SE

Inventors

Carsten Groning · Mannheim, DE
Reinhard Kemper · Heidelberg, DE
Markus Frede · Eppelheim, DE
Klaus Ebel · Lampertheim, DE

Key dates

Filing date	Dec 13, 1999
Grant date	Dec 26, 2000
Priority date	—
Expiry date	Dec 13, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D207/323
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the preparation of 2,4-dimethylpyrrole is described in which a 2,4-dimethyl-3,5-bisalkoxycarbonylpyrrole is refluxed with from 10 to 30% strength aqueous alkali metal hydroxide solution until the solid has passed into solution, the reaction mixture is neutralized with acid and the mixture is refluxed further until decarboxylation is complete. The process makes it possible to work under significantly milder, less aggressive conditions than are known from the prior art.

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