Patent · US Expired

Preparation of cyclopentenones

US6828464B2 · kind B2 · utility

2Cited by

2References

6Claims

0Family size

Assignee

BASF SE

Inventors

Shelue Liang · Ludwigshafen, DE
Rolf Fischer · Heidelberg, DE
Sylvia Huber-Dirr · Zwingenberg, DE
Andrea Haunert · Mannheim, DE

Key dates

Filing date	Nov 24, 2003
Grant date	Dec 7, 2004
Priority date	—
Expiry date	Nov 24, 2023

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/582
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention provides a process for preparing 2-cyclopentenones of the general formula: where R1 to R4 are each hydrogen atoms or are alkyl or alkenyl radicals having from 1 to 12 carbon atoms, cycloalkyl or cycloalkenyl radicals having from 5 to 7 carbon atoms, aralkylene or aryl radicals, by converting hexenedioic acids and/or their esters of the general formulae where R1 to R4 are each as defined above and R5 and R6 are each hydrogen atoms or are alkyl radicals having from 1 to 12 carbon atoms, cycloalkyl radicals having 5 or 6 carbon atoms, aralkyl or aryl radicals, at temperatures of from 150 to 450° C., over solid, oxidic catalysts, wherein the catalysts on an oxidic support material comprise from 0.01 to 5% by weight of at least one alkali metal oxide.

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