Patent · US Expired

Process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one

US5994589A · kind A · utility

0Cited by

3References

7Claims

0Family size

Assignee

BASF SE

Inventors

Detlef Ruff · Ludwigshafen, DE
Wolfram Burst · Mannheim, DE
Wulf Kaiser · Bad Dürkheim, DE
Manfred Stroezel · Ilvesheim, DE

Key dates

Filing date	Mar 10, 1999
Grant date	Nov 30, 1999
Priority date	—
Expiry date	Mar 10, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C45/74
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one by reacting diethyl ketone with crotonaldehyde or a compound which is converted under the chosen reaction conditions into crotonaldehyde, in the presence of basic agents at elevated temperature, which comprises PA1 a) simultaneously pumping one mole of crotonaldehyde or one mole of a compound which is converted under the reaction conditions into crotonaldehyde, about 5 to 30 moles of diethyl ketone and the aqueous solution or suspension of a strong base, through separate lines or at least partly in the form of a suitable mixture, continuously into a pressure vessel, which is heated where appropriate and which ensures vigorous mixing, in such a way that PA1 b) the reaction temperature is between 150.degree. C. and 350.degree. C., and the average residence time in the pressure vessel is only about 0.1 second to 20 minutes.

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