Acetylketene dialkyl acetals and a process for their preparation

US4825008A · kind A · utility

Assignee

• Hoescht Aktiengesellschaft · DE

Inventors

• Klaus Gunther · Voerde, DE
• Gunter Mau · Kelkheim, DE

Key dates

• Filing date: Dec 28, 1987
• Grant date: Apr 25, 1989
• Expiry date: Dec 28, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/82
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of acetylketene dialkyl acetals of the formula CH.sub.3 CO--CH.dbd.C(OR.sup.2).sub.2 in which R.sup.2 can be an alkyl radical with 1 to 12 carbon atoms, and also these compounds themselves, providing that R.sup.2 is an alkyl radical with 3 to 12 carbon atoms. In the preparation process an alkyl acetoacetate of the formula CH.sub.3 CO--CH.sub.2 COOR.sup.1 is reacted with a saturated primary or secondary alcohol R.sup.2 OH in the presence of an acid catalyst, in which R.sup.2 has the abovementioned meaning and in which R.sup.2 OH or is higher boiling than R.sup.1 OH.