Preparation of enol ethers

US6504064B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Jochem Henkelmann · Mannheim, DE
• Heike Becker · Mannheim, DE
• Juan Aiscar · Mannheim, DE
• Boris A. Trofimov · Wau, SS
• Nina K. Gusarova · Seoul, KR
• Ludmilla A. Oparina · Irkutsk, RU

Key dates

• Filing date: Jun 21, 2001
• Grant date: Jan 7, 2003
• Expiry date: Jun 21, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C41/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Enol ethers of the formula (I) where R1 to R3 are each, independently of one another, hydrogen or a carbon-containing organic radical and R4 is an unsubstituted or substituted alkyl radical, are prepared by reacting alcohols of the formula (II)R4—OH  (II),with alkynes of the formula (IlIa), alkadienes of the formula (IIIb)R1—C≡C—CHR2R3  (IIIa),R1—CH═C═CR2R3  (IIIb)or mixtures thereof, where R1 to R4 are as defined above, in the presence of an alkali metal alkoxide and a polar, aprotic solvent.