Process for preparing 2,7-dimethyl-2,4,6-octatrienal monoacetals

US6610892B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Hansgeorg Ernst · Speyer, DE
• Klaus Henrich · Haßloch, DE

Key dates

• Filing date: Mar 12, 2002
• Grant date: Aug 26, 2003
• Expiry date: Mar 12, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D319/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing 2,7-dimethyl-2,4,6-octatrienal monoacetals of the general formula I which comprisesa) condensing an ester phosphonium salt of the general formula II or an ester phosphonate of the general formula III with an aldehyde of the formula IV in a Wittig or Wittig-Horner reaction to give an acetal ester of the general formula V b) reducing the ester of the formula V to give an acetal alcohol of the general formula VI andc) oxidizing the alcohol to 2,7-dimethyl-2,4,6-octatrienal monoacetals of the general formula I, where the substituents have the meaning defined in the description.