Isomerization of β-keto-allenes

US8802898B2 · kind B2 · utility

Assignee

• DSM IP ASSETS B.V. · NL

Inventors

• Werner Bonrath · Kaiseraugst, CH
• Reinhard Karge · Staufen, DE
• Thomas Netscher · Bad Krozingen, DE
• Yann Pressel · Rixheim, FR

Key dates

• Filing date: Apr 18, 2011
• Grant date: Aug 12, 2014
• Expiry date: Jul 29, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2231/52
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Isomerization of β-keto-allenes of the general formula I wherein R1 is hydrogen, methyl or ethyl, in particular hydrogen or methyl; R2 is hydrogen or methyl; R3 is hydrogen or methyl, in particular methyl and R4 is an aliphatic hydrocarbon residue containing 1-37 carbon atoms, into corresponding α,γ-dienones of formula II by treatment with a basic ion exchange resin.