Preparation of 5-(2,2-dihalovinyl)-4,4-dialkyl-tetrahydro-furan-2-ones

US4324725A · kind A · utility

Assignee

• BASF SE

Inventors

• Rudolf Kropp · Schifferstadt, DE
• Martin Fischer · Ludwigshafen, DE
• Klaus Halbritter · Heidelberg, DE

Key dates

• Filing date: Aug 14, 1980
• Grant date: Apr 13, 1982
• Expiry date: Aug 14, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D307/30
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Preparation of 5-(2,2-dihalovinyl)-4,4-dialkyl-tetrahydro-furan-2-ones of the formula I ##STR1## where R.sup.1 and R.sup.2 are each alkyl of 1 to 4 carbon atoms and X is halogen, by reacting a carboxylic acid amide of the formula II ##STR2## where R.sup.3 and R.sup.4 are each alkyl of 1 to 4 carbon atoms, aralkyl of 7 to 9 carbon atoms or aryl of 6 to 10 carbon atoms, or together with the nitrogen form a 5-membered or 6-membered saturated ring which may contain a second hetero-atom, with a carbon tetrahalide of the formula III EQU CX.sub.4 (III) to give an iminium salt of the formula IV ##STR3## and then hydrolyzing the iminium salt; and novel iminium salts of the formula IV.