Preparation of 4-monoacetals of 2-methylbut-2-ene-1,4-dial

US4804786A · kind A · utility

Assignee

• BASF SE

Inventors

• Rolf Fischer · Heidelberg, DE
• Bernhard Schulz · Schwetzingen, DE

Key dates

• Filing date: Jan 16, 1987
• Grant date: Feb 14, 1989
• Expiry date: Jan 16, 2007

Classification

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

Abstract

4-Monoacetals of (E)-2-methylbut-2-ene-1,4-dial of the general formula I ##STR1## where R.sup.1 and R.sup.2 are each an aliphatic hydrocarbon radical of 1 to 12 carbon atoms, cycloalkyl of 5 to 7 carbon atoms or benzyl, or R.sup.1 and R.sup.2 together form an ethylene or propylene radical which may furthermore be substituted by lower alkyl, are prepared by a process in which a compound of the general formula II ##STR2## where either R.sup.3 and R.sup.4 are both one of the groups ##STR3## where R.sup.1 and R.sup.2 have the above meanings, or R.sup.3 is one of the groups ##STR4## and R.sup.4 is formyl ##STR5## is reacted, at from 20.degree. to 200.degree. C., in the presence of an acidic compound, with the compound of the formula III EQU R.sup.5 --OH (III) where R.sup.5 is hydrogen, alkyl of 1 to 12 carbon atoms or hydroxyalkyl of 2 to 5 carbon atoms, and, where R.sup.3 and R.sup.4 are each ##STR6## R.sup.5 is alkyl, and where R.sup.3 and R.sup.4 are each ##STR7## R.sup.5 is hydrogen, and where R.sup.3 is ##STR8## and R.sup.4 is ##STR9## R.sup.5 is hydrogen and/or alkyl.