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US 3,940,445 AGranted
Production of 2-methyl-4-halobut-2-en-1-als
AssigneeBadische Anilin- & Soda-Fabrik Aktiengesellschaft
InventorsWerner Reif, Roman Fischer, Horst Pommer
Life of this patent
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Abstract
A process for the production of 2-methyl-4-halobut-2-en-1-als by reacting 2-methylbut-3-en-1-al-2-ol or an acetal or acylate thereof at a temperature of from -10.degree.C to +100.degree.C in the presence of copper or a copper salt with the appropriate hydrogen halides.
Claims9
A process for the production of a 2-methyl-4-halobut-2-en-1-al having the formula O=CH--C(CH.sub.3)=CH--CH.sub.2 --Hal where Hal denotes chlorine or bromine by reacting at a temperature in the range of -10.degree.C. to +100.degree.C. in a reaction mixture consisting essentially of
- A. a compound selected from the group consisting of 2-methylbut-3-en-1-al-2-ol, diacetals thereof of alkanols having one to four carbon atoms, acetals thereof of alkanediols having two to four carbon atoms and acylates thereof of monocarboxylic acids having two to four carbon atoms;
- with
- B. a hydrogen halide selected from the group consisting of hydrogen chloride and hydrogen bromide in the form of a concentrated aqueous solution of said hydrogen halide, and
- C. in the presence of finely divided copper or a copper salt.
1 more element
Dependencies are inferred from the claim text.