Degussa Aktiengesellschaft

Klaus Kohler

Gunter Prescher

Juan G Andrade

There is disclosed a process for the production of 1-methylcyclopropanecarboxaldehyde of the formula ##STR1## comprising treating 4-chloro-2-methyl-butanal of the formula ##STR2## at a temperature between -40.degree. and +7.degree. C. in an inert solvent with a 1.0 to 10.0 fold molar amount of a strong, non-nucleophilic base.

Process for the production of 1-methylcyclopropanecarboxaldehyde

4-chloro-butanals of the formula ##STR1## where R is hydrogen or a straight or branched chain alkyl group of 1 to 4 carbon atoms are produced by reacting the corresponding 1,1-dimethoxy-4-hydroxybutane at a temperature between -20.degree. and +80.degree. C. in the presence of triphenylphosphine with carbon tetrachloride and hydrolyzing the 1,1-dimethoxy-4-chloro-butane obtained in acid medium.

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Hainburg, Germany

Klaus Kohler