Verfahren zur Herstellung von 4-Chlor- oder 4-Brom-2-formylbuten-(2) oder deren Acetalen oder Acylaten

4 - Chloro - and - bromo - 2 - formylbutene-(2) or acetals and acylates thereof are produced by treating 2-formyl-2-hydroxybutene-(3) or its acetals or acylates with thionyl chloride, thionyl bromide or phosgene in the presence of N,N-dialkyl substituted amides of low molecular weight fatty acids, i...

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Bibliographic Details
Main Authors FREYSCHLAG,HERWIG,DR, REIF,WERNER,DR, POMMER,HORST,DR
Format Patent
LanguageGerman
Published 15.10.1966
Edition1
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:4 - Chloro - and - bromo - 2 - formylbutene-(2) or acetals and acylates thereof are produced by treating 2-formyl-2-hydroxybutene-(3) or its acetals or acylates with thionyl chloride, thionyl bromide or phosgene in the presence of N,N-dialkyl substituted amides of low molecular weight fatty acids, including compound in which the N alkyl groups are connected to each other direct or via oxygen, or N-alkyl substituted lactams, optionally in the presence of anhydrous solvents when a concentration of 0.01 mol of the amide relative to the formyl-hydroxybutene is preferred. 2 - Formyl - 2 - hydroxybutene - (3) is prepared by hydrogenation, by the process of Specification 871,804, of 2 - formyl - 2 - hydroxybutyne-(3), itself obtained by reacting methylglyoxal acetal with acetylene. It is stated that the compounds prepared by the process of the invention find use in the preparation of the corresponding 4-hydroxy-2-formyl-butene-(2) compounds.
Bibliography:Application Number: CH19630006436