AT60761B - Process for the preparation of β-γ-dimethylbutadiene. - Google Patents

Process for the preparation of β-γ-dimethylbutadiene.

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Publication number
AT60761B
AT60761B AT60761DA AT60761B AT 60761 B AT60761 B AT 60761B AT 60761D A AT60761D A AT 60761DA AT 60761 B AT60761 B AT 60761B
Authority
AT
Austria
Prior art keywords
dimethylbutadiene
preparation
acidic
pinacon
desc
Prior art date
Application number
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German (de)
Original Assignee
Farbenfab Vorm Bayer F & Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application granted granted Critical
Publication of AT60761B publication Critical patent/AT60761B/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Darstellung   von ss-y-Dtmethytbutadien.   



   Durch das Stammpatent Nr.   56385   ist ein Verfahren zur Darstellung von   p Dimethyl-   butadien geschützt, welches darin besteht, dass man Pinakou mit sauren Salzen der Schwefelsäure destilliert. 



   Es wurde nun gefunden, dass man auch neutrale, sauer reagierende Sulfate, wie gewöhnlichen Alaun, Eisenalaun, Chromalaun, Kupfersulfat, Eisensulfat, Aluminiumsulfat usw. zu dieser Reaktion verwenden kann. Hiebei ist die Ausbeute an   ss-y-Dimethylbutadien   sogar noch besser als nach dem Verfahren des Stammpatentes. Auch ist die Anwendung neutraler, leicht zu reinigender Salze technisch einfacher. 



   Beispiel. 



   1000 Teile Pinakon werden mit 100 Teilen gewöhnlichem Alaun im Destillationapparat auf 1400 C erhitzt. Es destillieren   Rtwas unverändertes Pinakon, Wasser und   Pinakolin und   des ss-#-Dimethylbutadien über. Letzteres   wird durch fraktionierte   Destillation   gereinigt. Die Ausbeute beträgt etwa 77% der Theorie. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Process for the preparation of ss-y-Dtmethytbutadiene.



   The parent patent no. 56385 protects a process for the preparation of p-dimethylbutadiene, which consists in distilling Pinakou with acidic salts of sulfuric acid.



   It has now been found that neutral, acidic sulfates, such as common alum, iron alum, chrome alum, copper sulfate, iron sulfate, aluminum sulfate, etc., can be used for this reaction. The yield of ss-γ-dimethylbutadiene is even better than that obtained with the process of the parent patent. The use of neutral, easy-to-clean salts is also technically easier.



   Example.



   1000 parts of pinacon are heated to 1400 ° C. with 100 parts of ordinary alum in a distillation apparatus. Somewhat unchanged pinacon, water and pinacolin and the ss - # - dimethylbutadiene distill over. The latter is purified by fractional distillation. The yield is about 77% of theory.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Abänderung des durch das Stammpatent Nr. 56385 geschützten Verfahrens zur Darstellung von ss-Y-Dimethylbutadien, dadurch gekennzeichnet, dass man zur Überführung von Pinakon in das Dimethylbutadien an Stelle der sauren Salze der Schwefelsäure sauer reagierende, neutrale Sulfate verwendet. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Modification of the process for the preparation of ss-Y-dimethylbutadiene, which is protected by the parent patent No. 56385, characterized in that acidic, neutral sulfates are used instead of the acidic salts of sulfuric acid to convert pinacon into dimethylbutadiene. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT60761D 1910-02-17 1912-06-22 Process for the preparation of β-γ-dimethylbutadiene. AT60761B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE56385X 1910-02-17
DE60761X 1911-07-28

Publications (1)

Publication Number Publication Date
AT60761B true AT60761B (en) 1913-08-25

Family

ID=25749241

Family Applications (1)

Application Number Title Priority Date Filing Date
AT60761D AT60761B (en) 1910-02-17 1912-06-22 Process for the preparation of β-γ-dimethylbutadiene.

Country Status (1)

Country Link
AT (1) AT60761B (en)

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