CH192015A - Process for the preparation of a lactonic ester with an unsaturated side chain. - Google Patents

Process for the preparation of a lactonic ester with an unsaturated side chain.

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Publication number
CH192015A
CH192015A CH192015DA CH192015A CH 192015 A CH192015 A CH 192015A CH 192015D A CH192015D A CH 192015DA CH 192015 A CH192015 A CH 192015A
Authority
CH
Switzerland
Prior art keywords
ester
lactonic
side chain
preparation
unsaturated side
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft Heine & Co.
Original Assignee
Heine & Co Ag
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
Application filed by Heine & Co Ag filed Critical Heine & Co Ag
Publication of CH192015A publication Critical patent/CH192015A/en

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

Description

       

  Verfahren zur Herstellung eines     Eaktonesters    mit einer ungesättigten     Seitenkette.       Das Hauptpatent     betrifft    ein Verfahren  zur Herstellung des     r-Laktons    der     a-Pentenyl-          P-methyl-p-oxyadipinäthylestersäure    durch  Kondensation eines     Lävulinsäureesters    mit  <I>a,</I>     r,        8-Tribrom-n-heptylsäure-äthylester    in  Gegenwart eines     Metalles.     



  Es zeigte sich, dass man ein Produkt er  hält, welches dem Endprodukt des Haupt  patentverfahrens ähnlich ist, wenn man an  Stelle des dort verwendeten     Tribromfettsäure-          esters    den a,     d,        e-Tribrom-n-caprylsäure-äthyl-          ester    verwendet.  



  Das so erhaltene Produkt ist neu und  stellt das     r-Lakton    der     a-Hexenyl-R-methyl-          P-oxyadipinäthylestersäure    dar. Es bildet ein  gelbes, geruchloses Öl vom     Kpä    =175-190    und     dis    = 1,045 bis 1,050. Es soll zur Her  stellung von     3-Methyl-2(hexen-3-yl)-cyclo-          penten-2-on-1    dienen, welches als     Riechstoff     Verwendung findet.  



  <I>Beispiel:</I>  Zu einem Gemisch von 130 g     Lävulin-          ester,    270 cm' trockenem Benzol und 133 g    mit Jod aktivierten Zinkspänen lässt man  unter Rühren beim Kochpunkt des Gemisches  367 g a,     a,        e-Tribrom-n-caprylsäure-äthylester     so zulaufen, dass die Reaktion im Gange  bleibt, hält nach beendeter Zugabe noch eine  Stunde länger im Sieden und arbeitet auf,  indem man abkühlt, Schwefelsäure unter Zu  satz von Eis hinzufügt, mit Benzol extrahiert,  wäscht, das Benzol abtreibt und den Rück  stand im Vakuum fraktioniert.  



  Man erhält in befriedigender Ausbeute  das     r-Lakton    der     a-Hexenyl-,Q-methyl-p-oxy-          adipinäthylestersäure.    Gelbes geruchloses Öl  vom     gp6    = 175-190<B>0</B>, d<B>16</B>     ,=    1,045-1,050.  



  An Stelle von Benzol kann auch trockener  Äther verwendet werden.



  Process for the preparation of an aktone ester with an unsaturated side chain. The main patent relates to a process for the preparation of the r-lactone of a-pentenyl-P-methyl-p-oxyadipinethyl ester by condensation of a levulinic acid ester with 8-tribromo-n-heptylic acid ethyl ester in the presence of a metal.



  It turned out that a product is obtained which is similar to the end product of the main patent process if the a, d, e-tribromo-n-caprylic acid ethyl ester is used instead of the tribromofatty acid ester used there.



  The product obtained in this way is new and represents the r-lactone of a-hexenyl-R-methyl-P-oxyadipin ethyl ester acid. It forms a yellow, odorless oil with a Kpä = 175-190 and dis = 1.045 to 1.050. It is intended to produce 3-methyl-2 (hexen-3-yl) -cyclo- penten-2-one-1, which is used as a fragrance.



  <I> Example: </I> To a mixture of 130 g of levulin ester, 270 cm 'of dry benzene and 133 g of zinc shavings activated with iodine, add 367 ga, a, e-tribromine-n- while stirring at the boiling point of the mixture. ethyl caprylate in such a way that the reaction continues, keeps boiling for an hour longer after the addition and works by cooling, adding sulfuric acid with the addition of ice, extracting with benzene, washing, driving off the benzene and the The residue was fractionated in vacuo.



  The r-lactone of a-hexenyl, Q-methyl-p-oxy-adipic ethyl ester acid is obtained in a satisfactory yield. Yellow odorless oil from gp6 = 175-190 <B> 0 </B>, d <B> 16 </B>, = 1.045-1.050.



  Instead of benzene, dry ether can also be used.


    

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Lakton- esters mit einer ungesättigten Seitenkette, dadurch gekennzeichnet, dass man a, ö, a- Tribrom-n-caprylsäure-äthylester mit einem Lävulinsäureester in Gegenwart eines Me tallei kondensiert. Der erhaltene Ester ist das r-Lakton der a-Hegenyl-p-methyl-p-oxy- adipinäthylestersäure; es bildet ein gelbes, geruchloses<B>01</B> vom Kps = 175-190' und dls = 1,045-1,050. UNTERANSPRüCHE 1. Claim: Process for the production of a lactonic ester with an unsaturated side chain, characterized in that a, δ, a-tribromo-n-caprylic acid ethyl ester is condensed with a levulinic acid ester in the presence of a metallei. The ester obtained is the r-lactone of a-Hegenyl-p-methyl-p-oxy-adipic ethyl ester acid; it forms a yellow, odorless <B> 01 </B> of Kps = 175-190 'and dls = 1.045-1.050. SUBCLAIMS 1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass als Metall Zink ver wendet wird. 2. Verfahren nach Patentanspruch und Un teranspruch 1, dadurch gekennzeichnet, dass bei Siedetemperatur gearbeitet wird, wobei das Sieden nach beendigter Zugabe des Zinkes wenigstens eine Stunde auf recht erhalten wird. 3. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass in trockenem Benzol gearbeitet wird. 4. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass in trockenem Äther gearbeitet wird. Method according to claim, characterized in that zinc is used as the metal. 2. The method according to patent claim and un teran claim 1, characterized in that it is carried out at boiling temperature, the boiling being maintained for at least one hour after the addition of the zinc is complete. 3. The method according to claim, characterized in that it is carried out in dry benzene. 4. The method according to claim, characterized in that it is carried out in dry ether.
CH192015D 1934-12-22 1935-03-23 Process for the preparation of a lactonic ester with an unsaturated side chain. CH192015A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE192015X 1934-12-22
CH186538T 1935-03-23

Publications (1)

Publication Number Publication Date
CH192015A true CH192015A (en) 1937-07-15

Family

ID=25721364

Family Applications (1)

Application Number Title Priority Date Filing Date
CH192015D CH192015A (en) 1934-12-22 1935-03-23 Process for the preparation of a lactonic ester with an unsaturated side chain.

Country Status (1)

Country Link
CH (1) CH192015A (en)

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