1936
DOI: 10.1002/cber.19360690736
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Über einen neuen Weg zum Aufbau von Polyenen; Synthese der Hexatrien‐1.6‐ und Octatetraen‐1.8‐dicarbonsäure

Abstract: Wiihrend die Diphenyl-polyene H,C,,-(CH =CH),--C,H, bereits vor 9 Jahren bis zu n = 8 aufgebaut werden konnten'), hart die Kenntnis der entsprechendcn Dicarbomiiuren HOOC-(CH =CH) , , -O H bei der Muconsaure mit n = 2 a d . Die Synthese hoherer Glider, namentlich solcher, die noch seitenstbdige Methylgruppen tragen, erscheint wichtig, da Verbindungen dieser Art ,beim stufenweisen Abbau des Lycopinsa) und des p-CarotinsS) erhalten sowie als natiirliche Polyenfarbstoffe (Bixin, Crocetin) bekannt geworden sind, u… Show more

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Cited by 23 publications
(3 citation statements)
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“…Difficulties (I) CH3CH=CHCH=CHCHO,hexadienal (II) CH3CH=CHCH=CHCH=CHCHO,octatrienal (III) CH3CH=CHCH=CHCH=CHCH=CHCHO,decatetraenal CHCH=CHCH=CHCHO, eicosanonaenal encountered with pure crotonaldehyde led to the discovery that secondary amines themselves are not the catalyst proper in these condensations, but that they must first form salts with the traces of crotonic acid usually present in crotonaldehyde (59). To achieve uniform results the addition of acetic acid has become customary (20,62,87). Cyclization occurs as an undesirable side reaction, resulting in the formation of dihydro-o-tolualdehyde (IX) (5,20).…”
Section: Acetaldehyde and Crotonaldehyde Condensationsmentioning
confidence: 99%
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“…Difficulties (I) CH3CH=CHCH=CHCHO,hexadienal (II) CH3CH=CHCH=CHCH=CHCHO,octatrienal (III) CH3CH=CHCH=CHCH=CHCH=CHCHO,decatetraenal CHCH=CHCH=CHCHO, eicosanonaenal encountered with pure crotonaldehyde led to the discovery that secondary amines themselves are not the catalyst proper in these condensations, but that they must first form salts with the traces of crotonic acid usually present in crotonaldehyde (59). To achieve uniform results the addition of acetic acid has become customary (20,62,87). Cyclization occurs as an undesirable side reaction, resulting in the formation of dihydro-o-tolualdehyde (IX) (5,20).…”
Section: Acetaldehyde and Crotonaldehyde Condensationsmentioning
confidence: 99%
“…The next homolog of this series was prepared with ethyl sórbate (7). Rubidium ethylate has been recommended for these condensations, but the condensation of the higher members of the series requires the presence of pyridine (29,62,63,64). The resulting oxalopolyenic esters, when treated with acetic anhydride, yield the acetyl derivatives of their enol forms (XLIX).…”
Section: Hooccoch2(ch=ch)"cooh XLVIIImentioning
confidence: 99%
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