3-Methyl-2-butenoic acid → 4,8-Dimethylnona-3,7-dien-2-one

HRID 1580178

Reaktionsgleichung

Reaktionsgleichung von HRID 1580178
C([O:4][C:5](=[CH:7][C:8]([CH3:10])=[CH2:9])[CH3:6])(=O)C.[CH3:11][C:12]([CH3:16])=[CH:13][CH2:14]O.CC(C)=CC(O)=O>C(O)(=O)C>[CH3:6][C:5]([CH2:4][CH2:14][CH:13]=[C:12]([CH3:16])[CH3:11])=[CH:7][C:8](=[O:9])[CH3:10]

Komponenten

5

Edukt 3

HCID 109313-Methyl-2-butenoic acidHCID 111733-Methyl-2-buten-1-OLHCID 545555184-Methyl-2,4-pentadien-2-yl acetate

Produkt 1

HCID 5496634,8-Dimethylnona-3,7-dien-2-oneAusbeute 86 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 176Acetic AcidLösungsmittel

Versuchsvorschrift

110 parts of 4-methyl-2,4-pentadien-2-yl acetate and 60 parts of prenol are heated with 1.4 parts of 3,3-dimethylacrylic acid at about 180°C for 4 hours in a small pressure column at a pressure of 2 atmospheres, the acetic acid formed being distilled off continuously. Fractional distillation of the reaction product gives 61.8 parts of 4,8-dimethyl-3,7-nonadien-2-one (yield 86% of theory, conversion 62% based on prenol).

Aufarbeitung

  1. distillationbeing distilled off continuously
  2. distillationFractional distillation of the reaction product

Quellen und Nachweise

ORD-Eintrag
ord-272906040c7b45019dc23071b435746f
Quelldatensatz
uspto-grants-1976_01
Patentnummer
US03932462

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