4-Cyanobenzaldehyde → 4-(2-Methoxyethenyl)benzonitrile

HRID 4874

Reaktionsgleichung

Reaktionsgleichung von HRID 4874
[Cl-].[CH3:2][O:3][CH2:4][P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.[C:24]([C:26]1[CH:33]=[CH:32][C:29]([CH:30]=O)=[CH:28][CH:27]=1)#[N:25]>COC(C)(C)C>[CH3:2][O:3][CH:4]=[CH:30][C:29]1[CH:32]=[CH:33][C:26]([C:24]#[N:25])=[CH:27][CH:28]=1

Komponenten

4

Edukt 2

HCID 660424-CyanobenzaldehydeHCID 2723798Methoxymethyl-triphenylphosphonium chloride

Produkt 1

HCID 536603324-(2-Methoxyethenyl)benzonitrile

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 15413tert-Butyl methyl etherLösungsmittel2×

Versuchsvorschrift

A suspension of 37.2 g of methoxymethyl-triphenylphosphonium chloride in 250 ml of t-butyl methyl ether is treated at room temperature while gassing with argon with 13.4 g of potassium t-butylate and stirred for 1 hour. Subsequently, the reaction mixture is treated at about 20° C. with a mixture of 9.49 g of 4-cyanobenzaldehyde and 100 mol of t-butyl methyl ether and stirred for a further 1 hours. Thereafter, the reaction mixture is partitioned in diethyl ether/water. The aqueous phase is extracted several times with diethyl ether. The organic phases are washed with water, dried over magnesium sulfate, filtered and evaporated. Chromatographic purification of the resulting crude product on silica gel with petroleum ether and toluene/hexane (vol. 3:1) gives 4-(2-methoxyvinyl)benzonitrile.

Aufarbeitung

  1. additionis treated at room temperature
  2. stirringstirred for a further 1 hours
  3. customThereafter, the reaction mixture is partitioned in diethyl ether/water
  4. extractionThe aqueous phase is extracted several times with diethyl ether
  5. washThe organic phases are washed with water
  6. dry with materialdried over magnesium sulfate
  7. filtrationfiltered
  8. customevaporated
  9. customChromatographic purification of the resulting crude product on silica gel with petroleum ether and toluene/hexane (vol. 3:1)

Quellen und Nachweise

ORD-Eintrag
ord-f5389a0b5ac54c3387a6aa94190a6c9c
Quelldatensatz
uspto-grants-1993_09
Patentnummer
US05242619

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