Water → 2-Cyano-3-(2,6-dichlorophenyl)acrylic acid

HRID 1026621Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1026621
[Cl:1][C:2]1[CH:9]=[CH:8][CH:7]=[C:6]([Cl:10])[C:3]=1[CH:4]=O.[C:11]([CH2:13][C:14]([OH:16])=[O:15])#[N:12].C([O-])(=O)C.[NH4+].N1C=CC=CC=1.O>C1(C)C=CC=CC=1>[C:11]([C:13](=[CH:4][C:3]1[C:2]([Cl:1])=[CH:9][CH:8]=[CH:7][C:6]=1[Cl:10])[C:14]([OH:16])=[O:15])#[N:12]

Komponenten

7

Edukt 5

HCID 962WaterHCID 1049PyridineHCID 67372,6-DichlorobenzaldehydeHCID 9740Cyanoacetic acidHCID 517165Ammonium Acetate

Produkt 1

HCID 545137902-Cyano-3-(2,6-dichlorophenyl)acrylic acidAusbeute 4,9 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1140TolueneLösungsmittel

Versuchsvorschrift

A stirred mixture of 2,6-dichlorobenzaldehyde (609 mmol, 106.5 g), cyanoacetic acid (609 mmol, 51.8 g), ammonium acetate (122 mmol, 9.38 g), pyridine (1065 mmol, 86 ml, 84 g) and toluene (468 ml) was stirred at reflux using a Dean-Stark apparatus until one equivalent of water was collected (NB Oil bath temperature should not exceed 120° C. to avoid decarboxylation at this stage—lag Dean-Stark well). The reaction mixture was allowed to cool and the solid precipitate filtered and stirred with 10% aqueous HCl. The solid was again collected by filtering to afford pure 2-cyano-3-(2,6-dichlorophenyl)acrylic acid (7.21 g). The filtrate was concentrated in vacuo to give the crude 2-cyano-3-(2,6-dichlorophenyl)acrylic acid (˜135 g). Recrystallisation from toluene afforded pure 2-cyano-3-(2,6-dichlorophenyl)acrylic acid (101 g).

Aufarbeitung

  1. temperatureat reflux
  2. customwas collected (NB Oil bath temperature should not
  3. customexceed 120° C.
  4. temperatureto cool
  5. filtrationthe solid precipitate filtered
  6. stirringstirred with 10% aqueous HCl
  7. customThe solid was again collected
  8. filtrationby filtering

Quellen und Nachweise

ORD-Eintrag
ord-dbd9923988d24681bb3fe0c241e318cb
Quelldatensatz
uspto-grants-2014_05
Patentnummer
US08729274B2

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