Boron tribromide → 5-Formyl-2,3-dihydroxybenzonitrile

HRID 2568

Reaktionsgleichung

Reaktionsgleichung von HRID 2568
[CH:1]([C:3]1[CH:4]=[C:5]([C:8]([OH:13])=[C:9]([O:11]C)[CH:10]=1)[C:6]#[N:7])=[O:2].B(Br)(Br)Br>ClCCl>[CH:1]([C:3]1[CH:4]=[C:5]([C:8]([OH:13])=[C:9]([OH:11])[CH:10]=1)[C:6]#[N:7])=[O:2]

Komponenten

4

Edukt 2

HCID 25134Boron tribromideHCID 18359065Benzonitrile, 5-formyl-2-hydroxy-3-methoxy-

Produkt 1

HCID 152925835-Formyl-2,3-dihydroxybenzonitrileAusbeute 72,4 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel2×

Reaktionsbedingungen

Temperatur
0 °C

Versuchsvorschrift

18 g of the product of Step A and 400 ml of dichloromethane were mixed together under nitrogen and the mixture was cooled to 0° C. 150 ml of a molar solution of boron tribromide in dichloromethane were added and the mixture stood for one night at ambient temperature. It was concentrated, cooled again to 0° C. and 250 ml of a normal solution of hydrochloric acid were added. The crystallized product was separated out, washed with water, dried then crystallized from an isopropanol--water mixture (1-2) to obtain 12 g of the expected product.

Aufarbeitung

  1. waitthe mixture stood for one night at ambient temperature
  2. concentrationIt was concentrated
  3. temperaturecooled again to 0° C.
  4. addition250 ml of a normal solution of hydrochloric acid were added
  5. customThe crystallized product was separated out
  6. washwashed with water
  7. customdried
  8. customthen crystallized from an isopropanol

Quellen und Nachweise

ORD-Eintrag
ord-8ff9fcd9cfe74e8dbd93a16959bf292e
Quelldatensatz
uspto-grants-1998_03
Patentnummer
US05728828

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