Water → 3-Benzoyloxy-4-chlorobenzyl bromide

HRID 901154

Reaktionsgleichung

Reaktionsgleichung von HRID 901154
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[CH:4][C:3]=1[O:9][C:10](=[O:17])[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.[Br:18]N1C(=O)CCC1=O.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1.O>C(Cl)(Cl)(Cl)Cl.C(OCC)C>[Br:18][CH2:8][C:5]1[CH:6]=[CH:7][C:2]([Cl:1])=[C:3]([O:9][C:10](=[O:17])[C:11]2[CH:12]=[CH:13][CH:14]=[CH:15][CH:16]=2)[CH:4]=1

Komponenten

7

Edukt 4

HCID 962WaterHCID 7187Benzoyl PeroxideHCID 67184N-bromobutanimideHCID 167492223-Benzoyloxy-4-chlorotoluene

Produkt 1

HCID 167478403-Benzoyloxy-4-chlorobenzyl bromide

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 3283Diethyl EtherLösungsmittelHCID 5943Carbon TetrachlorideLösungsmittel

Versuchsvorschrift

A mixture of benzoic acid 2-chloro-5-methyl-phenyl ester (CAB02124, 2.47 g, 10.0 mmol), N-bromo-succinimide (1.96 g, 11.0 mmol) and dibenzoyl peroxide (10 mg) in carbon tetrachloride (25 mL) was heated to reflux for 1 hour (TLC-control). After cooling to room temperature water (50 mL) and diethyl ether (100 mL) were added. The organic layer was separated, washed with brine (20 mL), dried over sodium sulphate and concentrated under reduced pressure. The residue was purified by column chromatography (EtOAc:hexane, 1:40, Rf: 0.21). Yield: 2.012 g (62%) colourless oil, which solidified after a few hours (contains ca. 10% benzoic acid 5-dibromomethyl-2-chloro-phenyl ester).

Aufarbeitung

  1. temperaturewas heated
  2. temperatureto reflux for 1 hour (TLC-control)
  3. additionwere added
  4. customThe organic layer was separated
  5. washwashed with brine (20 mL)
  6. dry with materialdried over sodium sulphate
  7. concentrationconcentrated under reduced pressure
  8. customThe residue was purified by column chromatography (EtOAc:hexane, 1:40, Rf: 0.21)
  9. waitYield: 2.012 g (62%) colourless oil, which solidified after a few hours

Quellen und Nachweise

ORD-Eintrag
ord-4579a21d5d1c450ab350e72cee382f06
Quelldatensatz
uspto-grants-2008_04
Patentnummer
US07361677B2

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