Reaktion #1103959

Reaktionsgleichung

2-ethylphenol

dichloromethyl methyl ether

HCl

HCl

→

3-Ethyl-4-hydroxy-benzaldehyde

Lösungsmittel

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigewas at 0° C
2. 2
   Temperatursubsequently cooled to 0° C.
3. 3
   workup.STIRRINGThe mixture was stirred for 10 min.
4. 4
   Extraktionsubsequently extracted with diethyl ether
5. 5
   WaschenThe organic phase was washed with saturated NaHCO3 solution and with NaCl solution
6. 6
   Sonstigedried
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated
9. 9
   SonstigeThe residue was purified by chromatography (SiO2, CH2Cl2=>CH2Cl2/MeOH 9:1)

Vorschrift

TiCl4 (45.6 g, 238 mmol) was added slowly to a solution of 2-ethylphenol (15 g, 119 mmol) in CH2Cl2 (150 ml) was at 0° C. The mixture was warmed to room temperature and dichloromethyl methyl ether (18.3 ml, 200 mmol) was added (strong HCl evolution). The mixture was stirred for 4 h. at room temperature, subsequently cooled to 0° C. and 1M HCl (119 ml, 119 mmol) was added dropwise. The mixture was stirred for 10 min. and subsequently extracted with diethyl ether. The organic phase was washed with saturated NaHCO3 solution and with NaCl solution, dried, filtered and concentrated. The residue was purified by chromatography (SiO2, CH2Cl2=>CH2Cl2/MeOH 9:1). 3-Ethyl-4-hydroxy-benzaldehyde was obtained as a brown oil (7.97 g, 45%).

Quelle