4-Chloro-3,5-dimethylphenol → 3-Chloro-6-hydroxy-2,4-dimethylbenzaldehyde

Temperatur

2 °C

A solution of 4-chloro-3,5-dimethylphenol (16 g, 0.1 mole) in dichloromethane (100 ml) was stirred and cooled to 2° C. in an ice bath. Titanium tetrachloride (35 g, 0.18 mole) was added dropwise over a period of 10 minutes and dichloromethylmethyl ether (11.5 g, 0.1 mole) was added slowly to the dark red solution, the temperature being kept below 10° C. throughout. After the solution had been stirred at 5° C. for 30 minutes the temperature was allowed to rise and to remain at 20° C. for 30 minutes. Finally the solution was warmed at 35° C. for 15 minutes and then poured into ice water (200 ml). The mixture was shaken vigorously until almost colourless and then the dichloromethane layer was separated and the aqueous phase was extracted with more dichloromethane (2×50 ml). The combined organic layers were washed with water thoroughly (4×200 ml) and then dried over anhydrous magnesium sulphate. The drying agent was removed by filtration and the filtrate was concentrated under reduced pressure using a rotary evaporator. The product, 3-chloro-6-hydroxy-2,4-dimethylbenzaldehyde was isolated as a white solid (13 g, 70%), mp 89°-90° C. Proton magnetic resonance spectrum (CDCl3 ; δ in ppm): 2.40 (3H, s); 2.64 (3H, s); 6.71 (1H, s); 10.23 (1H, s); 11.91 (1H, s).

1. custombeing kept below 10° C.
2. waitto remain at 20° C. for 30 minutes
3. temperatureFinally the solution was warmed at 35° C. for 15 minutes
4. customwas separated
5. extractionthe aqueous phase was extracted with more dichloromethane (2×50 ml)
6. washThe combined organic layers were washed with water thoroughly (4×200 ml)
7. dry with materialdried over anhydrous magnesium sulphate
8. customThe drying agent was removed by filtration
9. concentrationthe filtrate was concentrated under reduced pressure
10. customa rotary evaporator

ORD-Eintrag

ord-ef3e07b8975a4f0d84e32379eb18a967

Quelldatensatz

uspto-grants-1987_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04666510