Reaktion #939650

Reaktionsgleichung

ethyl acetate hexane

Benzoyl chloride

Para-formaldehyde

para-formaldehyde

→

desired product

Benzoic Acid Chloromethyl Ester

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas heated to 55° C. for 10 hours
2. 2
   Temperaturcooled
3. 3
   Sonstigeflash chromatographed on 500 g silica gel
4. 4
   Wascheneluting with a solvent mixture of 2% ethyl acetate and 98% hexane
5. 5
   SonstigeThe solvent was evaporated in vacuo
6. 6
   Sonstigewas not above 35° C

Vorschrift

Para-formaldehyde (4.5 g) and zinc chloride (catalytic amount) were mixed together at 0° C. Benzoyl chloride (0.142 mole, 20 g) was added dropwise over 1 hour. The reaction was warmed to ambient temperature, then was heated to 55° C. for 10 hours. The progress of the reaction was followed by TLC (silica gel, 5/95, ethyl acetate/hexane). Since the starting material was still seen, an additional 1 g para-formaldehyde was added. The reaction was continued stirring at 55° C. for an additional 10 hours, cooled and flash chromatographed on 500 g silica gel, eluting with a solvent mixture of 2% ethyl acetate and 98% hexane. The solvent was evaporated in vacuo. Since the product had a low boiling point, the rotovapor bath temperature was not above 35° C. The desired product, 11.82 g (49%) was obtained as clear oil. MS (ES+): m/e 171 (M+H).

Quelle