Reaktion #50573

Reaktionsgleichung

3-chloro-2-methyl-phenoxy-acetamide oxime

sodium acetate

acetic anhydride

→

3-(3-chloro-2-methyl-phenoxymethyl)-5-methyl-1,2,4-oxadiazole

Ausbeute 56.6%

Lösungsmittel

diglyme

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturat reflux temperature until the reaction
2. 2
   Sonstige(approximately 2 hours)
3. 3
   EinengenThe entire batch is subsequently concentrated
4. 4
   workup.ADDITIONthe product is treated with water
5. 5
   Extraktionthe mixture is extracted
6. 6
   workup.DISTILLATIONAfter the solvent has been distilled off
7. 7
   Sonstigethe crude product which remains is chromatographed over a silica gel column (silica gel 60 Merck, particle size: 0.040 to 0.063 mm)

Vorschrift

7.0 g (32.6 mmol) of 3-chloro-2-methyl-phenoxy-acetamide oxime and 14.0 g (142.8 mmol) of sodium acetate are introduced into 80 ml of diglyme and the mixture is treated with 8.6 g (84.2 mmol) of acetic anhydride. The reaction mixture is stirred at reflux temperature until the reaction is complete (approximately 2 hours). The entire batch is subsequently concentrated, the product is treated with water, and the mixture is extracted using ethyl acetate. After the solvent has been distilled off, the crude product which remains is chromatographed over a silica gel column (silica gel 60 Merck, particle size: 0.040 to 0.063 mm) using methylene chloride as the eluent. 4.4 g (56.5% of theory) of 3-(3-chloro-2-methyl-phenoxymethyl)-5-methyl-1,2,4-oxadiazole are obtained.

Quelle