Reaktion #71007

Reaktionsgleichung

1-(2,2,4-trimethyl-cyclohex-3-enyl)-ethanone

pyridine

methoxyamine hydrochloride

→

1-(2,2,4-trimethyl-cyclohex-3-enyl)-ethanone O-methyl-oxime

Ausbeute 92.4%

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeMethanol was removed under reduced pressure
2. 2
   workup.ADDITIONthe residue poured in water (600 ml)
3. 3
   workup.ADDITION1N hydrochloric acid was added (100 ml)
4. 4
   ExtraktionThe solution was extracted with dichloromethane (3×300 ml)
5. 5
   WaschenCombined organic layers were washed with brine (500 ml)
6. 6
   Trocknendried over sodium sulfate
7. 7
   SonstigeThe solvent was removed in vacuo

Vorschrift

To a stirred solution of 1-(2,2,4-trimethyl-cyclohex-3-enyl)-ethanone (162 g; 0.97 mol), prepared as described in example P4, in methanol (500 ml) was added pyridine (160 ml; 1.95 mol) followed by a portionwise addition of methoxyamine hydrochloride (142 g; 1.70 mol). The reaction mixture was stirred at 24° C. for 16 hours under nitrogen atmosphere. Methanol was removed under reduced pressure, the residue poured in water (600 ml) and 1N hydrochloric acid was added (100 ml). The solution was extracted with dichloromethane (3×300 ml). Combined organic layers were washed with brine (500 ml) and dried over sodium sulfate. The solvent was removed in vacuo to afford 175 g (92% of theory) of 1-(2,2,4-trimethyl-cyclohex-3-enyl)-ethanone O-methyl-oxime as a clear red oil.

Quelle