Cyclohexanone oxime methanesulfonate

The reaction in Part A proceeds in almost quantitative yield. Accordingly the crude cyclohexanone oxime methanesulfonate can be used without any purification. Prolonged standing at room temperature may cause serious decomposition. The crude material may be stored in a freezer, or as a dichloromethane solution In a refrigerator, and can be recrystallized from ether-hexane to give the white solid (mp 43-45°C)... 

Cyclohexanone oxime methanesulfonate Cyclohexanone, 0-(methylsulfonyl)oxime (10) (80053-69-6)... 

A. Cyatohexanone oxime methanesulfonate. A dry, 1-L, two-necked, round-bottomed flask is equipped with a gas inlet, rubber septum, and magnetic stirring bar. The flask is charged with 17.0 g (0.15 mol) of cyclohexanone oxime (Note 1) and flushed with argon, after which 300 mL of dichloromethane followed by 25 mL (0.18 mol) of triethylamine (Note 2) are injected through the septum into the flask. The solution is stirred and cooled to a temperature of -15 to -20°C in a dry ice-carbon tetrachloride bath, while 12.8 mL... 

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