Methyl iodide → 1,2,2,6,6-Pentamethyl-4-piperidone hydroiodide

Participants

Reaction Steps

A solution of 2,2,6,6-tetramethyl-4-piperidone monohydrate (40 g, 23.1 mmol) and methyl iodide (98.31 g, 69.3 mmol) in isopropyl alcohol (25 mL) was stirred at RT for 48 h. The resulting suspension was filtered, the solid residue was dried and recrystallized from MeOH. After filtration and repeated washings with MeOH the solid was dried giving pure title compound (31.6 g, 10.6 mmol, yield 46.0%) as pale brown crystals.

Provenance & Evidence