Sulfuric Acid → HCID 86625062, compound

Participants

Reaction Conditions

Reaction Steps

3-Hydroxy-2-methyl-cyclohex-2-enone (500 g, 3.96 mol) is added to a mechanically stirred reactor. To this is added methanol (1.35 L) followed by trimethyl orthoformate (1.65 L, 15.85 mol, 4 eq) and sulfuric acid (15 mL). The resulting mixture is stirred for 2 h until completion and hydroxylamine sulfate (275 g, 3.96 mol, 1 eq) is added as a solid. The mixture is heated to 40° C. and stirred at that temperature until complete conversion (2-2.5 h). The solution is then cooled to 5° C. and the pH is adjusted to 7 with saturated sodium bicarbonate (˜3 L). The precipitate formed is collected by filtration (filter 10 cm diameter, 1.5 cm cake thickness, <3 min total filtration time), rinsed with heptane (400 mL) and dried under nitrogen flow for 4-6 h to provide 560 g (92% yield) of 3-methoxy-2-methyl-cyclohex-2-enone oxime.

Provenance & Evidence