[C:1]([OH:6])(=[O:5])[CH:2]([CH3:4])[CH3:3].[OH-].[CH3:8][N+:9]([CH3:12])([CH3:11])[CH3:10]>>[C:1]([O-:6])(=[O:5])[CH:2]([CH3:4])[CH3:3].[CH3:8][N+:9]([CH3:12])([CH3:11])[CH3:10]To a 20 L round bottom flask was added isobutyric acid (1300 mL, 14 mol), and an aqueous solution of 25% tetramethylammonium hydroxide (5 L, 14 mol). The water was removed under reduced pressure and azeotroped with toluene (2×2 L) to leave the product (13) as an amber liquid, which was used without further purification.
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