Abstract
The acetalization reactions of isobutyraldehyde with 2,2,4-trimethyl-1,3-pentanediol (TMPD) for the synthesis of 2,4-diisopropyl-5,5-dimethyl-1,3-dioxane were carried out under mild reaction conditions using four water-stable Bronsted-acidic task-specific ionic liquids ([HMIM]BF4, —SO3H functionalized acidic ionic liquid, —COOH functionalized acidic ionic liquid, [NMP][HSO4]) as environmentally benign catalysts for the first time. The process is highly effective and very selective. The —COOH functionalized Bronsted acidic ionic liquid with the two acid sites (IL-3) exhibited the most excellent catalytic performance under mild reaction conditions. The —COOH functionalized Bronsted acidic ionic liquid could be conveniently separated from the product and easily recycled in subsequent runs.
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