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 wate...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 Br?nsted-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 functional- ized Br?nsted acidic ionic liquid with the two acid sites (IL-3) exhibited the most excellent catalytic performance under mild reaction conditions. The —COOH functionalized Br?nsted acidic ionic liquid could be conveniently separated from the product and easily recycled in subsequent runs.展开更多
基金the National Key Technology R&D Program of China (Grant No. 2006BAE03B06)Shanghai Leading Academic Discipline Project (Grant No. B409)
文摘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 Br?nsted-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 functional- ized Br?nsted acidic ionic liquid with the two acid sites (IL-3) exhibited the most excellent catalytic performance under mild reaction conditions. The —COOH functionalized Br?nsted acidic ionic liquid could be conveniently separated from the product and easily recycled in subsequent runs.
