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• W2049582331 abstract "Abstract Bulky diarylammonium pentafluorobenzenesulfonates effectively promote dehydration reactions, such as condensation reactions to give esters and the dehydrative cyclization of 1,3,5‐triketones. In particular, N ‐(2,6‐diphenylphenyl)‐ N ‐mesitylammonium pentafluorobenzenesulfonate shows much higher catalytic activity than C 6 F 5 SO 3 H under reaction conditions without the removal of generated water, even though the former is a weaker acid. Its crystallization gives an aggregated cyclic ion pair, which is composed of two diarylammonium cations, four pentafluorobenzenesulfonate anions, and two oxonium cations. This ion pair is strongly stabilized by four intermolecular and two intramolecular π–π attractive interactions and 10 hydrogen bonds. The extremely high catalytic activity of N ‐(2,6‐diphenylphenyl)‐ N ‐mesitylammonium pentafluorobenzenesulfonate in the dehydration reactions may be ascribed to the local hydrophobic environment of the tightly aggregated ammonium salts." @default.
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• W2049582331 date "2007-03-26" @default.
• W2049582331 modified "2023-10-17" @default.
• W2049582331 title "Unusual Rate Acceleration in Brønsted Acid Catalyzed Dehydration Reactions: Local Hydrophobic Environment in AggregatedN-(2,6-diphenylphenyl)-N-mesitylammonium Pentafluorobenzenesulfonates" @default.
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• W2049582331 doi "https://doi.org/10.1002/asia.200600380" @default.
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