Reactions of potassium fluoride in glacial acetic acid with chlorocarboxylic acids, amides, and chlorides. The effect of very strong hydrogen bonding on the nucleophilicity of the fluoride anion
作者:James H. Clark、John Emsley
DOI:10.1039/dt9750002129
日期:——
Although KF is very soluble in glacial acetic acid, the nucleophilicity of the fluoride ion therein is much reduced by the very strong hydrogen bonding which occurs between it and the solvent. The fluoride is in effect enhancing the nucleophilicity of the hydroxyl oxygen atom of the carboxylic acid group. Reaction of chlorocarboxylic acids and their derivatives with this reagent produces acetoxy- instead
尽管KF在冰醋酸中非常易溶,但其中的氟离子的亲核性却因其与溶剂之间形成的非常强的氢键而大大降低。氟化物实际上增强了羧酸基团的羟基氧原子的亲核性。氯羧酸及其衍生物与该试剂的反应生成乙酰氧基,而不是预期的氟代衍生物。酰氯Cl(CH 2)n COCl,酸Cl(CH 2)n CO 2 H和一些酰胺Cl(CH 2)n CONH 2(n = 1,2,3等)。)已被研究,并阐明了它们在乙酸中与KF的反应。除取代外,内酯化和消除反应也可能发生。一些新产品已被隔离和表征。据报道仅涉及KF的相关反应。这些聚合中的某些聚合发生。