transformation of a wide variety of alcohols or carboxylic acids into the corresponding halides. Yields are high and conditions are very mild thus allowing for the presence of sensitive functional groups. The reagents can be easily tuned allowing therefore the selective monohalogenation of polyhydroxylated molecules. The scope and chemoselectivity of the reactions have been studied and reaction mechanisms
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 aceticacid, the nucleophilicity of the fluoride ion therein is much reduced by the verystronghydrogen bonding which occurs between it and the solvent. The fluoride is in effect enhancing the nucleophilicity of the hydroxyl oxygen atom of the carboxylicacid group. Reaction of chlorocarboxylic acids and their derivatives with this reagent produces acetoxy- instead