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
derivatives to form fluorinated analogues. All reactions proceed rapidly and under mild conditions. The use of a catalytic amount of 1 and KF in toluene led to a relatively high yield of a selected fluoroformate.
2-[(CH 3)2 NCH 2 ] C 6 H 4 }(n- Bu)2 SnF(1)与各种氯甲酸酯,酰氯,甲磺酰氯,4,4'-二甲氧基三苯甲基氯和光气前体或衍生物反应形成氟化类似物。所有反应均在温和条件下快速进行。在甲苯中使用催化量的1和KF导致选择的氟甲酸酯的产率较高。
Versatile Palladium-Catalyzed Approach to Acyl Fluorides and Carbonylations by Combining Visible Light- and Ligand-Driven Operations
作者:Yi Liu、Cuihan Zhou、Meijing Jiang、Bruce A. Arndtsen
DOI:10.1021/jacs.2c01951
日期:2022.6.1
We describe the development of a general palladium-catalyzed carbonylative method to synthesize acyl fluorides from aryl, heteroaryl, alkyl, and functionalized organic halides. Mechanistic analysis suggests that the reaction proceeds via the synergistic combination of visible light photoexcitation of Pd(0) to induce oxidative addition with a ligand-favored reductive elimination. These together create