The hydrolytic stability of heteroaryltrifluoroborates under physiological conditions has been analyzed by 19F NMR spectroscopy and is found to be greatly enhanced by the presence of endocyclic ring nitrogens. Stability is further enhanced by the presence of exocyclic electron withdrawing substituents. As with aryltrifluoroborates, NMR analysis suggests that the hydrolysis proceeds via single rate-determining
杂芳基三
氟硼酸酯在生理条件下的
水解稳定性已通过19 F NMR光谱分析,发现由于存在环内环氮而大大提高。环外吸电子取代基的存在进一步提高了稳定性。与芳基三
氟硼酸酯一样,NMR分析表明
水解反应通过单个速率确定步骤进行,反映了第一个
氟原子的损失。这些络合物的稳定性在
金属催化的交叉偶联反应以及产生基于
硼酸的18 F-PET显像剂方面均具有重要意义。