Less reactive hydroxyls, such as those present in secondary alcohols and in some primary alcohols, phenols and carboxylic acids, were easily tritylated with the homogeneous assistance of equimolar quantities of chlorides of di- and trivalent metals in aprotic solvents. The metal ions allowed both high concentration of the effective reagent triphenylmethylcarbenium ion and mobilisation of the hydroxyl
在质子惰性溶剂中,通过等摩尔量的二价和三价
金属
氯化物的均相助剂,反应性较低的羟基(例如存在于仲醇和某些伯醇,
酚和
羧酸中的羟基)很容易被三苯甲基化。
金属离子允许高浓度的有效试剂三苯基甲基碳鎓离子和羟基质子的移动,从而引起快速的室温取代反应。实验条件温和,以至于其他保护基团,如烷基或三苯甲基保护的羧基和(9-
芴基甲氧基羰基)-或三苯甲基保护的
氨基均不受影响。