芳香族化合物在酸的作用下可发生可逆的氢交换。该过程是质子对芳香环作亲电进攻,生成过渡态的芳烃离子,后者再失去氢离子完成了氢的化学交换,因而本质是亲电取代反应。例如某些简单的芳香族化合物用重水 Aromatic compounds undergo reversible hydrogen exchange under the action of acids. This process is the proton to the aromatic ring for electrophilic attack, generating transitional aromatic hydrocarbon ion, which then lost the hydrogen ion to complete the chemical exchange of hydrogen, so the essence is the electrophilic substitution reaction. For example, some simple aromatic compounds with heavy water