Base-catalyzed hydrogen isotope preparation

The base-catalyzed hydrogen exchange of pyrazoles has been studied by Vaughan and conveniently summarized in <74AHC(16)l) and (B-76MI40402). The method has been used to prepare the isotopic species necessary to assign the fundamental vibration of pyrazole (Sections 4.04.1.3.7(i) and 4.04.3.3.3). 

---