Abstract: Boranes and borane complexes react cleanly with pyrazoles giving rise to nondissociable dimers of 1-borylpyrazoles. These compounds represent a new, remarkably stable class of boron heterocycles and have been named pyrazaboles. One-step syntheses of representative pyrazaboles are described and their properties are discussed. n 1924 Morgan and Tunstall'found that a BFz I group can replace the hydrogen bridge in ...
