Tetrahydroxydiboron (Bis‐boric Acid): a Versatile Reagent for Borylation, Hydrogenation, Catalysis, Radical Reactions and H₂ Generation

Diboron compounds with a B−B bond, discovered B2Cl4 century ago, have been developed only since the turn of this for catalyzed borylation reactions, mostly well-know reagent bis(binacolato)diboron, (B2pin2). On other hand, chemistry tetrahydroxydiboron (THDB), also named bis-boric acid, is relatively underdeveloped. In review, properties THDB as borylation, reductant (including transfer hydrogenation), catalyst, source radicals and generator H2 from water upon hydrolysis are summarized.