Synthesis of a Stable B₂H₅⁺ Analogue by Protonation of a Double Base‐Stabilized Diborane(4)

Abstract

Polarity of H+ reversed: The synthesis of [B2H3(hpp)2]+I−,a dinuclear borohydride with terminal and bridging H atoms (see picture; B yellow, N blue, C gray, H white, I purple), is made possible with the ligand hexahydropyrimidopyrimidate (hpp). In the course of the reaction the proton is converted into a hydride.