Aluminium tetrahydridoborate

Aluminium tetrahydridoborate is a volatile liquid. It is the most volatile aluminium compound known. It is covalent and does not contain ions but has a hydrogen-bridge structure like that of diborane, i.e. each boron atom is attached to the aluminium by two hydrogen bridges ... 

Aluminium hydride loses hydrogen on heating. It reacts slowly with diborane to give aluminium tetrahydridoborate ... 

Metals and alloys have also been suggested as destabilisation agents for borohydrides. Cho et al. (2006) reported theoretical results for using aluminium to destabilise the tetrahydridoborates of lithium and sodium. 

In 1956 Herbert C. Brown (b. 1912) discovered that in ethereal solution diborane (B2H5) dissociates into borane (BH3), which can add to an alkene. The organoborane formed can be converted to an alcohol by treatment with hydrogen peroxide, and the overall result of this hydroboration reaction is the anti-Markovnikoff addition to the double bond. Brown was also responsible for the introduction into organic chemistry of the reducing agents sodium borohydride (sodium tetrahydridoborate(lll)) and lithium aluminium hydride (lithium tetrahydridoaluminate(lll)). 

---