Perhaps that s the problem you re reading a borane article the one I am referring to is Attwood Bott el Al 1991 Inorg Chem p3792 3 which describes the synthesis of the gallane TMEDA adduct by a reaction of the gallane trimethylamine adduct in Et2O basically add TMEDA solution to gallane adduct solution slowly wait a while get rid of ether recrystallise jobs a good un as we say in the old country Did some similar myself once with low valent indium gallium compounds but never got a paper out of it sadly my gunk never recrystallised