sulfuric acid in neat (no solvent) Ar atmosphere; heating (126-128°C, 2 h); reaction mixt. extn., residue treatment with concd. H2SO4;

in neat (no solvent) Ar atmosphere; heating (126-128°C, 2 h); reaction mixt. extn. leads to o-carbaborane, residue treatment with IClin ether leads to 1,2-diiodo-o-carbaborane;