The reaction of [Rh(C₆H₅)Cl₂(PPh₃)₂] with Na[HB(mt)₃] (mt = methimazolyl) provides [RhCl(PPh₃){B(mt)₃}](Rh→B) the first authentic example of a compound with a rhodium–boron dative bond.

The reaction of the new platinaboratrane salt [PtH(PTol₃){B(mt)₃}]Cl(Pt→B)⁸ (mt = methimazolyl, Tol = C₆H₄Me-4) with 2 equivalents of PR₃ (R = Me, Et) affords, viahydride migration to boron and ligand substitution, the salts [Pt(PR₃)₂{κ²-S,S′-HB(mt)₃}]Cl, which slowly undergo B–H reactivation, to afford, ultimately, the platinaboratrane salts [PtH(PR₃){B(mt)₃}]Cl(Pt→B)⁸.