Unlocking the metallaboratrane cage: reversible B–H activation in platinaboratranes

Abstract
The reaction of the new platinaboratrane salt [PtH(PTol3){B(mt)3}]Cl(PtB)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)22-S,S′-HB(mt)3}]Cl, which slowly undergo B–H reactivation, to afford, ultimately, the platinaboratrane salts [PtH(PR3){B(mt)3}]Cl(PtB)8.