Flash Communication: Ring-Opening of Biphenylene with Magnesium(I) and Magnesium–Dinitrogen Complexes
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Rare examples of reductive C–C single bond cleavages using main group metal complexes have been achieved in reactions between biphenylene and a magnesium–dinitrogen complex and an anionic magnesium(I) compound, [K2{Mg(EtNONTCHP)}2(μ-N2)] and [K{Mg(EtNONTrip)}]2 (EtNONTCHP and EtNONTrip = bulky bis(anilido)xanthenes), respectively. In the products, [K2{Mg(EtNONAr)}2(μ-C12H8)] (Ar = TCHP or Trip), the reduced biphenyldiyl ligand [C12H8]2–, bridges two Mg centers through its 2,2′-positions.



