Formation of a [2+2]-heterotetranuclear macrocycle from reaction of a platina-homoditopic ligand with iron(II)

Reaction of 4`-(2-propyn-1-oxy)-2,2`:6`,2``-terpyridine (HC= CCH(2)Oterpy) with trans-[PtI2(PEt3)(2)] regioselectively metallates the alkyne to give trans-[Pt(C=CCH(2)Oterpy)(2)(PEt3)(2)] which, when treated with Fe(II), gives a [2 + 2]-metallocycle.

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