Nickel complexes tetrafluoroethylene

Addition of tetrafluoroethylene to 167a affords the 1,3-metallaoxolane 168 (200) in contrast to the corresponding reaction of the nickel complex 158a, in which HFA is exchanged (135). 

In all the complexes shown in Table 9 (with one exception) the nickel atom is four-coordinated by two phosphorus atoms and by two carbon atoms in a distorted planar arrangement (24a). The plane containing the nickel and phosphorus atoms and the plane containing the nickel and the coordinated carbon atoms form a dihedral angle which varies between 4° and 27° (24b), depending on the coordinated alkene. In the [Ni(p3)(C2F4)2] complex (25) the nickel atom is five-coordinated by three phosphorus atoms of the tridentate ligand and two carbon atoms of tetrafluoroethylene. 

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