|
Since the Pd(II)-complexes of meso-alkylidene-(m-benzi)-porphyrin show promising catalytic activity toward C-C bond forming reactions such as Sonogashira coupling, we extend the metallation chemistry of meso-alkylidene-(m-benzi)-porphyrin to other transition metal ions. The reaction is straight forward and column chromatographic separation usually results in pure metal complexes. Pd(II), Cu(II) and Ni(II) form stable complexes. However, the Ag(I) need axial ligands to stabilize the metal complex. The inner aromatic sp2-carbon participates in the coordination with metal ion in the case of Pd(II) and Ni(II), however, in the case of Cu(II), only three core nitrogens participate in the coordination. All adducts were characterized by spectroscopic means. The current metal complexes can be used as catalysts in the various C-C bond forming reactions as well as C-H activations.
|
KCS