Organometallic chemistry of carbaporphyrinoids: synthesis and characterization of nickel(II) and palladium(II) azuliporphyrins.

Brief treatment of azuliporphyrins 5 with nickel(II) or palladium(II) acetate in refluxing DMF afforded excellent yields of the related chelates; these novel organometallic compounds retain cross-conjugated borderline aromatic structures as judged by UV-Vis and NMR spectroscopy, and X-ray crystallography.