Reaction of the hydrogen halides HF, HCl, and HBr with oxotitanium(IV)tetraphenylporphyrin gives the corresponding dihalogeno titanium(IV) complexes which show a novel pattern of reduction: the difluoride complex provides the first example of a titanium(IV) porphyrin in which the site of the first reduction is the metal ion rather than the porphyrin ring or the axial ligand.
M. Nakajima, J. Latour and J. Marchon, J. Chem. Soc., Chem. Commun., 1977, 763 DOI: 10.1039/C39770000763
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