Unexpected formation of the nickel seco-tribenzoporphyrazine with a tribenzotetraazachlorin-type absorption spectrum.

The reaction of NiCl(2) with 2,6-bis(4-pyridyl)pyridine (bpp) in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO) in CH(2)Cl(2) at room