SYNTHESIS AND CHARACTERIZATION OF PORPHYRAZINOCTAMINE DERIVATIVES - X-RAY CRYSTALLOGRAPHIC STUDIES OF [2,3,7,8,12,13,17,18-OCTAKIS(DIBENZYLAMINO)-PORPHYRAZINATO]MAGNESIUM(II) AND (2,3,7,8,12,13,17,18-OCTAKIS[ALLYL(BENZYL)AMINO]-PORPHYRAZINATO)NICKEL(II)

2,3-Bis(dibenzylamino)- and 2,3-bis[allyl(benzyl)ami no]-2Z-butene-1,4-dinitriles are macrocyclised by reaction with magnesium propoxide in propanol to provide the corresponding (porphyrazinato)magnesium(II) derivatives, the structures of which are confirmed by X-ray crystallographic studies of the title magnesium and nickel(ll) complexes; cyclisation of alternative diaminomaleonitrile derivatives gives the corresponding porphyrazinoctamines.