2,3-Bis(di benzylaminoj-and 2,3-bis[allyl( benzyl)amino]-2Z-butene-l,4-dinitriles are macrocyclised by reaction with magnesium propoxide in propanol to provide the corresponding (porphyrazinato)magnesium(tt) derivatives, the structures of which are confirmed by X-ray crystallographic studies of the title magnesium and nickel(i1) complexes; cyclisation of alternative diaminomaleonitrile derivatives gives the corresponding porphyrazinoctamines.
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