Macrocyclization of 2,3-dicyano-1,4-diox-2-ene with magnesium propoxide in propanol provided the enantiomerically pure C4-symmetric (porphyrazinato)magnesium(II) complex 1. The structure of the macrocycle was confirmed by an X-ray crystallographic study on the demetalated porphyrazine.
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Cook et al. (1997) studied this question.
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