Add time:07/12/2019         Source:sciencedirect.com

The macrocyclization reactions led to higher-symmetry and lower-symmetry porphyrazines bearing peripheral 2,5-di(4′-chlorophenyl)pyrrol-1-yl and dimethylamino substituents, which were characterized using NMR and X-ray crystallography. The reactions were performed in the conditions of Linstead macrocyclization with magnesium n-butanolate in n-butanol with an addition of a malonitrile derivative in solid form or after dissolving it in DMF. It is interesting to note that the addition of DMF increases the total yield of the reaction from low to moderate, and forces the synthesis of the higher-symmetry over the lower-symmetry porphyrazine. The non-alternate order of peripheral substituents in lower-symmetry porphyrazine resulted in the non-equivalence of dimethylamino groups in 1H and 13C NMR spectra. The X-ray crystal structures of both porphyrazines revealed an almost perpendicular orientation of the bulky, 2,5-di(4′-chlorophenyl)pyrrol-1-yl substituents to the cores. Higher-symmetry porphyrazine was used in the Suzuki–Miyaura reaction with phenylboronic acid. This led with a high yield to the derivative possessing peripheral 2,5-di(biphenyl-4-yl)pyrrol-1-yl and dimethylamino substituents.

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