Synthesis and MNR Studies of Core-Modified, N-Confused porphyrins Possessing Alkyl Groups at the Rim Nitrogen

Synthesis and MNR Studies of Core-Modified, N-Confused porphyrins Possessing Alkyl Groups at the Rim Nitrogen

The '3+1'type condensation of 16-thiatripyrromethane with $N-alkyl-24-bis[(\alpha+hydroxy-\alpha-phenyl)methyl]pvrole$, in the presence of acid catalyst afforded core-modified, N-confused porphyrins bearing alkyl groups at the rim nitrogen. The proton NMR spectra indicate that the bulkiness of the N-alkyl substituents is somewhat relatedwith the tiltedness of the inverted pyrrole ring. The changes in chemical shift of inner methine protons depending on the N-alkyl group and protonation site is discussed.

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