Synthesis and NMR studies of core-modified, N-confused porphyrins possessing alkyl groups at the rim nitrogen

초록

The '3+1' type condensation of 16-thiatripyrromethane with N-alkyl-2,4- bis[(α-hydroxy-α-phenyl)methyl]pyrrole 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 related with 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.