Abstract
N-Confused tetraarylporphyrins react with CH 3I in the presence of Na 2CO 3 to give, in high yield, N, N′-dimethylated N-confused porphyrin salts, which are mixtures of structural isomers. The structures of the major isomers were determined by X-ray diffraction and NMR spectroscopic analyses. These N, N′-dimethylated N-confused tetraarylporphyrin salts generate singlet oxygen when irradiated at long wavelengths in the visible region, and therefore, are potential sensitizers for photodynamic therapy.
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