Abstract
Attachment of functional groups at the designated β-pyrrolic positions in asymmetrically substituted porphyrins is important in building customized model systems. We have developed a synthetic method of mono-functionalized dipyrromethanes at one of the β-pyrrolic positions. Synthesis of β-mono-brominated AB 2 C and ABCD type porphyrins was achieved by “2+2” condensation therefrom.
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