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a) Possible porphyrin atropisomers based on meso‐substitution; b) The ‘picket fence’ concept: in α4‐orientation pivalic groups at meso positions forms oxygen‐binding pocket to the porphyrin ring while bulky base group disfavors coordination of base on ‘picket fence’ side and prevents oxygen coordination on the unhindered side; [12] c) Without ‘picket fence’ shielding rapid autoxidation yields a μ‐oxo ferric dimer.
