Owing to the steric bulk of the tert-butyl groups, the reactivity of the novel porphyrin 1, which has a nonplanar macrocyclic framework, deviates distinctly from that of any other known porphyrin. For example, prolonged treatment of 1 in HClO4/MeOH leads to formation of 5,15-dihydroporphyrin (“porphodi-methene”) 2.
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Ema et al. (1994) studied this question.