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The pathway of the metal-assisted electrophilic cleavage of the porphyrinogen skeleton has been synthetically elucidated in the reaction of meso-octaethylporphyrinogen−titanium and −zirconium with benzaldehyde. This reaction led to modified porphyrinogen and doubly functionalized hemiporphyrinogen derivatives.
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Solari et al. (1997) studied this question.
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