A novel synthetic scheme for constructing cyclic porphyrin oligomers is presented: bisporphyrin derivative 1 reacts with La(acac)3 in 1,2,4-trichlorobenzene to yield porphyrin polygons, such as cyclic dimer 12·2La(III) and cyclic trimer 13·3La(III).
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Ikeda et al. (2001) studied this question.
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