Anti-aromaticity: 16π porphyrin metal complexes with nona-, deca-, undeca-, and dodecaalkyl substituents were synthesized. Among the nickel complexes, the 16π 5-butyl octaethylporphyrin (OEP) nickel(II) complex showed the strongest anti-aromaticity, whereas the 16π 5,10,15,20-tetrabutyl OEP nickel(II) complex was the most stable.
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Kakui et al. (2011) studied this question.
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