Abstract
Condensation of dipyrromethane, pyrrole-2-carbaldehyde with either 9,9′-spirobifluorene or fluorene aldehyde yields new meso-monosubstituted, β-unsubstituted porphyrins. The large size of spirobifluorene hinders the rotation around the C meso –C aryl bond to give, for bis-ligated complexes, two different topological faces.
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