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Keeping it in the family: A one-pot condensation with a boric acid template leads to the synthesis of subporphineboron (III) complexes (see example; B green, O red, N blue, C turquoise, H white), ring-contracted congeners of porphyrins. Facile axial ligand exchange reactions provide alkoxy- and carboxy-coordinated subporphyrins, which have bowl-shaped structures with a bowl depth that depends on the axial group. Supporting information for this article is available on the WWW under http: //www. wiley-vch. de/contents/jc₂002/2006/z503426ₛ. pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Inokuma et al. (Tue,) studied this question.