Synthesis of Unique Extended π Structures by Pt‐Mediated Benzannulation of Nickel(II) Tetraalkynylporphyrins

Abstract

A piece of the π! In the presence of PtCl2, NiII tetraalkynylporphyrin complex undergoes a six-endo-dig-type cyclization to form two unusual structural isomers of NiII bisphenanthroporphyrins. Under the same conditions, NiII dialkynylpicenoporphyrin forms the extended NiII picenophenanthroporphyrin (see scheme). These otherwise inaccessible π-fused exocyclic porphyrins were characterized by 2D NMR and show strongly redshifted electronic spectra. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. 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.