Double Ring Expansion from an Aromatic [18]Porphyrin(1.1.1.1) to an Antiaromatic [20]Porphyrin(2.1.2.1)

Masataka Umetani, Takayuki Tanaka, Taeyeon Kim, Dongho Kim, Atsuhiro Osuka

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Double ring expansion from a 5,15-diarylporphyrin to a 5,16-diaryl-10,11,21,22-tetradehydro[20]porphyrin(2.1.2.1) occurred through a reaction sequence consisting of oxidation with PbO2to 5,15-dioxoporphodimethene, a Corey–Fuchs reaction with tetrabromomethane in the presence of triphenylphosphine, and Fritsch–Buttenberg–Wiechell rearrangement triggered by tert-butyllithium. The obtained tetradehydro[20]porphyrin(2.1.2.1) and its mono- and dihydrogenated congeners exhibited 20 π antiaromatic character, whereas overhydrogenated congeners bearing a saturated bridge were nonaromatic owing to disrupted π conjugation.

Original languageEnglish
Pages (from-to)8095-8099
Number of pages5
JournalAngewandte Chemie - International Edition
Volume55
Issue number28
DOIs
Publication statusPublished - 2016 Jul 4

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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