Porphyrin Analogues of a Trityl Cation and Anion

Kenichi Kato, Woojae Kim, Dongho Kim, Hideki Yorimitsu, Atsuhiro Osuka

Research output: Contribution to journalArticle

4 Citations (Scopus)


Porphyrin-stabilized meso- or β-carbocations were generated upon treatment of the corresponding bis(4-tert-butylphenyl)porphyrinylcarbinols with trifluoroacetic acid (TFA). Bis(4-tert-butylphenyl)porphyrinylcarbinols were treated with TFA to generate the corresponding carbocations stabilized by a meso- or β-porphyrinyl group. The meso-porphyrinylmethyl carbocation displayed more effective charge delocalization with decreasing aromaticity compared with the β-porphyrinylmethyl carbocation. A propeller-like porphyrin trimer, tris(β-porphyrinyl)carbinol, was also synthesized and converted to the corresponding cation that displayed a more intensified absorption reaching over the NIR region. meso-Porphyrinylmethyl carbanion was generated as a stable species upon deprotonation of bis(4-tert-butylphenyl)(meso-porphyrinyl)methane with potassium bis(trimethylsilyl)amide (KHMDS) and [18]crown-6, whereas β-porphyrinylmethyl anions were highly unstable.

Original languageEnglish
Pages (from-to)7041-7045
Number of pages5
JournalChemistry - A European Journal
Issue number21
Publication statusPublished - 2016 May 17

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry

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