Design and Synthesis of Strongly Oxidizing Thioxanthylium Organic Photosensitizer for Green-light-driven Photoredox Catalysis

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  • TANAKA Kenta
    Graduate School of Science and Engineering, Yokohama National University
  • HOSHINO Yujiro
    Graduate School of Environment and Information Sciences, Yokohama National University
  • HONDA Kiyoshi
    Graduate School of Environment and Information Sciences, Yokohama National University

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  • 高い酸化力を有するチオキサンチリウム光増感色素の開発と緑色光照射下フォトレドックス触媒反応への応用
  • タカイ サンカリョク オ ユウスル チオキサンチリウム ヒカリゾウカン シキソ ノ カイハツ ト リョクショクコウ ショウシャ カ フォトレドックス ショクバイ ハンノウ エ ノ オウヨウ

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Abstract

<p>Organic dyes are one of attractive synthetic targets for material and biological fields in organic chemistry. Recently, organic dyes have been developed to be used as an efficient photosensitizer in photoredox catalysis, which can be applied to various types of photoredox reactions. Despite the promising properties of recently reported catalysts, these normally suffer from narrow absorption windows and the requirement of high-energy light sources (UV or blue light). Green light, on the other hand, is of lower energy (500～570 nm) than UV and blue light, which efficiently reduces energy costs and the risk of substrate/product damage and stress. In this account, our recent research on the design and synthesis of strongly oxidizing methoxy-functionalized thioxanthylium organic dyes, which absorb 400～600 nm in visible light region, is described. They can be applied to the photoredox reactions such as radical cation Diels-Alder reaction and oxa-[4+2] cycloaddition reactions under green light irradiation. The present catalysts provide a new green-light-driven photoredox catalytic system.</p>

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