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  • Shining Light on TiIV Compl...
    Fermi, Andrea; Gualandi, Andrea; Bergamini, Giacomo; Cozzi, Pier Giorgio

    European journal of organic chemistry, December 7, 2020, Volume: 2020, Issue: 45
    Journal Article

    Titanium is one of the most abundant and environmentally innocuous metals. Ti‐based organometallic compounds have long been used as versatile homogeneous catalysts in synthetic chemistry and still remain highly attractive for the development of sustainable transformations. With the emerging role of photoredox catalysis, the selectivity of the radical initiation in electron transfer‐mediated reactions has been shown to be fundamental in terms of synthesis efficiency. Recent examples have displayed the effectiveness of inorganic and organic chromophores at the excited state in triggering the redox chemistry of TiIV/III complexes. In this minireview, we will illustrate the underlying principles and practicability of these – still uncommon – metallaphotoredox catalytic reactions. Metallaphotoredox catalysis is emerging as an excellent and versatile cornerstone for the development of modern synthetic methodologies. Recent examples have displayed how the redox chemistry of titanium‐based complexes can be triggered by organic and inorganic chromophores in catalytic processes activated by visible‐light, affording synthetically demanding products.