We have investigated a series of pyrylium and thiopyrylium salts for their use in photoredox-mediated ring-opening metathesis polymerization. Excited state redox potentials, solubility, stability (photochemical and chemical), and general functional group compatibility were focus points for our studies. Structural modifications have revealed photoredox catalysts from the series that enable important capabilities, including bulk (solvent-less) curing, orthogonal polymerizations, and catalyst recycling.

Pyrylium and thiopyrylium catalysts for photoredox-mediated ring-opening metathesis polymerization

256th National Meeting (2018)

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