1,6-Addition of Tertiary Carbon Radicals Generated From Alcohols or Carboxylic Acids by Visible-Light Photoredox Catalysis.

The addition of tertiary carbon radicals generated by an Ir-catalyzed visible-light photocatalyst to electron-deficient 1,3-dienes proceeds in good yields to append a δ-substituted β,γ-unsaturated carbonyl fragment to a tertiary alcohol or carboxylic acid precursor and construct a new quaternary carbon center.