https://doi.org/10.1351/goldbook.PT07455
Photoinduced reaction of conjugated compounds (e.g., enones and carboxylic acid derivatives) leading to loss of conjugation. 
Note:
This reaction has important synthetic applications for the synthesis of frameworks of numerous natural products, such as β,γ-unsaturated carboxylic acids from photoexcitation of α,β-unsaturated carboxylic acid derivatives, excluding the use of strong bases, as required for similar isomerizations performed in the ground state.
This reaction has important synthetic applications for the synthesis of frameworks of numerous natural products, such as β,γ-unsaturated carboxylic acids from photoexcitation of α,β-unsaturated carboxylic acid derivatives, excluding the use of strong bases, as required for similar isomerizations performed in the ground state.