acyl shift (1,2-, 1,3-, photochemical) 

https://doi.org/10.1351/goldbook.AT07317
Photochemical process with skeletal @I03295@ by shift of an acyl group from position 1 to position 2 or 3.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 301 [Terms] [Paper]