di-π-silane rearrangement 

https://doi.org/10.1351/goldbook.DT07360
Silicon version of the di-π-methane rearrangement with a Si atom at position 3 of the basic 1,4-diene chromophore.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 326 [Terms] [Paper]