Photochemical rearrangement of unsaturated substrates by group migration over a π perimeter following the movement of a bicycle pedal. An example is:
BT07331.png
See also: photoisomerization
Source:
PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 308 (https://doi.org/10.1351/pac200779030293)