Photochemical reaction of a 1-aza-1,4-diene or a 2-aza-1,4-diene in the triplet excited state to form the corresponding cyclopropylimine.
See also: di-π-methane rearrangement, di-π-silane rearrangement, oxa-di-π-methane rearrangement
Source:
PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 305 (https://doi.org/10.1351/pac200779030293)