α-expulsion

in photochemistry
https://doi.org/10.1351/goldbook.E00008
A general reaction by which a group attached to the alpha carbon of an excited @C01076@ is expelled either as an odd electron species or as an anionic species. This reaction should be distinguished from an @A00004@.
Source:
PAC, 1988, 60, 1055. (Glossary of terms used in photochemistry (Recommendations 1988)) on page 1059 [Terms] [Paper]