Barton reaction

https://doi.org/10.1351/goldbook.B00599
Photolysis of a nitrite to form a $\ce{\updelta\!\mbox{-}nitroso alcohol}$. The mechanism is believed to involve a homolytic $\ce{RO–NO}$ cleavage, followed by $\ce{\updelta\!\mbox{-}hydrogen}$ abstraction and radical coupling.
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2229 [Terms] [Paper]