R. Bernardi et al., The trapping of 1,X-biradicals, photochemically produced, with 4-cyanopyridine in neutral and acidic medium, J HETERO CH, 36(1), 1999, pp. 17-23
4-Cyanopyridine is able to trap 1,x-biradicals produced by direct photochem
ical excitation of some ketones, showing in some cases that unaspected spec
ies are formed and pyridine producs which are not explainable on the basis
of actual knowledge.