4-Phenyl-4H-1,2,4-triazoline-3,5-dione, an Efficient Spin Trap for Carbon- and Metal-Centered Radicals

Article abstract of DOI:10.1021/jo00163a024

The spin adducts between a variety of organic or organometallic radicals and 4-phenyl-4H-1,2,4-triazoline-3,5-dione (Ph-TAD) have been investigated by ESR spectroscopy.Because of its reactivity toward metal-centered radicals which do not easily add to nitroso derivatives or nitrones, Ph-TAD can provide a valuable alternative to these more popular radical scavengers.The ambiguity present in the literature about the ESR parameters of some of the resulting 4-phenylurazolyl radicals is discussed.