These compounds serve as probes in the Wayne Hubbell pioneered SDSL technique, often using nitroxides. These compounds form stable adducts using traps such as PBN before studying their hyperfine couplings. Autoxidations propagate through these species, which both (15[1])initiate and are products of hydrogen atom abstractions. (15[1])Additions to these species are (*) anti-Markovnikov, (10[1])although their stability follows trends matching that (-5[1])of carbocations (“car-bo-CAT-eye-ons”). Diazo compounds such as AIBN serve as sources for these species. (10[1])Spin-paired compounds may produce these SOMO-possessing species through homolytic cleavage, especially of dihalogens or peroxides. (10[1])For 10 points, name these unstable species which contain unpaired (10[1])electrons. ■END■ (10[2]0[1])