Synthesis of New 3,4-Disubstituted 2,5-Dihydro-1H-pyrrol-1-yloxyl Spin-Label Reagents via Allylic Rearrangements - Hideg, Kálmán; Sár, Cecília P; Hankovszky, Olga H; Tamás, Tünde; Jerkovich, Gyula (Synthesis, 1993)