Yu-Hui Lu and Y. Oliver Su
meso-Tetrakis(3-sulfonatomesityl)porphyrinato]chro-mium(
III) [CrIII(tsmp)] in aqueous solution can undergo
electrochemical reduction to form a stable radical anion and oxidation to
generate very stable radical cations CrIII(tsmp.+)
and OCrIV(tsmp.+), which reacts with alkenes
to produce enones at room temperature.