Several new p-benzoquinones substituted with one to four electron-withdrawing groups were prepared, including 2, 3-dicyano-5-phenylsulfonyl-p-benzoquinone (3), 2, 3-dicyano-5- chloro-6-phenylsulfonyl-p-benzoquinone (6), trifluoromethylsulfonyl-p-benzoquinone (8), 2, 6-bis (trifluoromethylthio)-p-benzoquinone (lo), and tetrakis (trifluoromethy1thio)-p- benzoquinone (15). Polarographic reduction potentials of the new quinones were ...
