摘要:
Bi(3,5,5-trimethyl-2-oxomorpholin-3-yl) (TM-3 dimer) undergoes bond homolysis to yield 3,5,5-trimethyl-2-oxomorpholin-3-yl (TM-3), which reduces propyldiquat (PDQ2+) to its radical cation PDQ+. The byproduct is 5,6-dihydro-3, 5,5-trimethyl-1,4-oxazin-2-one (8). Similarly, bi(5,5-dimethyl-4-ethyl-2-oxomorpholin-3-yl) (DEM-3 dimer) cleaves to 5,5-dimethyl-4-ethyl-2-oxomorpholin-3-yl (DEM-3), which reduces paraquat (PQ2+) to its radical cation PQ+. The byproduct, 5,5-dimethyl-4-ethyl-3-methoxy-2-oxomorpholine (10), results from rapid addition of methanol solvent to the transient 5,6-dihydro-4-ethyl-5, 5-dimethyl-1,4-oxazin-2-onium cation (11). Concentration versus time data for the respective viologen radical cations together with reduction potentials for the viologens place the reduction potentials for TM-3 dimer and DEM-3 dimer at -0.56 and -0.33 V versus NHE, respectively, in Tris/Tris-H+ buffered methanol. The kinetics of reduction are analyzed using numerical integration, and the two reducing agents are compared with dithionite.