1,2-Dihydro-1,2,4,3-triazaphospholo[4,5-a]quinolines as electron carriers in the electrochemical reduction of 1,1-dichloro-2-methoxycarbonyl-2-methylcyclopropane

Electrochemical reduction of 1-X-1-R-1-5-methyl-2-phenyl-7-R-2-1,2-dihydro- 1,2,4,3-triazaphospholo[4,5-a]quinolines 1-5 (1: X is the lone electron pai r (LEP), R-1 = Et2N, R-2 = Me; 2: X = LEP, R-1 = Ph, R-2 = H; 3. X = S, R-1 = Et2N, R-2 = H; 4. X = LEP, R-1 = Et2N, R-2 = H; 5: X = LEP, R-1 = MeO, R -2 = H) in DMF with 0.1 M Bu4NI as supporting electrolyte is reversible and results in metastable radical anions. Radical anions of compounds 1-3 effi ciently reduce 1,1-dichloro-2-methoxycarbonyl-2-methylcyclopropane both in the presence and in absence of Ni-II ions. Effective reduction rate constan ts have been evaluated.