EPR-untersuchungen an carbonsäureestern—III: Thiooxalsäureester-radikalanionen

Polarographic and cyclovoltammetric investigation of the thiooxalates 1–6 shows that they are reversibly reduced to the corresponding radical anions. Accordingly, EPR spectra are obtained after in-situ electroreduction. Taking also the electronic spectra into consideration, conclusions about the spin density distribution can be drawn. It is shown thatp^π is higher at the oxygen atoms of oxoesters than at the sulfur atoms of the corresponding thiono esters.