1. 18. Mitt.:H. Falk, K. Grubmayr, G. H�llbacher, O. Hofer, A. Leodolter, F. Neufingerl undJ. M. Rib�, Mh. Chem.108, 1113 (1977).
2. D. A. Lightner undY. T. park, Tetrahedron Lett.1976, 2209.
3. H. Falk undK. Grubmayr, Synthesis1977, 614.
4. F. Beck, Elektroorganische Chemie. Weinheim: Verlag Chemie. 1974.
5. P. Delahay, New Instrumental Methods in Electrochemistry. New York: Interscience. 1954.