1. G. Zigeuner, H. Brunetti, H. Ziegler undM. Bayer, Mh. Chem.101, 1767 (1970).
2. G. Zigeuner, A. Frank, H. Dujmovits undW. Adam, Mh. Chem.101, 1415 (1970).
3. G. Zigeuner, E. Fuchs, H. Brunetti undH. Sterk, Mh. Chem.97, 36 (1966).
4. W. Traube undR. Schwarz, Ber. dtsch. chem. Ges.32, 3163 (1899).
5. V. G. Golov, V. G. Vodop'janov undJu. J. Muskin, J. organitsch. Khim.7, 2104 (1971).