1. Porter, T. H., Folkers, K., Angew. Chem.86, 635 (1974); Angew. Chem., Int. Ed. Engl.13, 559 (1974).
2. Entwistle, J. D., Williams, P. J., Devlin, B. R. J., (Shell Internationale Research Maatschappij N.V.) Ger. Offen. 2107,053 (Cl. C07 d) 26. Aug. 1971, Brit. Appl. 17. Feb. 1970-23. Dec. 1970: vgl. C. A.76, 3854 m (1972).
3. Kumar, G., Bhaduri, A. P., Dhar, M. L., Indian J. Chem.12, 129 (1974).
4. Eistert, B., Goubran, L. S. B., Vamvakaris, Ch., Arackal, T. J., Chem. Ber.108, 2941 (1975).
5. Ott, R., Pinter, E., Kajtna, P., Mh. Chem.111, 813 (1980).