1. Kashemirov, B.A., Polenov, E.A., Sokol, O.C., Ilieva, T.G., Kokhlov, P.S.: J. Gen. Chem. USSR (English Transl.) 57 (1987) 2133.
2. Haire, D.L., Oehler, U.M., Krygsman, P.H., Janzen, E.G.: J. Org. Chem. 53 (1988) 4535.
3. Zhao, C.-X., Chen, G.-F., Jiang, X.-K.: J. Fluorine Chem. 38 (1988) 391.
4. Berti, C., Grierson, L., Grimes, J.A.-M., Perkins, M.J., Terem, B.: Angew. Chem. Int. Ed. Engl. 29 (1990) 653.
5. Janzen, E.G., DuBose, C.M., Kotake, Y.: Tetrahedron Lett. 51 (1990) 7395.