1. H. Newman, J. Org. Chem., 29, 1461 (1964).
2. V. B. Mochalin, Yu. N. Porshnev, and G. I. Samokhvalov, Zh. Obshch. Khim., 39, 701 (1961).
3. G. F. Woods and H. Sanders, J. Amer. Chem. Soc., 68, 2483 (1946).
4. F. Korte, A. Bilow, and R. Heinz, Tetrahedron, 18, 657 (1962).
5. S. M. Makin, V. M. Likhosherstov, and M. N. Shelemina, Zh. Obshch. Khim., 34, 1809 (1964).