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3. N. S. Smirnova, S. K. Klimenko, M. N. Berezhnaya, T. V. Stolbova, and V. G. Kharchenko, Zh. Org. Khim., 11, 440 (1975).
4. V. A. Palm, Introduction to Theoretical Organic Chemistry [in Russian], Vysshaya Shkola, Moscow (1974), p. 88.
5. V. D. Tilak, P. B. Mitra, and Z. Miljani, Tetrahedron, 25, 1939 (1969).