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2. 2) Gemal A. L., Luche J.-L., J. Org. Chem., 44, 4187–4189 (1979).
3. 3) Luche J.-L., Gemal A. L., J. Am. Chem. Soc., 101, 5848–5849 (1979).
4. 4) Selected examples. See also ref. 5. Herr M. E., Heyl F. W., J. Am. Chem. Soc., 75, 5927–5930 (1953).
5. 5) Gardner J. N., Anderson B. A., Oliveto E. P., J. Org. Chem., 34, 107–112 (1969).