1. V. Ya. Popkova and V. A. Nikanorov, Izv. Akad. Nauk SSSR, Ser. Khim., No. 9, 2148 (1989).
2. V. Ya. Popkova, E. I. Mysov, M. V. Galakhov, V. K. Osmanov, and L. S. German, Izv. Akad. Nauk SSSR, Ser. Khim., No. 12, 2862 (1990).
3. General Organic Chemistry [Russian translation], Vol. 5, Khimiya, Moscow (1983), p. 473.
4. C. Parker, J. Am. Chem. Soc.,81, 2183 (1959); C. Krespan, J. Org. Chem.,34, No. 1, 42 (1969); M. A. Kurykin, B. S. German, and I. L. Knunyants, Izv. Akad. Nauk SSSR, Ser. Khim., No. 12, 2827 (1980).
5. P. Robson, J. Roylance, K. Stephens, J. Tatlow, and R. Worthington, J. Chem. Soc., No. 1, 5748 (1964).