1. O. A. Teutov, É. V. Uglova, and V. D. Makhaev, Dokl. Akad. Nauk SSSR,188, 833 (1969).
2. J. M. Jerkunica and T. G. Traylor, J. Am. Chem. Soc.,93, 6278 (1971).
3. I. P. Beletskaya, S. V. Rykov, V. B. Vol'eva, A. L. Buchachenko, and A. V. Kessenikh, Izv. Akad. Nauk SSSR, Ser. Khim., 684 (1972).
4. V. D. Makhaev, Dissertation, Moscow, 1972.
5. J. E. Leffler, J. Am. Chem. Soc.,75, 3598 (1953).