1. Z. D. Dubovenko and V. P. Mamaev, Izv. Sib. Otd. Akad. Nauk SSSR, Ser. Khim. Nauk (in press).
2. M. A. Mikhaleva, V. V. Gulevich, I. I. Naumenko, and V. P. Mamaev, Khim. Geterotsikl. Soedin., No. 5, 678 (1979).
3. M. A. Mikhaleva, I. I. Naumenko, and V. P. Mamaev, Khim. Geterotsikl. Soedin., No. 6, 821 (1979).
4. J. Clark, B. Parvizi, and R. Colman, J. Chem. Soc., Perkin Trans. I, No. 9, 1004 (1976).
5. N. V. Khromov-Borisov and G. M. Kheifets, Zh. Obshch. Khim., 34, 1321 (1964).