1. W. Ochial, M. Obayashi, and K. Morita, Tetrahedron,23, No. 1, 2641 (1967); A. Lablanche-Combier and M. L. Villaume, Tetrahedron,24, No. 24, 6951 (1968).
2. V. Bertolasi, G. Gilli, and A. C. Veronese, Acta Crystallogr.,B38, No. 2, 502 (1982).
3. A. B. Zolotoi, A. V. Prosyanik, O. A. D'yachenko, et al., Izv. Akad. Nauk SSSR, Ser. Khim., No. 6, 1320 (1984).
4. L. O. Atovmyan, V. V. Tkachev, A. B. Zolotoi, and V. M. Berestovitskaya, Dokl. Akad. Nauk SSSR,291, No. 6, 1389 (1986); V. V. Tkachev, L. O. Atovmyan, V. M. Berestovitskaya, and D. A. Efremov, Zh. Strukt. Khim.,29, No. 2, 112 (1988).
5. I. E. Efremova, V. M. Berestovitskaya, and V. V. Perekalin, Zh. Org. Khim.,20, No. 4, 890 (1984).