1. D. M. Seyfert, J. Organomet. Chem.,143, 153 (1977).
2. R. C. Larock, Tetrahedron,35, 1713 (1982).
3. Y. Barlengua and F. Aznar, Tetrah. Lett.,29, 5029 (1988).
4. Sh. O. Badanyan, S. Zh. Davtyan, Zh. A. Chobanyan, and S. K. Vardapetyan, Arm. Khim. Zh.,37, 407 (1984).
5. S. Zh. Davtyan, M. Zh. Aleksanyan, Zh. A. Chobanyan, and Sh. O. Badanyan, Arm. Khim. Zh.,41, 208 (1988).