1. Kochetkov, N.K. and Nifant’ev, E.E., Zh. Org. Khim., 1961, p. 31.
2. Meshram, H.M., Reddy, P.N., Vishnu, P., Sadashiv, K., Yadav, J.S., Tetrahedron Lett., 2006, vol. 47, p. 991.
3. Bozhenkov, G.V., Levkovskaya, G.G., Larina, L.I., Ushakov, P.E., Dolgushin, G.V., Mirskova, A.N., Zh. Org. Khim., 2004, vol. 40, p. 1632.
4. Schonbrodt, R., Lieb. Ann., 1989, vol. 253, p. 168.
5. Pashkevich, K.I., Skryabina, Z.E., and Saloutin, V.I., Izv. Akad. Nauk SSSR, Ser. Khim., 1987, p. 2527.