1. O. Rogne, J. Chem. Soc. Perkin Trans. II, No. 8, 1334?1337 (1971).
2. R. V. Vizgert, N. N. Maksimenko, and V. P. Panov, Zh. Org. Khim.,17, No. 3, 605?609 (1981).
3. V. A. Savelova, I. A. Belousova, and L. M. Litvinenko, ibid., No. 7, 1499?1505.
4. V. A. Savelova, I. A. Belousova, L. M. Litvinenko, and Yu. S. Simanenko, ibid.,21, No. 6, 1268?1275 (1985).
5. L. M. Litvinenko, A. G. Gershikov, B. V. Panchenko, et al., Teor. Éksp. Khim.,21, No. 5, 521?529 (1985).