1. D. Barton and D. Ollis, General Organic Chemistry [in Russian], Vol. 8, N. K. Kochetkov (ed.), Khimiya Press, Moscow, 588 (1985).
2. Heterocyclic Compounds [Russian translation], R. El'derfil'd (ed.), Vol. 8, Mir, Moscow, 252 (1969).
3. V. B. Prozorovskii, M. P. Prozorovskaya, and V. M. Demchenko, Farmakol. Toksikol., No. 4, 497–502 (1978).
4. S. R. Breshears, S. S. Wang, S. G. Bechtolt, and J. Christensen, J. Am. Chem. Soc.,81, 3789–3792 (1959).
5. J. Baddiley, J. C. Buchanan, F. J. Hawker, and J. E. Stephenson, J. Chem. Soc.,78, 4659–4661 (1956).