1. R. Ruchman, Ya. Korshich, and M. Kotar, USSR Patent 795,477 (1977), Otkrytiya, No. 1, (1981).
2. L. Fieser and M. Fieser, Reagents for Organic Synthesis [Russian translation], No. T. 7, Moscow (1978), p. 597.
3. E. Flyukiger, F. Troksler, and A. Hoffman, USSR Patent 330,613 (1969), Otkrytiya, No. 8 (1972).
4. R. Blout, V. V. W. Eager, and D. C. Silverman, J. Am. Chem. Soc.,68, 566 (1946).
5. H. Börner, G. Habter, and G. Sauer, German Patent 3,340,025 (1983), Rzh. Khimiya, No. 20127P (1986).