1. B. M. Mikhailov and A. N. Blikhina, Proc. Acad. Sci. USSR, 80, 373 (1951).
2. B. M. Mikhailov and A. N. Blokhina. Problems in the Mechanism of Organic Reactions, Kiev, 1954, p. 215.
3. G. W. Stacy and R. I. Morath, J. Amer. Chem. Soc. 74, 3885 (1952).
4. H. Inoue, Bull Chem. Soc. Japan 1, 777 (1926).
5. S. K. Metze, J. Indian Chem. Soc. 9, 633 (1932).