1. V. I. Pansevich-Kolyada and B. K. Bogush, in: Problems of Organic Synthesis [in Russian], Nauka, Moscow (1965), p. 30.
2. R. P. Barnes and L. A. Ginst, J. Amer. Chem. Soc.,72, 2509 (1950).
3. T. I. Temnikova and E. N. Kropacheva, Zh. Obshch. Khim.,19, 1917 (1949).
4. T. I. Temnikova and E. N. Kropacheva, Zh. Obshch. Khim.,22, 1150 (1952).
5. T. I. Temnikova and N. I. Almashi, Zh. Obshch. Khim.,23, 1948 (1953).