1. V. A. Tartakovskii, I. E. Chlenov, and S. S. Novikov, Izv. Akad. Nauk SSSR., Ser. Khim., 1842 (1966).
2. C. Parker, W. Emmons, H. Polewicz, and K. McCallum, Tetrahedron,17, 79 (1962).
3. A. A. Fridman, Yu. N. Senichev, F. A. Gabitov, and E. A. Ponomareva, Zh. Obshch. Khim.,38, 1902 (1968).
4. M. Kamlet and H. Adolph, J. Org. Chem.,33, 3073 (1968).
5. A. Macbeth and D. Pratt, J. Chem. Soc.,119, 354 (1921).