1. W. Dilthey, J. Prakt. Chem.,94, 53 (1916).
2. W. Dilthey and R. Taucher, Chem. Ber.,53, 252 (1920).
3. I. Berson, J. Am. Chem. Soc.,74, 358 (1952).
4. I. P. Griot, I. Royer, and I. Dreux, Tetrahedron Lett., No. 26, 2195 (1969).
5. A. I. Pyshchev, Thesis for Candidate of Chemical Sciences [in Russian], Rostov University, Rostov-on-Don (1977).