1. A. I. Polyakov and L. N. Spiridonova, Izv. Akad. Nauk SSSR, Ser. Khim., 1563 (1969).
2. L. J. Bellamy, Infrared Spectra of Complex Molecules [Russian translation], IL (1963), p. 552.
3. C. A. Martius and P. Mendelssohn-Bartholdy, Ber.,3, 444 (1870); O. Jacobsen, Ann. Chem.,157, 244 (1871).
4. J. Houben (editor), Methods of Organic Chemistry [Russian translation], 1st edition, Vol. 4, Part 1, Goskhimizdat (1949).
5. A. L. Fridman, F. M. Mukhametshin, and S. S. Novikov, Usp. Khim.,40, 64 (1971).