1. A. A. Akhrem, A. M. Turuta, and E. P. Prokof'ev, Izv. Akad. Nauk SSSR, Ser. Khim., 1124 (1972).
2. US Patent 2, 982, 777 (1961); Chemical Abstracts,55, 4592c (1961).
3. T. Komeno, Chem. Pharm. Bull., 680 (1960).
4. US Patent 3, 112, 306 (1963); Chemical Abstracts,60, 5603c (1964).
5. P. Crabbe, Optical Rotatory Dispersion and Circular Dichroism in Organic Chemistry, San Francisco-London-Amsterdam (1965).