1. T. P. Vasil'eva, V. M. Bystrova, O. V. Kil'disheva, and I. L. Knunyants,Izv. Akad. Nauk SSSR, Ser. Khim., No. 6, 1303 (1986).
2. A. A.Espenbetov, Candidate's Dissertation, Chemical Sciences, Institute of Heteroorganic Compounds (INÉOS), Moscow (1986), p. 67.
3. W. Walter, B. Krische, and G. Adiwidjaja,Chem. Ber. 111, No. 5, 1685 (1978).
4. W. Walter, B. Krische, and G. Adiwidjaja,Liebigs. Ann. Chem., No. 1, 14 (1980).
5. A. Kucsman and I. Kapovits,J. Mol. Struct. 125, No. 3/4, 331 (1984).