1. Holt B. and Randel, D.R., FRG Patent Appl. no. 2 110 627, 1971.
2. Kasaikina, O.T., Lobanova, T.V., Ivanov, Yu.A., Pokrovskaya, I.E., and Gagarina, A.B., Neftekhimiya, 1988, vol. 28, p. 552.
3. Jensen, R.K., Korcek, S., Zinbo, M., and Gerlock, J.L., J. Org. Chem., 1995, vol. 60, p. 5396.
4. Denisov, E.T., Usp. Khim., 1996, vol. 65, p. 547.
5. Ivanov, Yu.A., Kokorin, A.I., Shapiro, A.B., and Rozantsev, E.G., Izv. Akad. Nauk SSSR, Ser. Khim., 1976, p. 2217.