Akimova, T. I.; Kosenko, S. V.; Tilichenko, M. N. Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 12 p. 2271 - 2277 Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 12 p. 2553 - 2560