Kartashov, A. V.; Chuvatkin, N. N.; Boguslavskaya, L. S. Journal of Organic Chemistry USSR (English Translation), 1988 , vol. 24, # 12 p. 2276 - 2278 Zhurnal Organicheskoi Khimii, 1988 , vol. 24, # 12 p. 2522 - 2525