Danilova, G. A.; Mel'nikova, V. I.; Pivnitskii, K. K. Journal of Organic Chemistry USSR (English Translation), 1990 , vol. 26, # 10.2 p. 1905 - 1908 Zhurnal Organicheskoi Khimii, 1990 , vol. 26, # 10 p. 2208 - 2213