Dzhemilev, U. M.; Kurnakova, R. V.; Baibulatova, N. Z. Journal of Organic Chemistry USSR (English Translation), 1986 , vol. 22, # 8 p. 1431 - 1437 Zhurnal Organicheskoi Khimii, 1986 , vol. 22, # 8 p. 1591 - 1597