Kartashov, V.R.; Sokolova, T.N.; Skorobogatova, E.V.; Grishin, Yu.K.; Bazhenov, D.V.; et al. Journal of Organic Chemistry USSR (English Translation), 1988 , vol. 24, p. 1519 - 1525 Zhurnal Organicheskoi Khimii, 1988 , vol. 24, # 8 p. 1684 - 1690