Razin, V. V.; Zadonskaya, N. Yu.; Shamurzaev, Kh. T. Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 6.2 p. 1093 - 1100 Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 6 p. 1253 - 1262