Bruk,Yu.A. et al. J. Gen. Chem. USSR (Engl. Transl.), 1970 , vol. 40, p. 2314 - 2318,2300 - 2303 Full Text Show Details Koller, Wolfgang; Linkies, Adolf; Rehling, Herbert; Reuschling, Dieter Tetrahedron Letters, 1983 , vol. 24, # 21 p. 2131 - 2134