Tetrahedron Letters, , # 16 p. 9,13 Journal of the American Chemical Society, , vol. 81, p. 2427,2430 Journal of the American Chemical Society, , vol. 78, p. 624 Roczniki Chemii, , vol. 27, p. 456,464 Chem.Abstr., , p. 3176 Przemysl Chemiczny, , vol. 31, p. 196 Chem.Abstr., , vol. 48, # 5185