Journal of the American Chemical Society, , vol. 49, p. 3157 Journal of the American Chemical Society, , vol. 49, p. 3145 Journal fuer Praktische Chemie (Leipzig), , vol. <2> 105, p. 358 Journal of the American Chemical Society, , vol. 44, p. 206 Industrial and Engineering Chemistry, , vol. 15, p. 1049 Industrial and Engineering Chemistry, , vol. 18, p. 536 Chem. Zentralbl., , vol. 97, # II p. 971 Journal of the American Chemical Society, , vol. 49, p. 3155