1. I. Wender, R. Levine, and M. Orchin, J. Am. Chem. Soc., 71, 4160 (1949).
2. I. Wender, R.A. Friedel, and M. Orchin, Science, 113, 206 (1951).
3. K.H. Ziesecke, Brenn. Chem., 33, 385 (1952).
4. J. Berty, L. Markò, and D. Kallo, Chem. Tech. (Berlin), 3, 260 (1956).
5. G.N. Butter (Commercial Solvent Co.), Belg. Patent 618, 413 (1962).