1. For a review of the literature, see A.H.Steiner: in “Catalysis”, P.H. Emmett, Ed. Vol. 4. p. 529, 1957.
2. C. Hansch: Chem. Rev., 52, 353 (1953); H. Pines, C.T. Goetschel: J. Org. Chem., 30, 3530 (1965)
3. R.W. Wheatcroft: Dissertation, University of California, 1949
4. M.I. Rozengart, E.S. Mortikov, B.A. Kazanskii: Dokl. Akad. Nauk SSSR, 158, 911 (1964); ibid. M.I. Rozengart, E.S. Mortikov, B.A. Kazanskii: Dokl. Akad. Nauk SSSR, 166, 619 (1966)
5. H. Pines, C.T. Chen: J. Org. Chem., 26, 1957 (1961)