1. G. Iacobucci, Ciencia e Invest.7, 48 (1951); An. Asoc. Q. Arg.42, 18 (1954).
2. M. J. Vernengo, A. S. Cerezo, G. Iacobucci, andV. Deulofeu Liebigs Ann.610, 173 (1957).
3. S. Yunusov andN. N. Progressov, J. allg. Chem.22, 1047 (1952).
4. Private communication from Prof.S. Yunusov to Dr.V. Deulofeu.
5. Private communication from Dr.S. Goodwin to Dr.V. Deulofeu.