... ana- lytical results obtained for those elements were within ~4~0.4% of the theo- retical values. (10) H. Lefebvre, E. Levas, and E. Levas, Compt. Rend., 222, 1439 (1946). (11) Prepared according to the method of ref 3a and used without puri- fication. (12) JR Merchant and A. S ...