BR ET

(32) Cook: J, Chem. Soc.; 65, p. 811; 1894.

(33) Michael et Conn: Am. Chen. J,; 25, j. 89; 1901.

(34) Muller et Friedberger: Ber.; 35, p. 2652; 1902.

(35) Robertson: Ber.; 106, p, 50; 1912.

(86) Cook: J. Chem. Soc.,; 65, p. 811; 1894.

(37) Balard: NES

(88) Stas: 4

(39) Fritzsche: J, prakt. Chem.; 24, p, 285.

(40) Potilizin: J. Soc. phys. Chim, Russe; 27, p. 271; 1895. (41) Buell et Crosky: J. Am. Chem. Soc.; 42, p. 1786; 1921, (42) Cärnelley et William: J. chem, Soc.; 35, p. 121; 1880, (43) Rammelsberg: Pogg, Ann.; 52, p. 81; 1841.

(44) Potilizin: J. Soc. phys. chim. Russe; 18, p, 339; 1887. (45) Potilizin: J. Soc. phys. chim. Russe; 20, p. 454, 1890, (46) Rammelsberg: Pogg. Ann.; 52, p. 98; 1841.

(47) Potilizin: : :

(48) Rudorf et Lond: Z. anorg. Ch.; 27, p. 58; 1901.

(49) Berg: Z. anorg, Chem.; 166, p. 231; 1927. Berg: Z. anorg. Chein.: 181, p. 131; 1929.

(50) Sérullas: Ann. Chim. Phys.; (2), 46, p. 297; 1831.

©1D) Potilizin: J. Soc, phys. chim. Russe; 20, (1), p. 541; 1890. (52) Marignac: Jber.; p. 342; 1855.

(53) Willard et Smith: J. Am. Soc.: 45, p. 286: 1923.