Prepd by the action of 2,4-pentanedione on an soln of beryllium hydroxide in dil acetic acid or on a soln of beryllium chloride in presence of ammonia: Biltz, Ann. 331, 336 (1904); Parsons, J. Am. Chem. Soc. 26, 732 (1904); Arch, Young, Inorg. Synth. 2, 17 (1946); from 2,4-pentanedione and beryllium sulfate in NaOH soln: Jones, J. Am. Chem. Soc. 81, 3188 (1959).