Purification Methods
Dissolve in CHCl3 (EtOH-free), wash with 5% KHCO3 until effervescence ceases (if free acid is present), dry over CaCl2, filter, evaporate and distil through a short column. [B.hme & Opfer Z Anal Chem 139 255 1953, Filachione et al. J Am Chem Soc 73 5265 1951, Beilstein 3 IV 589.]
References
[1] Patent: CN105130801, 2017, B. Location in patent: Paragraph 0031; 0032; 0033; 0034; 0035; 0036; 0037-0049
[2] Journal of the Chemical Society of Pakistan, 2014, vol. 36, # 6, p. 1109 - 1113
[3] Journal of the American Pharmaceutical Association (1912-1977), 1941, vol. 30, p. 133
[4] Chem.Abstr., 1941, p. 6235
[5] Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 16, p. 259