guana mines (u as w)

pl. [Eng. guan(o), and amines.] Chem.: Bases obtained by heating the fatty acid salts of guanidine to from 220° to 230°. Guana mine, C3H5N3, or Formoguanamine, obtained by heating guanidine formate to 200°. 3(CH3 N3 HCOOH= C3H5N3+4NH3+CO2+2CO+2H2O. The fused ma is mixed with an equal volume of cold water filtered, the residue di olved in small quantities in hot water, and precipitated with a concentrated solution of oxalic acid. The oxalate is decomposed by caustic soda, which throws down the base in white crystalline needles, melting above 350°, which are easily soluble in boiling water, and slightly soluble in alcohol. Aceto-guana mine is obtained by heating dry guanidine acetate to 230°. It melts at 265, and soluble in alcohol and in hot water. This substance was formerly called guana mine. and- idine.j