| abstract |
The invention is referring to a process for the purification of 1,4-benzoquinone guanylhydrazone thiosemicarbazone (ambazone) in two steps. In the first step, it takes place the removal of sulfur from ambazone by maceration of ambazone in a non-polar solvent (benzene, n-hexane, toluene or xylene). In the second step, it takes place the recrystallization of ambazone from a mixture N,N-dimethylformamide and lower aliphatic alcohols (C1-C4) at temperatures between 50 - 80 °C. |