Prepn of chelate forming cpds useful as sequestering

摘要

Chelate-forming cpds. are prepd. by reacting cpds. (I) with hydrazines, alkylhydrazines, guanidine, biguanidine, or urea, with at least partial transformation of the X groups to methylcarbonylhydrazine, -guanine, -biguanine or -urea groups. X2N-(-(CH2)n(NX)m-(CH2)-NX-)-Xo (I) n = 2-3; m = 0-4; o = 0-1; X = CH2CY2Z; Y2 = O or H2 when Z = OH; and Y2 = O when Z = O (alkali metal), ONH4 or O-alkyl; not more than two CH2CY2Z groups being CH2CH2OH. The chelate-forming cpds. form ligand-type complexes with metal ions, such as ferrous, ferric, calcium and magnesium ions. The cpds. are useful in dyeing, printing, treatment of hard water, and for controlling the concn. of metal ions in polymsn. reactions.