Phosphonomethyl-substituted phenols are readily obtained from o-hydroxymethylated phenols and trialkyl phosphites. The free acids, incorporated into phenol-formaldehyde resins, act as cation exchangers with remarkable selectivity for different metal ions. 0 1992, Hilthig & Wepf Verlag, Base1 CCC 0025-1 16X/92/$05.00
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