Preparation, cation-exchange isolation and some properties of N′-methylethylenediamine-N,N,N′-triacetic acid

Add time:08/22/2019    Source:sciencedirect.com

N′-Methylethylenediamine-N,N,N′-triacetic acid has been synthesized for the first time by a classical carboxymethylation procedure (yield 71%) using cation-exchange elution techniques to isolate the amino acid product from a complex reaction mixture, prior to crystallizing from an alcohol-water mixture. The product melted at 204–206° and its pKa values appear to be about 2.5, 5.4 and 10.3. The tri-negative anion of N′-methylethylenediamine-N,N,N′-triacetic acid forms a very stable complex with cupric ion and a moderately stable complex with calcium.

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