N,N'-diacetic acid-N'-cyanomethyl, salts thereof, and their prep

Details N,N'-diacetic acid-N'-cyanomethyl, salts thereof, and their prep N,N'-diacetic acid-N'-cyanomethyl, salts thereof, and their prep

1992-07-30

1993-03-02

Brust, Joseph Paul

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitriles

5483001, C07C25330

Patent

active

051911060

ABSTRACT:
A novel intermediate useful in the synthesis of ethylenediaminetriacetic acid (ED3A) or its salts. A salt of N,N'-ethylenediaminediacetic acid (ED2AH.sub.2) is condensed with formaldehyde to form a stable 5-membered ring intermediate. The addition of cyanide across this cyclic material forms ethylenediamine N,N'-diacetic acid-N'-cyanomethyl or salts thereof (mononitrile-diacid), which is a useful intermediate in the production of ED3A. The nitrile in aqueous solutions may be spontaneously cyclized to form 2-oxo-1,4-piperazinediacetic acid (3KP) or salts thereof. In the presence of excess base, salts of ED3A are formed in excellent yield and purity.

REFERENCES:
patent: 4704465 (1987-11-01), Lannert et al.

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