Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Patent
1991-12-21
1993-01-05
Lee, Mary C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
C07C25500
Patent
active
051772434
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 useful intermediate in the production of ED3A. The nitrile in aqueous solutions may be spontaneously cyclized to form 2-oxo-1,4-piperazindeiacetic acid (3KP) or salts thereof. In the presence of excess base, salts of ED3A are formed in excellent yield and purity.
REFERENCES:
CA 114:117859a Chelants . . . , thereof. Wilson et al., p. 362, 1991.
Baker William L.
Lee Mary C.
Lemack Kevin S.
McKane Joseph K.
W. R. Grace & Co.,-Conn.
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