C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
31/48, 260/247.3
C23F 11/14 (2006.01) C07D 295/14 (2006.01) C07D 295/145 (2006.01)
Patent
CA 1251792
ABSTRACT OF THE DISCLOSURE Benzoyl alanines of the formula Image (I) in which R1 and R2 can be the same or different and represent hydrogen or an alkyl radical containing from 1 to 12 carbon atoms and R3 and R4 can be the same or different and represent hydrogen, an unbranched or branched alkyl radical containing from 1 to 10 carbon atoms, hydroxyalkyl, alkoxyalkyl, carboxyalkyl or alky- laminoalkyl radicals containing from 1 to 3 carbon atoms in the alkyl radicals and wherein R3 and R4 together can be the -CH2CH2-0-CH2CH2- group or the -CH2CH2CH2CH2CH2- group which form with the nitrogen atom the morpholino or the piperidino ring, respec- tively; with the proviso that a) when R1 is hydrogen or methyl and R2 and R3 are hydrogen, R4 cannot represent hydroxyethyl or carboxymethyl, and b) when R1 is hydrogen or methyl and R2 is hydrogen R3 and R4 cannot both represent hydroxyethyl, and c) when R1 and R2 are both hydrogen, R3 and R4 together cannot be a -CH2CH2-0-CH2CH2- or a -CH2CH2CH2CH2CH2- group; and alkali metal ammonium salts thereof with ammonia, mono-, di- and triethanolamine. The above compounds, but without the proviso, are useful as corrosion inhibitors in aqueous solutions.
477038
Geke Juergen
Penninger Josef
Henkel Kommanditgesellschaft Auf Aktien (henkel Kgaa)
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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