Registration Dossier
Registration Dossier
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EC number: 412-060-9 | CAS number: 136210-32-7 DESMOPHEN VP-LS 2973 E; DESMOPHEN VP-LS 2975 E; DESMOPHEN VP-LS 2985 E
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
The stability of aspartic acid, N,N'-[methylenebis(2-methyl-4,1-cyclohexanediyl)]bis-, 1,1',4,4'-tetraethyl ester towards hydrolysis was determined according to the OECD-guideline 111. Based on kinetic parameters, the following dissipation half-lives for a temperature of 25 °C were extrapolated based on the Arrhenius equation:
pH 4 (25 °C): t1/2: 655 h
pH 7 (25 °C): t1/2: 25.4 h
pH 9 (25 °C): t 1/2: 16.8 h
Bis-aspartic-mono-acid triethylester, bis-aspartic-di-acid diethylester, bis-aspartic-tri-acid monoethylester and bis-aspartic-tetra-acid of aspartic acid, N,N'-[methylenebis(2-methyl-4,1-cyclohexanediyl)]bis-, 1,1',4,4'-tetraethyl ester could be determined as hydrolysis products by the means of an HPLC-MS method.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 25.4 h
- at the temperature of:
- 25 °C
Additional information
According to the OECD-guideline 111, the stability of the test substance was experimentally determined at three different pH values (pH 4, 7 and 9) for two temperatures (35 °C and 50 °C), but prevailing temperatures in the environment and during ecotoxicological as well as toxicological assays will normally be lower. Thus, to adequately assess the behaviour of the test substance under these circumstances, the dissipation half-life was extrapolated for a temperature of 25 °C. Based on these results it can be stated that aspartic acid, N,N'[methylenebis(2 -methyl-4,1-cyclohexanediyl)]bis-, 1,1',4,4'- tetraethyl ester is stable under acidic conditions, whereas the dissipation half-life decreases with increasing pH-values.
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