Registration Dossier
Registration Dossier
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EC number: 701-118-1 | CAS number: 2156592-54-8
Endpoint summary
Administrative data
Description of key information
Additional information
REGISTRATION SUBSTANCE AND READ-ACROSS
The registration substance Tetrapropenyl succinimido caproic acid (Tetra-PSCA), CAS No. 1424148-99-1 is a structural homologue of Pentapropenyl succinimido caproic acid (Penta-PSCA), CAS No. 1424148-94-6. Both substance are not only structurally very similar they also have a similar Octanol-water partitioning coefficient: Tetra-PSCA Log Kow=3.7 and Penta-PSCA Log Kow=3.6 and comparable vapour pressures and Critical Micelle Concentrations. Therefore it is justified to use substance data from Penta-PSCA for read-across to Tetra-PSCA.
PHOTODEGRADATION
Direct photolysis in air, water and soil
The UV Spectrum of the registration substance shows a small shoulder at >290 nm so that direct photolysis may occur.
Indirect photolysis in air, water and soil
Indirect photolysis via OH radical or ozone reaction is fast (Half-life 0.5 -1d). This means indirect photolysis is a possible fate pathway.
HYDROLYSIS
N-Methyl acetamide, CAS No. 79-16-3 has a half-life of 38000 years (pH7, 25 deg C, Reference: Mabey, W. and Mill, T. 1978. Critical Review of Hydrolysis of Organic Compounds in Water Under Environmental Conditions. J. Phys. Chem. Ref. Data 1978, 7(2): 383-415). Hall et al have compared the rate of the alkaline hydrolysis of cyclic imides e.g. N-Methyl succinimide, CAS No. 1121-07-9 with the rate measured for the corresponding acyclic substance e.g. N-Methyl acetamide. They found equal or slower hydrolysis for the cyclic compound. The registration substance contains a (cyclic) N-alkyl succinimide moiety and it can be concluded that hydrolysis under environmental conditions (pH 4 to 9, 12 deg C) is comparable to N-Methyl acetamide mentioned before. Because of this extremely long half-life a hydrolysis study is not warranted.
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