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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Description of key information

According to REACH regulation - Annex IX - Chapter 7.16 - Column 2 a dissociation constant study does not need to be conducted if the substance is hydrolytically unstable at pH 4, 7 and 9 (half-life less than 12 hours). The half live rates are <2h at any measured pH in a OECD111 study (s. IUCLID chapter 5.1.2). Therefore the test could not be performed. Instead a dissociation constant with the hydrolytical product Tripropenyl succinic acid was determined.
The calculated pKa values of Tripropenyl succinic acid at 25°C are:
pKa1 (BH- + H+ ⇌ BH2): 5.14 ± 0.19
pKa2 (B-- + H+ ⇌ BH-): 4.34 ± 0.23

Key value for chemical safety assessment

pKa at 20°C:
5.14

Additional information

According to REACH regulation - Annex IX - Chapter 7.16 - Column 2 a dissociation constant study does not need to be conducted if the substance is hydrolytically unstable at pH 4, 7 and 9 (half-life less than 12 hours). The half live rates are <2h at any measured pH in a OECD111 study (s. IUCLID chapter 5.1.2). Therefore the test could not be performed. Instead a dissociation constant with the hydrolytical product Tripropenyl succinic acid was determined.

The calculated pKa values of Tripropenyl succinic acid at 25°C are:

pKa1 (BH- + H+ ⇌ BH2): 5.14 ± 0.19

pKa2 (B-- + H+ ⇌ BH-): 4.34 ± 0.23