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Physical & Chemical properties

Dissociation constant

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Description of key information

pKa of constituents:
2,2'-iminodiethanol (Diethanolamine): pKa = 8.96
2,2-bis(4-hydroxyphenyl)propane (Bisphenol A): pka = 9.6
Mannich Base 1 at 25 °C: pKa 1 = 8.73; pKa 2 = 10.1; pKa 3 = 11.52
Mannich Base 2 (isomer A) at 25 °C: pKa 1 = 7.8; pKa 2 = 9.06; pKa 3 = 10.16; pKa 4 = 12.28
Mannich Base 2 (isomer B) at 25 °C: pKa 1 = 8.38; pKa 2 = 9.05; pKa 3 = 11.07; pKa 4 = 11.81
Mannich Base 3 at 25 °C: pKa 1 = 7.68; pKa 2 = 8.75; pKa 3 = 9.26; pKa 4 = 11.32; pKa 5 = 12.36

Key value for chemical safety assessment

Additional information

2,2'-iminodiethanol (Diethanolamine): pKa = 8.96 (literature value)

2,2-bis(4-hydroxyphenyl)propane (Bisphenol A): pka = 9.6 2 (literature value)

The results of Mannich Bases 1, 2, 3 refer to QSAR calculation.