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Description of key information

Estimation of the acid base properties based on the chemical structure.
General Physical Chemistry, Schering AG, Berlin. Study report A11216 (ADP_322), dated 2002-11-21
Hydroxydrospirenone is considered as a neutral molecule in the biologically relevant range of pH 2 to pH 12.

Key value for chemical safety assessment

Additional information

Hydroxydrospirenone does not contain any functional group, except of the aliphatic OH-group, which can be protonated or deprotonated significantly in aqueous solution.

For the aliphatic hydroxyl group a pKa value of 14.0 was calculated with the computer program ACD/pKa DP (Advanced Chemistry Development Inc. Toronto, Canada.

Therefore, Hydroxydrospirenone is to be considered as a neutral molecule in the pH range 2 – 10, which is of relevance for aqueous biological systems.