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Environmental fate & pathways

Phototransformation in air

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Description of key information

3-methylcyclohex-4-ene-1,2-dicarboxylic acid (3-MTHPAc D4)
Half-life for reaction with photochemically-produced hydroxyl radicals: 5.9 hours.
Overall degradation rate constant with OH radicals= 5.66E-6 cm3/(molecule-day)

Key value for chemical safety assessment

Half-life in air:
5.9 h
Degradation rate constant with OH radicals:
0 cm³ molecule-1 d-1

Additional information

In the presence of moisture, 1,2,3,6-tetrahydro-3-methylphthalic anhydride is rapidly hydrolysed to the correspondent 3-methylcyclohex-4-ene-1,2-dicarboxylic acid, that is most relevant to various environmental compartments than the submission substance.

The stability of the substances in the atmosphere was calculated using the software AOPWIN (v1.92). It is predicted that both anhydride and acid forms will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals, with a half-life of 5.9 hours, and overall degradation rate constants with OH radicals of 5.66E-6 cm3/(molecule-day).