Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Two reliable proprietary studies for the isomer 2-methylbut-2-ene (CAS 513-35-9) show that the substance is not readily biodegradable. No other reliable studies were identified. Since isoamylene (2-methylbutene, CAS 26760-64-5) is a mixture of the two isomers, 2-methylbut-2-ene (CAS 513-35-9) and 2-methylbut-1-ene (CAS 563-46-2) and in the absence of any reliable data for isoamylene the data for the isomer (CAS 513-35-9) are considered suitable for read-across.

Structural analysis indicates that the substance is not expected to undergo hydrolysis due to the lack of hydrolysable functional groups. Based on a log Kow of 2.67 the substance is not expected to bioaccumulate in the environment or absorb strongly to soil or sediment. Accordingly, the endpoints BCF and Koc can be waived.