Registration Dossier
Registration Dossier
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EC number: 203-533-9 | CAS number: 107-93-7
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Reason / purpose for cross-reference:
- reference to same study
- Principles of method if other than guideline:
- Classical method
- Type of method:
- other: not specified
- Key result
- Melting / freezing pt.:
- > 71.5 - < 71.7 °C
- Conclusions:
- The melting point of the test item is 71.5 - 71.7°C.
Reference
Description of key information
The melting point of crotonic acid, pure trans isomer, is about 72 °C.
The melting point of commercial crotonic acid is in the range of 69 - 72 °C
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 72 °C
Additional information
The melting point of Crotonic acid has been reported in a multitude of publications (e.g. www.reaxys.com; Beilsteins Handbuch der Organischen Chemie, etc.).
Typical statements, related to the trans-isomer [CASRN 107-93-7] range from 69°C to 73°C.
Typical statements, related to the unspecific CASRN 3724-65-0 range from 70°C to 73°C.
The melting/freezing point of isocrotonic acid [CASRN 503-64-0] has been reported in the range of about 12.5°C to 16°C.
This leads to the conclusion that the melting point of Crotonic acid, with a very high purity in regard to the trans-isomer, is about 72°C.
Crotonic acid containing a relevant portion of the cis-isomer (isocrotonic acid) should show a significant melting point depression.
Commercially available Crotonic acid, whether related to the CASRN 107-93-7 or to the CASRN 3724-65-0, shows melting points within the narrow range of 69 – 73°C.
This finding clearly indicates that, independent of the CASRN assigned, commercial Crotonic acid is always the same substance, containing only minor quantities, if at all, of the cis-isomer.
Isocrotonic acid [CASRN 503-64-0] is not commercially available.
For these reasons the CASRN 107-93-7 and the related EINECS no. 223-077-4 has been chosen as the key identifiers within this dossier covering all commercial available qualities of Crotonic acid.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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