2-Butene, 1,1,4,4-tetramethoxy-

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

reference to same study

Cross-reference 2

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1990

Report date:

1991

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Principles of method if other than guideline:

The freezing point is defined as the temperature a t which phase transition from liquid to solid state at normal atmospheric pressure takes place.
This temperature ideally corresponds to the temperature at the liquidification point or the melting point.
As the phase transition of many substances takes place over a large temperature range, it is often described as the freezing range.

GLP compliance:

yes

Remarks:

statement of compliance

Type of method:

method to determine freezing temperature

Test material

Test material information

Constituent 1

Reference substance name:

(2E)-1,1,4,4-tetramethoxybut-2-ene; (2Z)-1,1,4,4-tetramethoxybut-2-ene

EC Number:

900-110-7

Cas Number:

5370-08-1

Molecular formula:

C8H16O4

IUPAC Name:

(2E)-1,1,4,4-tetramethoxybut-2-ene; (2Z)-1,1,4,4-tetramethoxybut-2-ene

Details on test material:

- Name of test material (as cited in study report): C4-Diacetale
- Physical state: colourless liquid
- Analytical purity: 97.1%
- Storage condition of test material: In a tightly closed container at room temperature in the dark

Results and discussion

Melting / freezing point

Melting / freezing point 1

Melting / freezing pt.:

23 °C

Decomposition:

no

Melting / freezing point 2

Melting / freezing pt.:

250 K

Decomposition:

no

Any other information on results incl. tables

A duplicate experiment was performed to determine the freezing point /freezing range of C4 -DIACETAL. In the first test, at -228.2 K (-45.0°C) the test substance suddenly solidified, whereafter the temperature of the test substance increased upto 250.0 K (-23.2OC). In a second test , the test substance started to crystallize at 229.7 K (-43.5OC), whereas the test substance was completely solidified at 228.7 K (-44.5OC). The temperature increased upto 251.2 K (-22.0°C). The increase i n temperature of the test substance after solidification is probably caused by the release of energy as the test substance changes from a liquid into a solid. Probably, a slow decrease of temperature brings the test substance in a meta-stable condition (liquid with a temperature beneath its freezing point) which changes into a stable (solid) condition a t a temperature of 228.2 K (-45.0°C) in test 1 and 228.7 K (-44.5°C) in test 2. The mean value for the freezing point was calculated to be 250.6 K (-22.6°C).

Applicant's summary and conclusion

Conclusions:

In conclusion, the freezing point of C4-DIACETAL was determined to be 250 K (-23°C), under the conditions of the test.

Executive summary:

The determination of the freezing point /freezing range of C4 -DIACETAL was based on EEC-Directive A.l (1984) and on OECD Guideline no.102 (1981); "Melting Point/Melting Range". The freezing point of C4 -DIACETAL was determinated to be 250 K (-23°C), under the conditions of the test.