Ethyl 1,3-dihydro-1,3-dioxo-2H-isoindole-2-carboxylate

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 02 May 2016 to 24 June 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

2008

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

1998

Deviations:

no

GLP compliance:

yes

Type of method:

differential scanning calorimetry

Test material

Test material information

Constituent 1

Reference substance name:

Ethyl 1,3-dihydro-1,3-dioxo-2H-isoindole-2-carboxylate

EC Number:

245-048-5

EC Name:

Ethyl 1,3-dihydro-1,3-dioxo-2H-isoindole-2-carboxylate

Cas Number:

22509-74-6

Molecular formula:

C11H9NO4

IUPAC Name:

ethyl 1,3-dioxo-2,3-dihydro-1H-isoindole-2-carboxylate

Test material form:

solid

Details on test material:

- Appearance: white solid
- Storage conditions of test material: in refrigerator (2-8°C)

Results and discussion

Melting / freezing point

Key result

Melting / freezing pt.:

79 °C

Decomposition:

yes

Decomp. temp.:

175 °C

Any other information on results incl. tables

TGA EXPERIMENT (PRELIMINARY TEST)

From 200°C upwards the weight of the sample decreased significantly. At 302°C the sample weight had decreased by 25%. After the experiment, a colourless molten residue remained in the sample container (original colour: white).

DSC EXPERIMENT 1

An endothermic peak between 50°C and 100°C was observed. The extrapolated onset temperature of the peak was 79.57°C. The effect was most likely obtained due to melting of the test item. An exothermic deviation from the baseline was observed from 175°C followed by the start of an endothermic effect. After the experiment, an off-white molten residue remained in the sample container. The change of the colour indicated that the effects were due to reaction and/or decomposition of the test item.

DSC EXPERIMENT 2

To investigate the melting peak between 50°C and 100°C a repeated heating cycle was applied. With the first heating the extrapolated onset temperature of the melting peak was 79.33°C. During cooling an exothermic peak was observed between 50°C and 70°C. The effect was obtained due to crystallization of the test item. With the second heating two endothermic effects were observed. The first peak had an extrapolated onset temperature of 78.51°C, the second peak had a peak maximum of 90.42°C. The results demonstrated that the endothermic effect was due to melting of the test item. After the experiment, an off-white molten residue remained in the sample container.

The melting temperature was determined as the average melting temperature obtained from Experiment 1 (79.57°C) and Experiment 2 (79.33°C).

Applicant's summary and conclusion

Conclusions:

The melting temperature of the substance Carbaethoxyphthalimid was determined to be 79°C.

Executive summary:

Differential Scanning Calorimetry (DSC) experiments were performed in a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200. The melting temperature of the substance Carbaethoxyphthalimid was determined to be 79°C. Reaction and/or decomposition was observed at temperatures above 175°C.