N-[2,5-dichloro-4-(1,1,2,3,3,3-hexafluoropropoxy)-phenyl-aminocarbonyl]-2,6-difluorobenzamide

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

26 Jan 2000 to 10 Mar 2000

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

Jul 1995

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Version / remarks:

Dec 1992

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

Version / remarks:

Aug 1996

GLP compliance:

yes

Type of method:

differential scanning calorimetry

Key result

Atm. press.:

99.7 hPa

Decomposition:

yes

Decomp. temp.:

ca. 242 °C

Remarks on result:

other:

Remarks:

The test substance decomposes before the boiling point is reached at a temperature of about 242 °C. A determination of the boiling point is, therefore, not possible.

The following results were observed for the experiments described in the material and method section:

1. A boiling point of 110.3 °C was determined.

2. A boiling point of 264.4 °C was determined. After the determination a yellow discoloration of the sample was visible.

3. A boiling point of 287.7 °C was determined. After the determination a yellow discoloration of the sample was again visible.

4. Boiling points of 265.8 °C and 269.2 °C were determined. After both determinations a yellow discoloration of the sample was visible.

5. In air, decomposition was observed to commence at about 242 °C, with a peak maximum of about 332 °C. Massive decomposition begins at about 359 °C.

Under nitrogen, a similar curve was obtained. This indicates that the nature of the decomposition must be thermal. In neither curve was any evidence of boiling observed.

6. A boiling point of 110.0 °C was determined. Using the measured atmospheric pressure, 99.7 kPa, the temperature correction factors given in the OECD guideline number 103, the Sidney-Young number-value-equation, and the boiling point of toluene at standard pressure, it was possible to calculate the corrected boiling point, 110.0 °C, of toluene at the measured atmospheric pressure. The experimentally determined average boiling point of toluene, 110.2 °C, agreed well with this calculated, corrected value.

Conclusions:

The test substance decomposes before the boiling point is reached at a temperature of about 242 °C. A determination of the boiling point is, therefore, not possible.

Executive summary:

The boiling point of the test substance was determined according to OECD TG 103 following GLP principles. The determination was performed using the method used is that of Siwoloboff: the boiling point could be automatically registered using photocell detection. A Mettler FP90 central processor and a FP81HT MBC cell were used in accordance with the manufacturer’s operating instructions. All experiments indicated discoloration of the sample after the determination of the boiling point. In order to interpret these observations with the test substance, additional investigations were performed using differential scanning calorimetry (DSC). A Perkin Elmer 7 Series Thermal Analysis System was used. The thermal behaviour of the test substance was investigated, not only in air, but also under a nitrogen atmosphere using a heating rate of 10.0 °C / minute and starting from 25.0 °C.

In air, decomposition was observed to commence at about 242 °C, with a peak maximum of about 332 °C. Massive decomposition begins at about 359 °C. Under nitrogen, a similar curve was obtained. This indicates that the nature of the decomposition must be thermal. In neither curve was any evidence of boiling observed.

It is concluded that the test substance decomposes before the boiling point is reached at a temperature of about 242 °C. A determination of the boiling point is, therefore, not possible.

Description of key information

The test substance decomposes before the boiling point is reached at a temperature of about 242 °C. A determination of the boiling point is, therefore, not possible. OECD TG 103, differential scanning calorimetry, Das 2000

Key value for chemical safety assessment

Temperature of decomposition (state purity):

242 °C