2,3,5-trimethylhydroquinone

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

14.03.2019 - 14.03.2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2019

Report date:

2019

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

GLP compliance:

no

Type of method:

differential scanning calorimetry

Remarks:

+ capillary method

Test material

Test material information

Constituent 1

Reference substance name:

2,3,5-trimethylhydroquinone

EC Number:

211-838-3

EC Name:

2,3,5-trimethylhydroquinone

Cas Number:

700-13-0

Molecular formula:

C9H12O2

IUPAC Name:

2,3,5-trimethylhydroquinone

Test material form:

solid: particulate/powder

Results and discussion

Boiling point

Key result

Boiling pt.:

>= 293 - <= 298 °C

Atm. press.:

1 013 hPa

Decomposition:

yes

Any other information on results incl. tables

The test item shows an endothermic effect in the temperature range of 160 – 190 °C, which can be associated with a melting of the test item (melting point according to the certificate of analysis 171.2 – 171.7 °C). A second endothermic effect was observed in the temperature range of 250 – 310 °C, which can be assigned to a boiling of the test item accompanied by decomposition. No further thermal effects could be observed up to the maximum test temperature of 500 °C.

Table1:    Results of the DSC-measurements

No.	Sample weight / mg	Onset of Effect / °C	Range of effect / °C	Weight loss / mg	Atmospheric pressure / hPa	Remark
1	11.38	173.53 292.69	160 – 190 (endo) 250 – 310 (endo)	11.36	996.4
2	10.73	173.41 297.39	160 – 190 (endo) 250 – 310 (endo)	10.73	996.4

For the correction of the boiling temperature to normal pressure the test item was assigned to chemical group 4 (e.g. Cresols). According to appendix 8.2a correction value φ = 5.65 was used for a temperature of 300 °C.

The lowest measured onset temperature is corrected to the normal pressure to be 293.42°C and the highest onset temperature to be 298.12°C. The corrected temperatures of the boiling point differ more than 0.5 K from their mean value of 295.77°C. The test item has a boiling range under atmospheric pressure (1013 hPa) from 293 °C to 298 °C accompanied by decomposition.

Applicant's summary and conclusion

Conclusions:

Trimethylhydroquinone has a boiling point of 293-298°C at 1013 hPa accompanied by decomposition as determined by differential scanning calorimetry and capillary method.

Executive summary:

The test item Trimethylhydroquinone has a boiling point of 293-298°C at atmospheric pressure (1013 hPa) accompanied by decomposition as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).