[1,1'-Biphenyl]-2,2'-diol, 3,3',5,5'-tetramethyl-

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Test material

Test material information

Constituent 1

Reference substance name:

3,3',5,5'-tetramethyl-[1,1'-biphenyl]-2,2'-diol

EC Number:

607-957-9

Cas Number:

26567-10-2

Molecular formula:

C16 H18 O2

IUPAC Name:

3,3',5,5'-tetramethyl-[1,1'-biphenyl]-2,2'-diol

Results and discussion

Boiling point

Boiling pt.:

> 341 °C

Atm. press.:

1 013 hPa

Decomposition:

yes

Decomp. temp.:

>= 341 °C

Remarks on result:

other: The decomposition takes place under air atmosphere.

Any other information on results incl. tables

The boiling point was tried to be determined by differential scanning calorimetry (DSC). A visual determination using a Büchi melting point apparatus was also applied. In the preliminary DSC screening an endothermic boiling peak was detected in a temperature range of 370°C to 390°C.

The DSC test was performed with a heat flux differential scanning calorimeter.

Parameters	Test 1 / Pre-Test	Test 2	Test 3
System	DSC 821	DSC 821	DSC 821
Start Temp. [°C]	320	320	320
Rate (heating 1) [K/min]	10	10	10
End Temp. [°C]	420	420	420
Crucible type	aluminium, high	aluminium, high	aluminium, high
Open / Sealed	open (perforated)	open (perforated)	open (perforated
Test atmosphere	air	air	air
Air pressure	ambient	ambient	ambient
Amount [mg]	12.96	19.80	30.82
Mass loss [mg] / [%]	12.07 / 93	18.50 / 93	28.86 / 94

 

The solid test item was weighed into an aluminium crucible and was measured against a sealed reference aluminium crucible filled with 12.89 mg aluminium oxide. The sample crucible was sealed with a perforated lid at ambient atmosphere (air) and then the test program was started. For the visual test using the Büchi melting point tester a small amount of the solid test item was filled into a melting point capillary and measured directly.

The measured boiling points of the test item show a very high standard deviation. In addition to this the thermograms of the test item are irreproducible, some of them with shoulders at the side of the boiling peak. Due to these observations a visual test using a Büchi melting point tester was performed. In the Büchi apparatus a capillary containing the test item was heated from 300°C to 375°C at a heating rate of 2 K/min. The test item directly melted on inserting the capillary into the apparatus. With heating formation of bubbles in the test item was observed (beginning boiling process) accompanied by a change of the colour of the test item from beige to black. As the mass loss shows, almost the total amount of the test item is evaporated from the aluminium crucible in this process.

Result:

The boiling point of the test item could not be determined. The boiling process was accompanied by thermal decomposition starting at a minimum temperature of 341°C.

   

Applicant's summary and conclusion

Conclusions:

The boiling point of the test item could not be determined. The boiling process was accompanied by thermal decomposition starting at a minimum
temperature of 341°C.