2,4-dimethyl-4-phenyltetrahydrofuran

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

07 May 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

Principles of method if other than guideline:

Not applicable

GLP compliance:

yes (incl. QA statement)

Type of method:

method according to Siwoloboff

Key result

Boiling pt.:

260 °C

Atm. press.:

101.325 kPa

Accuracy checking

The accuracy of the instrument was checked by determining the melting point of a certified sample of benzoic acid (certified melting point: 122.4°C ± 0.3°C). The results were:

First determination: 122.6°C

Second determination: 122.5°C

 

Boiling point determination

First determination: observed boiling point: 258.7°C

Second determination: observed boiling point: 258.3°C

 

Correction to normalized pressure

The atmospheric pressure at the time of the experiment was 96.79 kPa (Meteo Suisse). A correction of the temperature to normalised pressure (101.325 kPa) was made. The determination of this correction factor was made using the Sidney Young equation, as recommended in OECD guideline 103.

T_n=T+(f_T-Δp)

Where:

Δp = 101.325 kPa — p

p = pressure in kPa; the pressure was obtained from the Swiss meteorological service for the time of the experiment;

f_T= rate of change of boiling temperature with pressure in K/kPa, here a value of 0.45 K/kPa, as published in the OECD guideline 103, was used.

T = temperature in K

T_n= normal boiling point

 

With this correction made, it can be concluded that the standard boiling point of test item is (values rounded off): 534K (260°C).

Executive summary:

The boiling point of test item was measured according to OECD Guideline No. 103, with the Siwoloboff capillary method, and under GLP.

After preliminary testing, two main determinations were performed, at a heating rate of 0.5°C/minute. Results were within precision. The atmospheric pressure at the time of the experiment was 96.79 kPa. A correction of the temperature to normalised pressure (101.325 kPa) was made with the Sidney-Young equation.

The normal boiling point of test item is 260°C (534K).

Description of key information

Experimental boiling point = 260 °C (corrected to normal atmP). (OECD 103, GLP)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

260 °C

Additional information

A fully reliable experimental study, conducted according to a recognized OECD method and under GLP, is available.
It is considered as a key study; the result is retained as key data for CSA.