Reaction mass of (R*,R*)-7-methoxy-3,7-dimethyl-2-octanol and (R*,S*)-7-methoxy-3,7-dimethyl-2-octanol

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

13 March 2017 - 15 March 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Well documented study performed according to OECD 102 guideline and EU method A.1, under GLP and without deviation

Reason / purpose for cross-reference:

reference to other study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

2017-01-10

Type of method:

differential scanning calorimetry

Melting / freezing pt.:

< -20 °C

Atm. press.:

ca. 991 hPa

Decomposition:

no

Remarks:

No melting point is observed from -20°C

Remarks on result:

other: First determination

Melting / freezing pt.:

< -20 °C

Atm. press.:

ca. 990 hPa

Decomposition:

no

Remarks:

No melting point is observed from -20°C

Remarks on result:

other: Second determination

Key result

Melting / freezing pt.:

< -20 °C

Remarks on result:

other: Final value - Mean of the two determinations

Pre-study:

Peaks assigned to the boiling of the substance were observed and measurement was stopped at 280°C.

Temperatures corresponding to these peaks were used to create the following temperature program:

 

Temperature program:

Step	Initial temperature (°C)	Final Temperature (°C)	Heating rate (°C/min)	Duration (min)	Furnace atmosphere	Rate* (mL/min)	Liquid nitrogen cooling
1	20	-150	10	17	He	60	YES
2	-150	-150	0	15	He	60	YES
3	-150	300	10	45	He	60	NO

*Gas injection rate in the furnace.

First Determination:

Mass taken: 14.70 mg

Results:  

No melting point is observed from -20 °C.

Atmospheric pressure: 991.0 hPa

Second Determination: 

Mass taken: 14.22 mg

Results:

No melting point was observed from -20.0 °C.

Atmospheric pressure: 990.0 hPa

Conclusions:

According to guideline OECD 102 and method EU A.1, no melting point of substance 7-METHOXY-3,7-DIMETHYLOCTAN-2-OL MULTICONSTITUENT was observed from -20°C.

Executive summary:

A study was performed to determine the melting point/range of test item 7 -METHOXY-3,7 -DYMETHYLOCTAN-2 -OL. The method used was Differential Scanning Calorimetry (DSC) and the test was conducted according to Regulation EC No. 440/2008 Method A.1 and OECD Test Guideline 102 , "Melting Point/Melting Range".

In this method, two crucibles were put in the apparatus furnace under inert atmosphere (helium) at atmospheric pressure. One crucible contained the test item, the other was empty and considered as the reference. A specific temperature program was applied. The crucibles were linked to two thermocouples fixed on the TG-DSC sample carrier. Heat flow differences between the two crucibles and mass variation were recorded on a thermogram.

A cooling system using nitrogen allowed experiments with low temperature down to -150°C.

Two trials were conducted and corresponding thermograms were obtained, giving us the following results:

Trial	Melting point/range	Ambient pressure
1	<-20.0 °C	991.0 hPa
2	-<20.0 °C	990.0 hPa

The melting point values respect validity criteria (less than 0.5°C for the melting point).

The melting point of the Indium respects the checking cards limits (156.7 °C for a reference value of 156.6 °C) so as its enthalpy (27.4 J/g for a reference value of 28.6 J/g).

No melting point of substance 7 -METHOXY-3,7 -DIMETHYLOCTAN-2 -OL MULTICONSTITUENT was observed from - 20°C.

Description of key information

Melting point of substance 7-METHOXY-3,7-DIMETHYLOCTAN-2-OL MULTICONSTITUENT is < -20°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

-20 °C

Additional information

Key study conducted according to the OECD 102 Guideline and the EU A.1 method, under GLP without deviation and with certificate of analysis included. Therefore, a reliability of 1 is assigned and the result of this key study is proposed as the end point value.