Dichloro(methyl)(phenyl)silane

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

(Q)SAR

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification

Justification for type of information:

See attached QMRF/QPRF

Principles of method if other than guideline:

The result was obtained using an appropriate QSAR method (see attached QMRF and QPRF for details).

The model is an adaptation of the existing SRC model MPBPVPWIN v 1.43, which is a component of the EPI Suite. This existing model is based on fragment values. That is, the chemical structure is broken down into its constituent functional groups, and the contribution of each group toward the overall boiling point is calculated. Certain correction factors may also apply. Whilst this method is good in principle, the model was developed using a wide range of organic chemicals and only a few organosilicon compounds. Therefore, a validation procedure was undertaken to assess the applicability of the model to chlorosilane compounds. It was noted that the MBBPVPWIN model gave a systematic error; therefore, the current model was developed to correct this. The current model is a linear regression based QSAR, with the boiling point prediction from MPBPVPWIN as the descriptor. The adapted model applies to chlorosilanes.

Boiling pt.:

204 °C

Atm. press.:

1 013 hPa

Boiling pt.:

477 K

Atm. press.:

1 013 hPa

Conclusions:

A boiling point value of 204°C (477 K) at 1013 hPa was obtained using an accepted calculation method. The result is considered to be reliable.

Description of key information

Boiling Point: 204°C at 1013 (QSAR)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

204 °C

Additional information

There is no reliable measured boiling point study for the registered substance. A boiling point value of 204°C at 1013 hPa was predicted for the substance using a validated QSAR estimation method. The result is considered to be reliable and is selected as key study.

In a handbook or collections of reliable data, boiling point value of ≥206 to ≤207°C at 1013 hPa was reported for the substance.

In a secondary source to which reliability could not be assigned, boiling point value of 205°C at 1013 hPa was reported for the substance. r