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Physical & Chemical properties

Partition coefficient

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Description of key information

Log Kow  [tris(isopropenyloxy)(vinyl)silane]: 3.8 at 20°C (QSAR)
Log Kow (vinylsilanetriol): -2.0 at 20°C (QSAR)
Log Kow (aectone) = -0.24

Key value for chemical safety assessment

Log Kow (Log Pow):
3.8
at the temperature of:
20 °C

Additional information

The requirement to test the substance for n-octanol/water partition coefficient is waived because in contact with water the submission substance hydrolyses rapidly to form vinylsilanetriol and propen-2-ol.

The log Kow of the substance and its silanol hydrolysis product have been calculated using validated QSAR estimation methods. The submission substance has a predicted log Kow of 3.8 at 20°C and the silanol hydrolysis product has predicted log Kow of -2.0 at 20°C.

The hydrolysis of [tris(isopropenyloxy)(vinyl)silane] produces vinylsilanetriol and 3 molecules of propen-2-ol. Propen-2-ol is an enol type structure, which is in equilibrium with its keto tautomer, propanone (commonly called acetone). The equilibrium heavily favours the keto form at room temperature. Therefore, the properties of acetone as well as vinylsilanetriol are considered for the chemical safety assessment. Acetone has a reported log Kow of -0.24 (OECD 1999).

Reference:

OECD (1999): SIDS Initial Assessment Report (SIAR) for the 9th SIAM, Paris, France, 29 -30 June 1999, Acetone, CAS 67-64-1.