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EC number: 205-746-2
CAS number: 149-74-6
[dichloro(methyl)(phenyl)silane]: Not relevant due to very rapid
hydrolysis in contact with water
[methylphenylsilanediol]: ca. 12
The requirement to test the
substance for dissociation constant is waived because in contact with
water the substance hydrolyses very rapidly. The hydrolysis products in
this case are methylphenylsilanediol and hydrochloric acid. There are no
reliable measured data for the dissociation constant of
methylphenylsilanediol. The typical dissociation constants for the
hydroxyl protons of silanediols are available from studies in other
silanediols. It is appropriate to read-across dissociation constant data
for methylphenylsilanediol from dimethylsilanediol. This suggests that
silanols are not expected to undergo significant dissociation within the
range of pH relevant in the environment or in vivo.
Dimethylsilanediol is reported in a secondary source to have a first
dissociation constant of 11.9. Additional information is given in a
supporting report (PFA 2013b) attached in Section 13.
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