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EC number: 245-659-7
CAS number: 23432-62-4
Methyl-N- [3-(trimethoxysilyl)propyl]carbamate (CAS 23432-62-4) exhibits
a low vapour pressure and low volatility, indicating that the substance
does not tend to evaporate from the water surface. Therefore,
photodegradation in air is not a main degradation pathway. Nevertheless,
if emitted into the air, methyl-N- [3-(trimethoxysilyl)propyl]carbamate
(CAS 23432-62-4) will be rapidly photodegraded (estimated half-life of
0.94 days for indirect photodegradation, OH-radicals). Once released
into the water phase, hydrolysis contributes significantly to the
degradation of this substance. The substance has a two-step hydrolysis.
The rate of formation of the first hydrolysis product, methyl-N-[3
(trihydroxysilyl)propyl]carbamate is relatively fast (half-life 3 h at
room temperature and pH 7). However, the rate of formation of the
ultimate hydrolysis products, (3 aminopropyl)silanetriol plus methanol
and CO2, is extremely slow. Hydrolysis rates (half-life, 25° C, pH 7) of
carbamates is reported to vary from a few seconds to 105 years; for a
primary carbamate with two alkyl substituents (as is the case for this
substance), the rate is likely to be towards the upper end of this
range. Methyl-N- [3-(trimethoxysilyl)propyl]carbamate (CAS 23432-62-4)
and its silanol hydrolysis product exhibit a low potential for
adsorption considering the low log Kow values (< 3).
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