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EC number: 429-600-4
CAS number: 1026988-42-0
In contact with water the substance will not hydrolyse at pH=4 and will hydrolyze rapidly at pH=7 and 9.
In water Basazol Yellow 8511-MS dissociates
into i) two molecules methane sulfonate (CAS 75-75-2) and ii) one
Methane sulfonate is an NLFG (no labile
functional group) compound and hence not susceptible to hydrolysis
(Kollig et al., 1993).
The two key studies were conducted with the
structurally related substance Basazol Yellow 8511 (CAS 118208-02-9)
which is the the analogue chloride salt.
At pH=4 and 50 °C less than 10 % hydrolysis
occurred which means: t0.5 > 1y at 25 °C. Therefore no further
hydrolysis tests at pH=4 were necessary according to OECD111.
At pH=7 and 25 °C t0.5 was already clearly
below 24 h. Therefore a precise determination of t0.5 was not necessary
according to directive 67/548/EWG.
The hydrolysis rates of aromatic esters
generally increase with increasing pH (Mabey & Mill, 1978). At pH=9 and
25 °C t0.5 has to be even lower than at pH=7. Therefore a precise
determination of t0.5 was not necessary.
Apart from the two esterbonds which
are susceptible to hydrolysis at pH 7 and 9 (see above) the molecule
does not contain hydrolysable functional groups. Hence the two
hydrolysis products which were formed are: i) the aromatic diazo core
with two carboxylic groups, ii) 2-dimethylaminoethanol (CAS 108-01-0).
The aromatic diazo core is not
susceptible to further hydrolysis. 2-dimethylaminoethanol (CAS 108-01-0)
is stable against hydrolysis (Harris, 1990; Kollig et al., 1993; Wolfe &
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