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EC number: 236-406-1
CAS number: 13355-96-9
HYDROLYSIS AT PH 4.0, 7.0, and 9.0:
- All samples did not show significant changes in the 119Sn-NMR Spectrum
- The half-life time of the substance under the conditions of the study
was > 1 year.
- The substance is considered as hydrolytically stable at pH 4, 7, 9
- The signals propose a dimeric tetraorganodistannoxane structure. Those
structures are formed following a stepwise hydrolysis of initially
formed diorganotin hydroxides.
HYDROLYSIS AT PH 1.2
- The 119Sn-NMR spectrum of the organic extract shows a decrease of the
products peak and an increase of the breakdown product, the monochloride
of the substance DOT(-Neo)Cl.
- The 119Sn-NMR spectrum shows only one signal in pH 1.2 not any longer
the typical signal for dimeric MBTO (distannoxane). The single signal
can be assigned to monomeric monobutylstannonic acid.
The hydrolysis of the test material as a function of pH was investigated
in accordance with the standardised guidelines OECD 111 and EU Method
The stability of the test material was investigated at pH 4, 7 and 9 and
pH 1.2 using NMR spectroscopy.
The study shows that the test material is hydrolytically stable at pH 4,
7, 9. After 5 days of hydrolysis at 50°C less than 10%
of the test material was hydrolysed (half life at 25°C > 1 year).
Under simulated gastric conditions (0.1 M HCl /pH 1.2 /40°C/ 4 h) the
119Sn-NMR spectrum shows only one signal in pH 1.2 not any longer the
typical signal for dimeric MBTO (distannoxane). The single signal can be
assigned to monomeric monobutylstannonic acid.
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