Registration Dossier
Registration Dossier
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EC number: 425-220-8 | CAS number: 5945-33-5
Dissociation constant
Administrative data
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2 November 1998 to 27 November 1998.
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study performed in accordance with OECD test guidelines in compliance with GLP.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 999
- Report date:
- 1999
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 112 (Dissociation Constants in Water)
- Deviations:
- no
- GLP compliance:
- yes
Test material
- Reference substance name:
- -
- EC Number:
- 425-220-8
- EC Name:
- -
- Cas Number:
- 5945-33-5
- Molecular formula:
- C39H34O8P2
- IUPAC Name:
- 4-(2-{4-[(diphenoxyphosphoryl)oxy]phenyl}propan-2-yl)phenyl diphenyl phosphate; 4-{2-[4-({[4-(2-{4-[(diphenoxyphosphoryl)oxy]phenyl}propan-2-yl)phenoxy](phenoxy)phosphoryl}oxy)phenyl]propan-2-yl}phenyl diphenyl phosphate
Constituent 1
Results and discussion
- Dissociating properties:
- no
Dissociation constant
- Remarks on result:
- other: CN-1985 was found not to dissociate below pH 11
Any other information on results incl. tables
No dissociation of CN-1985 was observed over the environmentally significant pH range. pKa is not provided in the report on this basis.
Applicant's summary and conclusion
- Conclusions:
- CN-1985 was found not to dissociate below pH 11. No dissociation was observed over the environmentally significant pH range. pKa is not provided in the report on this basis.
- Executive summary:
A study was performed to investigate the dissociation constant of CN-1985. The method followed is described in the OECD Guidelines for the Testing of Chemicals (Method 112).
The dissociation constant was investigated by the spectrophotometric method, since it was noted that there was a difference between the ultraviolet/visible absorption spectra obtained in both acidic and neutral solutions and those obtained in basic solution.
This method was also considered to be the most appropriate to the investigations since the test substance is poorly soluble in water, and therefore the potentiometric method was not viable.
CN-1985 was found not to dissociate below pH 11. No dissociation was observed over the environmentally significant pH range.
pKa is not provided in the report on this basis.
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