BENZENESELENINIC ACID
- CAS NO.:6996-92-5
- Empirical Formula: C6H6O2Se
- Molecular Weight: 189.07
- MDL number: MFCD00002100
- EINECS: 230-271-2
- SAFETY DATA SHEET (SDS)
- Update Date: 2023-06-08 17:06:38
What is BENZENESELENINIC ACID?
Chemical properties
white to beige crystalline powder or needles
The Uses of BENZENESELENINIC ACID
Benzeneseleninic acid was used as catalyst during the oxidation of sulfides to sulfoxides via ligand coupling on the iodine atom. It was also used in the preparation of 3-methoxy-17a-oxa-D-homoestra-l,3,5(10)-trien-17-one.
General Description
Benzeneseleninic acid oxidizes hydrazine or 1,2-disubstituted derivatives to corresponding diazenes.
Safety Profile
Reacts violently with hydrazinederivatives (e.g., benzohydrazide). When heated todecomposition it emits toxic fumes of Se.
Purification Methods
Add 10% excess of 15M NH3 to the solid acid and stir until the solid dissolves, filter, decolorise with charcoal (2x, Norite) and acidify by slow addition of 6M HCl, filter the solid off and wash it with H2O. Dissolve the acid in the minimum volume of MeOH, and this solution is added dropwise to boiling H2O until cloudiness appears. At this point add 25% more boiling H2O, filter hot (decolorise if necessary) and cool rapidly, with scratching, to 0o. After 30minutes the solid is filtered off and recrystallised as before but with very slow cooling. The colourless needles are filtered off and dried in a vacuum desiccator (CaCl2) before the melting point is measured [McCullough & Gould J Am Chem Soc 71 674 1949]. The HNO3 complex has m 112o. [Beilstein 11 H 422, 11 I 110, 11 III 716.]
Properties of BENZENESELENINIC ACID
Melting point: | 121-124 °C (lit.) |
Boiling point: | 114.4±23.0 °C(Predicted) |
Density | 1.9300 |
Water Solubility | Slightly soluble in water |
pka | pK1:4.79 (25°C) |
form | solid |
color | Plates from water |
BRN | 1929765 |
CAS DataBase Reference | 6996-92-5(CAS DataBase Reference) |
Safety information for BENZENESELENINIC ACID
Signal word | Danger |
Pictogram(s) |
Skull and Crossbones Acute Toxicity GHS06 Health Hazard GHS08 Environment GHS09 |
GHS Hazard Statements |
H373:Specific target organ toxicity, repeated exposure H410:Hazardous to the aquatic environment, long-term hazard |
Precautionary Statement Codes |
P260:Do not breathe dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P273:Avoid release to the environment. P314:Get medical advice/attention if you feel unwell. P301+P310:IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. |
Computed Descriptors for BENZENESELENINIC ACID
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