Selenium dioxide
ALDRICH/325473 - reagent grade, powder, 98%
Synonym: NSC 56753; Selenium oxide
CAS Number: 7446-08-4
Empirical Formula (Hill Notation): O2Se
Molecular Weight: 110.96
EC Number: 231-194-7
MDL Number: MFCD00003562
Linear Formula: SeO2
Product Type: Chemical
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 325473-500G
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 325473-100G
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 325473-5G
| assay | 98% |
| color | off-white to pink |
| form | powder |
| grade | reagent grade |
| InChI | 1S/O2Se/c1-3-2 |
| InChI key | JPJALAQPGMAKDF-UHFFFAOYSA |
| mp | 315 °C (subl.) (lit.) |
| Quality Level | 200  |
| reaction suitability | reagent type: oxidant |
| SMILES string | O=[Se]=O |
| vapor pressure | 1 mmHg ( 157 °C) |
| Application: | Selenium dioxide (SeO2) is mainly used to oxidize the α-methylene carbon atoms adjacent to a double bond to form allylic hydroxy derivatives. Other applications: • SeO2 reacts with olefins in the presence of tert-butyl hydrogen peroxide to form allylic alcohols without the formation of rearrangement or dehydration by-products. This reagent system is also useful for the oxidation reactions of acetylenic fatty esters. • SeO2 can be used for the oxidation of 1,3,5-cycloheptatriene to form tropone. • Piperidoindole systems on oxidation with SeO2 forms either 2-acyl- or 3-acyl-indoles or fully aromatic β-carbolines, depending on the starting material. • SeO2 reacts with chlorotrimethylsilane to form selenium oxychloride in situ, which is an effective chlorinating reagent for alcohols. This reagent is a better alternative to thionyl chloride and other chlorinating agents. |
| Packaging: | 5, 100, 500 g in glass bottle |
| Symbol |    GHS06,GHS08,GHS09 |
| Signal word | Danger |
| Hazard statements | H301 + H331 - H373 - H410 |
| Precautionary statements | P273 - P301 + P310 + P330 - P304 + P340 + P311 - P314 |
| Hazard Codes | T,N |
| Risk Statements | 23/25-33-50/53 |
| Safety Statements | 20/21-28-45-60-61 |
| RIDADR | UN 3283 6.1 / PGIII |
| WGK Germany | WGK 2 |
| Flash Point(F) | Not applicable |
| Flash Point(C) | Not applicable |
| Purity | 98% |
| mp | 315 °C (subl.) (lit.) |
| UNSPSC | 12352303 |