Synonyms: NSC 56753; Selenium oxide
CAS Number: 2025852
Formula: O2Se
Formula Weight: 110.96
Linear Formula: SeO2
MDL No.: MFCD00003562
Purity: 0.98
Melting Point: 315 C (subl.) (lit.)
EC Number: 231-194-7
UNSPSC Code: 12352000
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.
RTECS: VS8575000
RIDADR: UN 3283 6.1 / PGIII
WGK Germany: 2
R Codes: 23/25-33-50/53
S Codes: 20/21-28-45-60-61
IOD Codes: T,N
Symbol: GHS06, GHS08, GHS09
Signal Word: Danger
Hazard Statements: H301 + H331-H373-H410
Precautionary statements: P261-P273-P301 + P310-P311-P501