BENZENESELENINIC ANHYDRIDE Chemical Properties

Melting point:

165-170 °C (lit.)

Boiling point:

184.2±23.0 °C(Predicted)

form 

solid

Sensitive 

Moisture Sensitive

BRN 

2332406

CAS DataBase Reference

17697-12-0(CAS DataBase Reference)

Safety Information

Hazard Codes 

T,N

Risk Statements 

23/25-33-50/53

Safety Statements 

20/21-28-45-60-61

RIDADR 

UN 3283 6.1/PG 2

WGK Germany 

3

F 

3-10-21

HazardClass 

6.1

PackingGroup 

III

HS Code 

29310099

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

BENZENESELENINIC ANHYDRIDE Usage And Synthesis

Chemical Properties

WHITE TO LIGHT BEIGE POWDER

Uses

Benzeneseleninic acid anhydride was used to oxidize hydrazines to afford azo-compounds.

General Description

Oxidation of phenols by benzeneseleninic acid anhydride yields ortho-quinones. Benzeneseleninic anhydride acts as a mild oxidant for the conversion of benzylic hydrocarbons into aldehydes or ketones.

Purification Methods

When the anhydride is recrystallised from *C6H6 it has m 124-126o, but when this is heated at 140o/1hour in a vacuum or at 90o/2hours it has m 164-165o and gives a solid m 124-126o when then recrystallised from *C6H6. Both depress the melting point of the acid PhSeO2H. If the high melting anhydride is dissolved in *C6H6 and seeded with the high melting anhydride, the high melting anhydride crystallises out. It readily absorbs H2O to form the acid (PhSeO2H, m 122-124o). Because of this the commercial anhydride could contain up to 30% of the acid. It is best purified by converting to the HNO3 complex (m 112o) and heating this in vacuo at 120o/72hours to give the anhydride as a white powder m 164-165o. Alternatively heat the anhydride in vacuo at 120o/72 hours until the IR shows no OH band. [Ayvrey et al. J Chem Soc 2089 1962, Barton et al. J Chem Soc, Perkin Trans 1 567 1977, Beilstein 11 H 422, 11 I 110, 11 III 716, 11 IV 708.] TOXIC solid.

BENZENESELENINIC ANHYDRIDE(17697-12-0)Related Product Information

• PHENYLSELENOL
• Trimellitic Anhydride
• BENZENESELENINIC ACID
• HYDROGEN SELENIDE
• BENZENESELENINIC ANHYDRIDE
• METHANESELENINIC ACID
• Selenium
• methaneselenol
• BENZENESELENIC ANHYDRIDE