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ChemicalBook--->CAS DataBase List--->51901-85-0

51901-85-0

51901-85-0 Structure

51901-85-0 Structure
IdentificationBack Directory
[Name]

2-BROMO-1,3,2-BENZODIOXABOROLE
[CAS]

51901-85-0
[Synonyms]

B-BROMOCATECHOLBORANE
Catechol boron bromide
beta-Bromocatecholborane
B-Bromocatecholborane>
o-Phenylene bromoboronate
B-Bromocatecholborane
2-bromo-1,3,2-benzodioxaborale
2-BROMO-1,3,2-BENZODIOXABOROLE
1,3,2-Benzodioxaborole, 2-bromo-
2-broMobenzo[d][1,3,2]dioxaborole
2-Bromo-1,3,2-benzodioxaborole 97%
2- Bromo -1,3,2- benzodioxo-boron heterocycle pentene
2-Bromo-1,3,2-benzodioxaborole,B-Bromocatechol-borane
[Molecular Formula]

C6H4BBrO2
[MDL Number]

MFCD00013341
[MOL File]

51901-85-0.mol
[Molecular Weight]

198.81
Chemical PropertiesBack Directory
[Melting point ]

51-53 °C(lit.)
[Boiling point ]

76 °C9 mm Hg(lit.)
[density ]

1.67±0.1 g/cm3(Predicted)
[Fp ]

107 °F
[storage temp. ]

−20°C
[solubility ]

sol dichloromethane
[form ]

powder to lump
[color ]

White to Amber to Dark purple
[BRN ]

2445073
[CAS DataBase Reference]

51901-85-0
Safety DataBack Directory
[Hazard Codes ]

C
[Risk Statements ]

14-34-37
[Safety Statements ]

26-36/37/39-45
[RIDADR ]

UN 2925 4.1/PG 2
[WGK Germany ]

3
[F ]

8-10-21
[HS Code ]

2931.90.6000
[HazardClass ]

4.1
[PackingGroup ]

III
Hazard InformationBack Directory
[Uses]

B-Bromocatecholborane is a mild Lewis acid capable of selective cleavage of ether, ester and carbamate protecting groups; catalyst for Diels-Alder reactions.
[Preparation]

B-Bromocatecholborane can be conveniently prepared by treating Catechol with Boron Tribromide. The reagent is isolated by distillation as a moisture-sensitive, low-melting solid.
[storage]

B-Bromocatecholborane is a flammable solid, moisture sensitive; may be conveniently stored and dispensed as a 0.2 M solution in dichloromethane. If properly protected from moisture, these solutions are stable for a period of months[1]. Use in a fume hood.
[Purification Methods]

Keep at 20o/15mm for some time and then fractionally distil. [Gerrard J Chem Soc 1529 1959, Beilstein 6 IV 5612.]
[References]

1. Boeckman Jr., R. K.; Potenza, J. C. TL 1985, 26, 1411.
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