15678

Boric anhydride

puriss. p.a., ≥98% (T)

• Synonyme(s) : Boron trioxide
• Formule empirique (notation de Hill): B₂O₃
• Numéro CAS: 1303-86-2
• Poids moléculaire : 69.62
• Numéro CE : 215-125-8
• Numéro MDL: MFCD00011315
• Code UNSPSC : 12352300
• ID de substance PubChem : 57647516
• Nomenclature NACRES : NA.21

Propriétés

• Densité de vapeur: >1 (vs air)
• Niveau de qualité: 100
• Qualité: puriss. p.a.
• Pureté: ≥98% (T)
• Forme: solid
• Perte: ≤3% loss on ignition, 900 °C
• Pf: 450 °C (lit.)
• Densité: 2.46 g/mL at 25 °C (lit.)
• Traces d'anions: chloride (Cl^-): ≤20 mg/kg; sulfate (SO₄^2-): ≤50 mg/kg
• Traces de cations: Ag: ≤5 mg/kg; Al: ≤50 mg/kg; Ba: ≤5 mg/kg; Bi: ≤5 mg/kg; Ca: ≤10 mg/kg; Cd: ≤5 mg/kg; Co: ≤5 mg/kg; Cr: ≤5 mg/kg; Cu: ≤5 mg/kg; Fe: ≤5 mg/kg; K: ≤30 mg/kg; Mg: ≤20 mg/kg; Mn: ≤5 mg/kg; Mo: ≤5 mg/kg; Na: ≤200 mg/kg; Ni: ≤5 mg/kg; Pb: ≤30 mg/kg; Sr: ≤5 mg/kg; Tl: ≤10 mg/kg; Zn: ≤5 mg/kg
• Chaîne SMILES: O=BOB=O
• InChI: 1S/B2O3/c3-1-5-2-4
• Clé InChI: JKWMSGQKBLHBQQ-UHFFFAOYSA-N

Description

Description générale

Boric anhydride (Boron trioxide) is a colorless glassy hygroscopic mass having rhombic crystals. Its dissolution in water is a highly exothermic reaction and orthoboric acid is formed. It can be prepared by heating boric acid. It is used as flux in metallurgical processes. It has been reported as an inhibitor of crystallization.

Application

Boric anhydride can be used as a boron precursor to synthesize:

• Boron carbon nitride nanosheet (BCN) by thermal condensation reaction with urea and melamine.
• Boron-doped reduced graphene oxide (B-rGO) via a chemical vapor deposition method.

It can also be used as an additive along with pinacol to synthesize 4-alkoxy-5-hydroxy-2-pentenoate derivatives by Pd-catalyzed reaction of α, β-unsaturated γ, δ-epoxy esters with various alcohols.

Autres remarques

Reagent for the decomposition of silicates by fusion

Informations sur la sécurité

• Pictogrammes: GHS08
• Mention d'avertissement: Danger
• Mentions de danger: H360FD
• Conseils de prudence: P201 - P202 - P280 - P308 + P313 - P405 - P501
• Classification des risques: Repr. 1B
• Code de la classe de stockage: 6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
• Classe de danger pour l'eau (WGK): WGK 1
• Point d'éclair (°F): Not applicable
• Point d'éclair (°C): Not applicable
• Équipement de protection individuelle: dust mask type N95 (US), Eyeshields, Gloves