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Sigma-Aldrich

Boric anhydride

puriss. p.a., ≥98% (T)

Synonym(s):

Boron trioxide

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About This Item

Empirical Formula (Hill Notation):
B2O3
CAS Number:
1303-86-2
Molecular Weight:
69.62
EC Number:
215-125-8
MDL number:
MFCD00011315
UNSPSC Code:
12352300
PubChem Substance ID:
57647516
NACRES:
NA.21

vapor density

>1 (vs air)

Quality Level

100

grade

puriss. p.a.

assay

≥98% (T)

form

solid

loss

≤3% loss on ignition, 900 °C

mp

450 °C (lit.)

density

2.46 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤20 mg/kg
sulfate (SO42-): ≤50 mg/kg

cation traces

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

SMILES string

O=BOB=O

InChI

1S/B2O3/c3-1-5-2-4

InChI key

JKWMSGQKBLHBQQ-UHFFFAOYSA-N

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General description

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.

Other Notes

Reagent for the decomposition of silicates by fusion

pictograms

Health hazard
GHS08

signalword

Danger

hcodes

H360FD

Hazard Classifications

Repr. 1B

Storage Class

6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
0000384358
0000325970
0000315126
0000384358
0000353245

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Palladium-catalyzed stereospecific substitution of alpha,beta-unsaturated gamma,delta-epoxy esters by alcohols with double inversion of configuration: synthesis of 4-alkoxy-5-hydroxy-2-pentenoates.
Xiao-Qiang Yu et al.
Angewandte Chemie (International ed. in English), 47(4), 750-754 (2007-12-12)
Z. Sulcek et al.
Methods of Decomposition in Inorganic Analysis (1989)
R. Bock
Aufschlussmethoden der anorg. & org. Chemie (1972)
Crystallization of gels and glasses made from hot-pressed gels.
Phalippou J, et al.
Journal of Non-Crystalline Solids, 48(1), 17-30 (1982)
Laurie P Volak et al.
Drug metabolism and disposition: the biological fate of chemicals, 36(8), 1594-1605 (2008-05-16)
Curcuminoid extract and piperine are being evaluated for beneficial effects in Alzheimer's disease, among other intractable disorders. Consequently, we studied the potential for herb-drug interactions involving cytochrome P450 (P450), UDP-glucuronosyltransferase (UGT), and sulfotransferase (SULT) enzymes. The curcuminoid extract inhibited SULT
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