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S9640

Sigma-Aldrich

Sodium tetraborate decahydrate

ACS reagent, ≥99.5%

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Synonym(s):
Borax decahydrate, Sodium borate decahydrate
Linear Formula:
Na2B4O7 · 10H2O
CAS Number:
Molecular Weight:
381.37
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

grade

ACS reagent

Quality Level

agency

suitable for SM 4500 - NH3

vapor pressure

0.213 hPa ( 20 °C)

assay

≥99.5%

form

powder or crystals

impurities

≤0.005% Insoluble matter

pH

9.15-9.20 (25 °C, 0.01 M in solution)

density

1.73 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤0.001%
phosphate (PO43-): ≤0.001%
sulfate (SO42-): ≤0.005%

cation traces

Ca: ≤0.005%
Fe: ≤5 ppm
heavy metals (as Pb): ≤0.001%

SMILES string

O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]B1Ob2ob([O-])ob(O1)o2

InChI

1S/B4O7.2Na.10H2O/c5-1-7-3-9-2(6)10-4(8-1)11-3;;;;;;;;;;;;/h;;;10*1H2/q-2;2*+1;;;;;;;;;;

InChI key

CDMADVZSLOHIFP-UHFFFAOYSA-N

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1 of 4

This Item
31457B987611625
vibrant-m

S9640

Sodium tetraborate decahydrate

-
vibrant-m

31457

Sodium tetraborate decahydrate

Essential Grade
vibrant-m

B9876

Sodium tetraborate decahydrate

-
vibrant-m

11625

Sodium tetraborate decahydrate

Essential Grade
assay

≥99.5%

assay

≥99.5%

assay

≥99.5%

assay

99.0-103.0%

Quality Level

200

Quality Level

200

Quality Level

200

Quality Level

200

grade

ACS reagent

grade

ACS reagent, puriss. p.a.

grade

-

grade

-

vapor pressure

0.213 hPa ( 20 °C)

vapor pressure

-

vapor pressure

-

vapor pressure

-

pH

9.15-9.20 (25 °C, 0.01 M in solution)

pH

9.0-9.6 (20 °C, 5%)

pH

9.2 (10 g/L)

pH

9.0-9.6 (20 °C, 5%)

General description

Sodium tetraborate decahydrate is a naturally occurring material used as a catalyst or additive for many organic transformations such as Nef reaction, Knoevenagel condensation, substitution, addition, selective methylation of vicinal diols, and desilylation of trimethylsilyl alkynones.

Application

Sodium tetraborate decahydrate can be used as a catalyst in the:
  • Regioselective thiolysis of 1,2-epoxides by using thiols to synthesize β-hydroxy sulfides.
  • Hetero-Michael addition of thiols with electron-deficient olefins to synthesize corresponding β-adducts.
  • Solvent-free Biginelli reaction to synthesize 3,4-dihydropyrimidin-2(1H)-ones.
It can also be used as an additive to prepare polypyrrole-borax composites with high dielectric properties.

Legal Information

pictograms

Exclamation markHealth hazard

signalword

Danger

Hazard Classifications

Eye Irrit. 2 - 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


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