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8.18631

Sigma-Aldrich

Zinc bromide

anhydrous for synthesis

Synonym(s):

Zinc bromide, Zinc dibromide

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About This Item

Empirical Formula (Hill Notation):
Br2Zn
CAS Number:
7699-45-8
Molecular Weight:
225.20
MDL number:
MFCD00011294
UNSPSC Code:
12352302
EC Index Number:
231-718-4
NACRES:
NA.22

Quality Level

200

form

crystals

pH

4 (20 °C in H2O, saturated solution)

bp

697 °C/1013 mbar

mp

394 °C

solubility

4470 g/L

density

4.2 g/cm3 at 20 °C

storage temp.

2-30°C

InChI

1S/2BrH.Zn/h2*1H;/q;;+2/p-2

InChI key

VNDYJBBGRKZCSX-UHFFFAOYSA-L

Application

Zinc bromide can be used as:
  • A catalyst to synthesize β-hydroxy ketones by stereoselective semipinacol rearrangement of α-hydroxy epoxides.
  • A safe brominating source for the oxidative bromination of alkenes and alkynes in combination with lead tetraacetate.

It can also be used to prepare silica-supported zinc bromide (ZnBr2/SiO2) composite, which is used as a catalyst to synthesize:
  • Ynone derivatives via cross-coupling reaction of acid chlorides with terminal alkynes.
  • 4,5-disubstituted-1,2,3-(NH)-triazole derivatives by one-pot cross-coupling and 1,3-dipolar cycloaddition reaction of acid chlorides, terminal alkynes, and sodium azide.

Analysis Note

Assay (argentometric): ≥ 98.0 %
Water (K. F.): ≤ 2.0 %

Signal Word

Danger

Hazard Statements

H302 - H314 - H317 - H411

Hazard Classifications

Acute Tox. 4 Oral - Aquatic Chronic 2 - Eye Dam. 1 - Skin Corr. 1B - Skin Sens. 1

Storage Class Code

8B - Non-combustible, corrosive hazardous materials

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

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Mild oxidative bromination of alkenes and alkynes with zinc bromide and lead tetraacetate
Muathen HA
Synthetic Communications, 34(19), 3545-3552 (2004)
One-pot synthesis of 4, 5-disubstituted 1, 2, 3-(NH)-triazoles by silica supported-zinc bromide in the aerobic condition
Keivanloo A, et al.
Comptes Rendus Chimie, 16(3), 239-243 (2013)
Silica-supported zinc bromide (ZnBr2/SiO2): a highly efficient heterogeneous catalyst for coupling acid chlorides with terminal alkynes
Keivanloo A, et al.
Tetrahedron Letters, 52(13), 1498-1502 (2011)
Zinc bromide as catalyst for the stereoselective construction of quaternary carbon: improved synthesis of diastereomerically enriched spirocyclic diols
Tu Yong Qiang, et al.
Journal of the Chemical Society. Perkin Transactions 1, (22), 3791-3794 (2000)

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