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792527

Sigma-Aldrich

Imidazole

anhydrous, free-flowing, Redi-Dri, ACS reagent, ≥99%

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Synonym(s):
1,3-Diaza-2,4-cyclopentadiene, Glyoxaline
Empirical Formula (Hill Notation):
C3H4N2
CAS Number:
Molecular Weight:
68.08
Beilstein:
103853
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

grade

ACS reagent
anhydrous

Quality Level

vapor pressure

<1 mmHg ( 20 °C)

product line

Redi-Dri

Assay

≥99%

form

solid

quality

free-flowing

impurities

≤0.2% water

ign. residue

≤0.1%

pH

9.5-11.0 (25 °C, 5% in H2O)

pKa (25 °C)

6.95

bp

256 °C (lit.)

mp

88-91 °C (lit.)

cation traces

Fe: ≤0.001%

SMILES string

c1c[nH]cn1

InChI

1S/C3H4N2/c1-2-5-3-4-1/h1-3H,(H,4,5)

InChI key

RAXXELZNTBOGNW-UHFFFAOYSA-N

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1 of 4

This Item
I2399I025056749
Imidazole anhydrous, free-flowing, Redi-Dri&#8482;, ACS reagent, &#8805;99%

Sigma-Aldrich

792527

Imidazole

-
Imidazole ACS reagent, &#8805;99% (titration)

Sigma-Aldrich

I2399

Imidazole

-
Imidazole &#8805;99% (titration), crystalline

Sigma-Aldrich

I0250

Imidazole

-
Imidazole BioUltra, &#8805;99.5% (GC)

Sigma-Aldrich

56749

Imidazole

Premium Grade
form

solid

form

-

form

crystalline

form

powder or crystals

bp

256 °C (lit.)

bp

256 °C (lit.)

bp

256 °C (lit.)

bp

256 °C (lit.)

mp

88-91 °C (lit.)

mp

88-91 °C (lit.)

mp

88-91 °C (lit.)

mp

88-91 °C (lit.)

Quality Level

200

Quality Level

200

Quality Level

300

Quality Level

200

grade

ACS reagent

grade

ACS reagent

grade

-

grade

-

Application

Imidazole can be used as a proton transfer agent in the synthesis of porous organic polymers because of its amphiprotic nature and fast proton transfer behavior.
Imidazole can be used as a catalyst in the following      
  • Silylation of alcohols, carboxylic acids, and amines in the presence of silyl chloride in DMF.      
  • To prepare acid chlorides from the corresponding carboxylic acids and phosgene.      
  • Imidazole-PPh3/I2 catalytic system used in the conversion of alcohols into iodides.      
  • Imidazole-PPh3/I2 is used in the diol deoxygenation reaction.      

Excellent for buffers in the range of pH 6.2-7.8

Legal Information

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

Signal Word

Danger

Hazard Statements

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Repr. 1B - Skin Corr. 1C

Storage Class Code

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

WGK

WGK 2

Flash Point(F)

293.0 °F - closed cup

Flash Point(C)

145 °C - closed cup


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25G
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