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P57506

Sigma-Aldrich

Pyridine

ReagentPlus®, ≥99%

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Empirical Formula (Hill Notation):
C5H5N
CAS Number:
Molecular Weight:
79.10
Beilstein:
103233
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

vapor density

2.72 (vs air)

Quality Level

vapor pressure

10 mmHg ( 13.2 °C)
20 mmHg ( 25 °C)

product line

ReagentPlus®

Assay

≥99%

form

liquid

autoignition temp.

899 °F

expl. lim.

12.4 %

impurities

≤0.1% water (Karl Fischer)

refractive index

n20/D 1.509 (lit.)

pH

8.5 (25 °C, 15.82 g/L)

bp

115 °C (lit.)

mp

−42 °C (lit.)

density

0.978 g/mL at 25 °C (lit.)

SMILES string

C1=CN=CC=C1

InChI

1S/C5H5N/c1-2-4-6-5-3-1/h1-5H

InChI key

JUJWROOIHBZHMG-UHFFFAOYSA-N

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1 of 4

This Item
676772360570494410
Pyridine ReagentPlus®, ≥99%

Sigma-Aldrich

P57506

Pyridine

-
Pyridine ACS reagent, ≥99.0%

Sigma-Aldrich

676772

Pyridine

Essential Grade
Pyridine ACS reagent, ≥99.0%

Sigma-Aldrich

360570

Pyridine

Essential Grade
Pyridine biotech. grade, ≥99.9%

Sigma-Aldrich

494410

Pyridine

-
vapor pressure

10 mmHg ( 13.2 °C), 20 mmHg ( 25 °C)

vapor pressure

10 mmHg ( 13.2 °C), 20 mmHg ( 25 °C)

vapor pressure

10 mmHg ( 13.2 °C), 20 mmHg ( 25 °C)

vapor pressure

10 mmHg ( 13.2 °C), 20 mmHg ( 25 °C)

assay

≥99%

assay

≥99.0%

assay

≥99.0%

assay

≥99.9%

form

liquid

form

liquid

form

liquid

form

liquid

autoignition temp.

899 °F

autoignition temp.

899 °F

autoignition temp.

899 °F

autoignition temp.

899 °F

expl. lim.

12.4 %

expl. lim.

12.4 %

expl. lim.

12.4 %

expl. lim.

12.4 %

General description

Pyridine (Pyr) is a nitrogen-containing six-membered heterocyclic compound that is commonly used as a solvent in organic synthesis. It also has wide applications as a base, catalyst, and intermediate for synthesis.

Application

Pyridine can be used as a solvent:    
  • To synthesize glycophospholipids and phosphate diesters or phosphonate monoesters in the presence of trichloroacetonitrile as an activating reagent.      
  • In Knoevenagel condensation reactions.      
  • In the TEMPO-mediated radical polymerization of 3-vinylpyridine.

Legal Information

ReagentPlus is a registered trademark of Sigma-Aldrich Co. LLC

Pictograms

FlameExclamation mark

Signal Word

Danger

Hazard Classifications

Acute Tox. 4 Dermal - Acute Tox. 4 Inhalation - Acute Tox. 4 Oral - Eye Irrit. 2 - Flam. Liq. 2 - Skin Irrit. 2

Storage Class Code

3 - Flammable liquids

WGK

WGK 2

Flash Point(F)

68.0 °F - closed cup

Flash Point(C)

20 °C - closed cup


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