Pyridine

C₅H₅NCAS 110-86-179.10 g/mol

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Properties

Molecular formula: C₅H₅N
Molar mass: 79.10 g/mol
Exact mass: 79.0422 Da
Density: 0.9827 g/mL (at 20 °C)
Melting point: −41.6 °C
Boiling point: 115.2–115.3 °C
pKa: 5.23
Flash point: 20 °C (closed cup)
Water solubility: miscible
logP: 1.08Crippen estimate
Polar surface area: 12.9 Å²
H-bond donors / acceptors: 0 / 1
Rotatable bonds: 0

Hazards

Danger

H225 Highly Flammable liquid and vaporFlammable liquids
H302 Harmful if swallowedAcute toxicity, oral
H312 Harmful in contact with skinAcute toxicity, dermal
H332 Harmful if inhaledAcute toxicity, inhalation

Harmonised EU classification (CLP Annex VI, index 613-002-00-7), via PubChem.

Precautionary statements

P210, P233, P240, P241, P242, P243, P261, P264, P270, P271, P280, P301+P317, P302+P352, P303+P361+P353, P304+P340, P317, P321, P330, P362+P364, P370+P378, P403+P235, P501

Identifiers

CAS number

110-86-1

SMILES

c1ccncc1

InChIKey

JUJWROOIHBZHMG-UHFFFAOYSA-N

InChI

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

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Names and synonyms

5 names

Azabenzene
Azine
CP 32
NSC 141574
NSC 406123

Reactions

Hydroxylation of enolates with oxodiperoxymolybdenum(pyridine)(hexamethylphosphoric triamide), MoO5·Py·HMPA(MoOPH): 3-hydroxy-1,7,7-trimethylbicyclo[2.2.1]heptan-2-one (Bicyclo[2.2.1]heptan-2-one, 3-hydroxy-1,7,7-trimethyl-)product

Safety data sheets

One stored sheet lists this compound in section 3, matched by the CAS number 110-86-1. Each row opens the sheet with its composition and PDF.

Pyridine (Certified ACS) ≤ 100 %Fisher Scientific Company · 2025-12-18

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Work with Pyridine

Predict the NMR spectrum1H and 13C shifts with multiplicities Make a solutionWhat to weigh for any molarity and volume Check drug-likenessLipinski, Veber and lead-likeness Boiling point under vacuumAt any pressure, from its normal boiling point Isotope patternExact mass and the mass spectrum pattern

Stereoisomers, salts and isotopologues

The same compound in another form: other stereochemistry, a salt or hydrate, the free acid or base, or an isotope-labelled version.

Pyridine-D57291-22-7Labelled Pyridinium chlorochromate26299-14-9Salt Pyridinium p-toluenesulfonate24057-28-1Salt Sulfur trioxide pyridine complex26412-87-3Salt Pyridinium chloride628-13-7Salt Poly(pyridine fluoride)62778-11-4Salt Pyridinium hydrobromide18820-82-1Salt Pyridinium trifluoroacetate464-05-1Salt Hydrofluoric acid pyridine complex32001-55-1Salt Pyridine methanesulfonate39879-60-2Salt Pyridinium fluorochromate83042-08-4Salt Bis(pyridine)iodonium tetrafluoroborate15656-28-7Salt

Similar compounds

Cornforth reagent20039-37-650 % similar Pyrazine290-37-950 % similar Pyrimidine289-95-246 % similar Pyridazine289-80-542 % similar 4-Phenylpyridine939-23-141 % similar 3-Phenylpyridine1008-88-435 % similar 4-Styrylpyridine103-31-135 % similar 3-Methylpyridine108-99-635 % similar

Tanimoto similarity of circular fingerprints over the whole catalogue.

All similar compounds

Elsewhere

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