Chemicals  Piperidine
Piperidine
CAS number 110-89-4
                             


General

Synonyms: hexahydropyridine, pentamethyleneimine, azacyclohexane, cyclopentimine, cypentil, hexazane,
Molecular formula: C5H11N
CAS No: 110-89-4
EINECS No: 203-813-0
Annex I Index No: 613-027-00-3

Physical data

Appearance: colourless liquid with the odour of pepper
Melting point: -11 C
Boiling point: 106 C
Vapour density: 3 (air = 1)
Vapour pressure: 40 mm Hg at 20 C
Density (g cm-3): 0.86
Flash point: 16 C (closed cup)
Explosion limits:
Autoignition temperature:
Water solubility: soluble

Stability

Stable. Highly flammable. Incompatible with strong oxidizing agents, strong acids, organic acids, water. Vapours may flow along surfaces to a distant source of ignition.

Toxicology

Poison. May be fatal if inhaled or swallowed. Severe irritant. Skin contact may cause severe irritation or burns. Contact with the eyes may lead to permanent damage.

Toxicity data

ORL-RAT LD50 400 mg kg-1
IPR-MUS LD50 50 mg kg-1
SKN-RBT LD50 320 mg kg-1
ORL-MUS LD50 30 mg kg-1
ORL-RBT LD50 145 mg kg-1

Risk phrases

R11 R23 R24 R34. (Note: The risk phrases here are those given by Annex I. Annex I does not specify R22 or R25, but this material is clearly harmful if swallowed so should be treated as though R22 were included.]

Personal protection

Safety glasses, gloves, good ventilation. Remove sources of ignition from the working area.

Piperidine is an organic compound with the molecular formula (CH2)5NH. This heterocyclic amine consists of a six-membered ring containing five methylene units and one nitrogen atom. It is a colorless fuming liquid with an odor described as ammoniacal, pepper-likethe name comes from the genus name Piper, which is the Latin word for pepper. Piperidine is a widely used building block and chemical reagent in the synthesis of organic compounds, including pharmaceuticals.

a colorless, liquid hydrocarbon, (CH)NH, found in many alkaloids and obtained by reducing pyridine or by treating piperine with alkali: used in making rubber, oils, fuels, etc.

Production

Industrially, piperidine is produced by the hydrogenation of pyridine, usually over a molybdenum sulfide catalyst

Production

Industrially, piperidine is produced by the hydrogenation of pyridine, usually over a molybdenum sulfide catalyst
Uses

Piperidine is used as a solvent and as a base. The same is true for certain derivatives: N-formylpiperidine is a polar aprotic solvent with better hydrocarbon solubility than other amide solvents, and 2,2,6,6-tetramethylpiperidine is highly sterically hindered base, useful because of its low nucleophilicity and high solubility in organic solvents.

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