Piperidine

Piperidine[1] |  |

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Names
IUPAC name

Piperidine

Preferred IUPAC name

Piperidine[2]

Other names

Hexahydropyridine
Azacyclohexane
Pentamethyleneamine
Azinane

Identifiers

CAS Number

* 110-89-4 Y

3D model (JSmol)

* Interactive image

ChEBI |

* CHEBI:18049 Y

ChEMBL |

* ChEMBL15487 Y

ChemSpider |

* 7791 Y

EC Number |

* 203-813-0

IUPHAR/BPS

* 5477

KEGG |

* C01746

PubChem CID

* 8082

RTECS number |

* TM3500000

UNII |

* 67I85E138Y Y

UN number | 2401

InChI

* InChI=1S/C5H11N/c1-2-4-6-5-3-1/h6H,1-5H2 Y

Key: NQRYJNQNLNOLGT-UHFFFAOYSA-N Y

* InChI=1/C5H11N/c1-2-4-6-5-3-1/h6H,1-5H2

* InChI=1/C5H11N/c1-2-4-6-5-3-1/h6H,1-5H2

Key: NQRYJNQNLNOLGT-UHFFFAOYAY

SMILES

* C1CCNCC1

Properties

Chemical formula

| C5H11N
Molar mass | 85.150 g·mol−1
Appearance  | Colorless liquid
Odor | Semen-like,[3] fishy-ammoniacal, pungent
Density | 0.862 g/mL
Melting point |  −7 °C (19 °F; 266 K)
Boiling point |  106 °C (223 °F; 379 K)

Solubility in water

| Miscible
Acidity (pKa)  | 11.22 (protonated)[4]

Magnetic susceptibility (χ)

| -64.2·10−6 cm3/mol
Viscosity | 1.573 cP at 25 °C
Hazards
Safety data sheet | MSDS1
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

| H225, H311, H314, H331

GHS precautionary statements

| P210, P233, P240, P241, P242, P243, P260, P261, P264, P271, P280, P301+330+331, P302+352, P303+361+353, P304+340, P305+351+338, P310, P311, P312, P321, P322, P361, P363, P370+378, P403+233
NFPA 704 (fire diamond)  |

Legal status |
Related compounds

Related compounds

| Pyridine
Pyrrolidine
Piperazine
Phosphorinane
Arsinane

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Y verify (what is YN ?)
Infobox references

Tracking categories (test):

* SizeSet
* PairSizeSet

Piperidine is an organic compound with the molecular formula (CH2)5NH. This heterocyclic amine consists of a six-membered ring containing five methylene bridges (–CH2–) and one amine bridge (–NH–). It is a colorless liquid with an odor described as objectionable, typical of amines.[5] The name comes from the genus name Piper, which is the Latin word for pepper.[6] Although piperidine is a common organic compound, it is best known as a representative structure element within many pharmaceuticals and alkaloids, such as natural-occurring solenopsins.[7]

## Contents

* 1 Production
* 2 Natural occurrence of piperidine and derivatives
* 3 Conformation
* 4 Reactions
* 5 NMR chemical control
* 6 Uses
* 7 List of piperidine medications
* 8 References
* 9 External links

## Production

Piperidine was first reported in 1850 by the Scottish chemist Thomas Anderson and again, independently, in 1852 by the French chemist Auguste Cahours, who named it.[8][9][10] Both of them obtained piperidine by reacting piperine with nitric acid.

Industrially, piperidine is produced by the hydrogenation of pyridine, usually over a molybdenum disulfide catalyst:[11]

C5H5N + 3 H2 → C5H10NH

Pyridine can also be reduced to piperidine via a modified Birch reduction using sodium in ethanol.[12]

## Natural occurrence of piperidine and derivatives

Piperidine itself has been obtained from black pepper,[13][14] from Psilocaulon absimile (Aizoaceae),[15] and in Petrosimonia monandra.[16]

The piperidine structural motif is present in numerous natural alkaloids. These include piperine, which gives black pepper its spicy taste. This gave the compound its name. Other examples are the fire ant toxin solenopsin,[17] the nicotine analog anabasine of tree tobacco (Nicotiana glauca), lobeline of Indian tobacco, and the toxic alkaloid coniine from poison hemlock, which was used to put Socrates to death.[18]

## Conformation

Piperidine prefers a chair conformation, similar to cyclohexane. Unlike cyclohexane, piperidine has two distinguishable chair conformations: one with the N–H bond in an axial position, and the other in an equatorial position. After much controversy during the 1950s–1970s, the equatorial conformation was found to be more stable by 0.72 kcal/mol in the gas phase.[19] In nonpolar solvents, a range between 0.2 and 0.6 kcal/mol has been estimated, but in polar solvents the axial conformer may be more stable.[20] The two conformers interconvert rapidly through nitrogen inversion; the free energy activation barrier for this process, estimated at 6.1 kcal/mol, is substantially lower than the 10.4 kcal/mol for ring inversion.[21] In the case of N-methylpiperidine, the equatorial conformation is preferred by 3.16 kcal/mol,[19] which is much larger than the preference in methylcyclohexane, 1.74 kcal/mol.

|

axial conformation | equatorial conformation

## Reactions

Piperidine is widely used to convert ketones to enamines.[22] Enamines derived from piperidine are substrates in the Stork enamine alkylation reaction.[23]

Upon treatment with calcium hypochlorite, piperidine converts to N-chloropiperidine, a chloramine with the formula C5H10NCl. The resulting chloramine undergoes dehydrohalogenation to afford the cyclic imine.[24]

## NMR chemical control

* 13C NMR: (CDCl3, ppm) 47, 27.2, 25.2[citation needed]
* 1H NMR: (CDCl3, ppm) 2.79, 2.19, 1.51[citation needed]

## 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 a highly sterically hindered base, useful because of its low nucleophilicity and high solubility in organic solvents.

A significant industrial application of piperidine is for the production of dipiperidinyl dithiuram tetrasulfide, which is used as an accelerator of the sulfur vulcanization of rubber.[11]

## List of piperidine medications

Minoxidil is a piperidine derivative widely used to prevent hair loss.

Piperidine and its derivatives are ubiquitous building blocks in pharmaceuticals[25] and fine chemicals. The piperidine structure is found in, for example:

* Icaridin (Insect repellent)
* SSRIs (selective serotonin reuptake inhibitors)
* Paroxetine
* Stimulants and nootropics:
* Methylphenidate
* Ethylphenidate
* Pipradrol
* Desoxypipradrol
* Histamine 3 (H3) receptor antagonists/inverse agonists:
* Pitolisant
* SERM (selective estrogen receptor modulators)
* Raloxifene
* Vasodilators
* Minoxidil
* Antipsychotic medications:
* Droperidol
* Haloperidol
* Melperone
* Mesoridazine
* Risperidone
* Thioridazine
* Opioids:
* Dipipanone
* Fentanyl and analogs
* Loperamide
* Pethidine (meperidine)
* Prodine
* Arylcyclohexylamines:
* PCP and analogs
* anticholinergic chemical weapons
* Ditran
* N-Methyl-3-piperidyl benzilate (JB-336, BZ)

Piperidine is also commonly used in chemical degradation reactions, such as the sequencing of DNA in the cleavage of particular modified nucleotides. Piperidine is also commonly used as a base for the deprotection of Fmoc-amino acids used in solid-phase peptide synthesis.

Piperidine is listed as a Table II precursor under the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances due to its use (peaking in the 1970s) in the clandestine manufacture of phencyclidine.[26]

## References

1. ↑ "International Chemical Safety Card 0317". http://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/_icsc03/icsc0317.htm.
2. ↑ "Front Matter". Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 142. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
3. ↑ Amoore, J. E. (1975). "Specific anosmia to 1-pyrroline: The spermous primary odor". J. Chem. Ecol. 1 (3): 299–310. doi:10.1007/BF00988831.
4. ↑ Hall, H. K. (1957). "Correlation of the Base Strengths of Amines". J. Am. Chem. Soc. 79 (20): 5441–5444. doi:10.1021/ja01577a030.
5. ↑ Frank Johnson Welcher (1947). Organic Analytical Reagents. D. Van Nostrand. p. 149. https://archive.org/details/in.ernet.dli.2015.7833.
6. ↑ Senning, Alexander (2006). Elsevier's Dictionary of Chemoetymology. Amsterdam: Elsevier. ISBN 978-0-444-52239-9.
7. ↑ Pianaro, Adriana; Fox, Eduardo G.P.; Bueno, Odair C.; Marsaioli, Anita J. (May 2012). "Rapid configuration analysis of the solenopsins" (in en). Tetrahedron: Asymmetry 23 (9): 635–642. doi:10.1016/j.tetasy.2012.05.005.
8. ↑ Warnhoff, Edgar W. (1998). "When piperidine was a structural problem". Bulletin for the History of Chemistry 22: 29–34. http://www.scs.illinois.edu/~mainzv/HIST/bulletin_open_access/num22/num22 p29-34.pdf.
9. ↑ Anderson, Thomas (1850). "Vorläufiger Bericht über die Wirkung der Salpetersäure auf organische Alkalien". Annalen der Chemie und Pharmacie 75: 80–83. doi:10.1002/jlac.18500750110. http://babel.hathitrust.org/cgi/pt?id=chi.47401536;view=1up;seq=92.
10. ↑ Cahours, Auguste (1852). "Recherches sur un nouvel alcali dérivé de la pipérine". Comptes Rendus 34: 481–484. http://gallica.bnf.fr/ark:/12148/bpt6k2991b/f485.item.r=.zoom. "L'alcali nouveau dérivé de la pipérine, que je désignerai sous le nom de 'pipéridine',… (The new alkali derived from piperine, which I will designate by the name of 'piperidine',…".
11. ↑ 11.0 11.1 Eller, Karsten; Henkes, Erhard; Rossbacher, Roland; Höke, Hartmut. "Ullmann's Encyclopedia of Industrial Chemistry". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a02_001.
12. ↑ Marvel, C. S.; Lazier, W. A. (1929). "Benzoyl Piperidine". Org. Synth. 9: 16. doi:10.15227/orgsyn.009.0016.
13. ↑ Späth; Englaender (1935). "Über das Vorkommen von Piperidin im schwarzen Pfeffer". Chemische Berichte 68 (12): 2218–2221. doi:10.1002/cber.19350681211.
14. ↑ Pictet, Amé; Pictet, René (1927). "Sur l'alcaloïde volatil du poivre". Helvetica Chimica Acta 10: 593–595. doi:10.1002/hlca.19270100175.
15. ↑ Rimington, Claude (1934). "Psilocaulon absimile N.E.Br. as a stock poison". South African Journal of Science 31: 184–193.
16. ↑ Juraschewski; Stepanov (1939). J. Gen. Chem. USSR 9: 1687.
17. ↑ Arbiser, J. L. et al. (2007). "Solenopsin, the alkaloidal component of the fire ant (Solenopsis invicta), is a naturally occurring inhibitor of phosphatidylinositol-3-kinase signaling and angiogenesis". Blood 109 (2): 560–5. doi:10.1182/blood-2006-06-029934. PMID 16990598.
18. ↑ Thomas Anderson Henry (1949). The Plant Alkaloids (4th ed.). The Blakiston Company.
19. ↑ 19.0 19.1 Carballeira, Luis; Pérez Juste, Ignacio (1998). "Influence of calculation level and effect of methylation on axial/equatorial equilibria in piperidines". Journal of Computational Chemistry 19 (8): 961–976. doi:10.1002/(SICI)1096-987X(199806)19:8<961::AID-JCC14>3.0.CO;2-A.
20. ↑ Blackburne, Ian D.; Katritzky, Alan R.; Yoshito Takeuchi (1975). "Conformation of piperidine and of derivatives with additional ring hetero atoms". Acc. Chem. Res. 8 (9): 300–306. doi:10.1021/ar50093a003.
21. ↑ Anet, F. A. L.; Yavari, Issa (1977). "Nitrogen inversion in piperidine". J. Am. Chem. Soc. 99 (8): 2794–2796. doi:10.1021/ja00450a064.
22. ↑ Kane, Vinayak V.; Jones, Maitland Jr. (1990). "Spiro[5.7trideca-1,4-dien-3-one"]. Organic Syntheses. http://www.orgsyn.org/demo.aspx?prep=CV7P0473. ;  Collective Volume, 7, pp. 473
23. ↑ Smith, Michael B.; March, Jerry (2001). March's Advanced Organic Chemistry: Reactions, Mechanisms, and Structure (5th ed.). Wiley-Interscience. ISBN 978-0-471-58589-3.
24. ↑ Claxton, George P.; Allen, Lloyd; Grisar, J. Martin (1977). "2,3,4,5-Tetrahydropyridine Trimer". Organic Syntheses 56: 118. doi:10.15227/orgsyn.056.0118.
25. ↑ Vitaku, E.; D. T. Smith; J. T. Njardarson (2014). "Analysis of the Structural Diversity, Substitution Patterns, and Frequency of Nitrogen Heterocycles among U.S. FDA Approved Pharmaceuticals". Journal of Medicinal Chemistry 57 (24): 10257–10274. doi:10.1021/jm501100b. PMID 25255204.
26. ↑ "List of Precursors and Chemicals Frequently Used in the Illicit Manufacture of Narcotic Drugs and Psychotropic Substances Under International Control". International Narcotics Control Board. http://www.incb.org/pdf/e/list/red.pdf.

## External links

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*[CID]: Compound ID
*[H225]: Highly flammable liquid and vapour
*[H311]: Toxic in contact with skin
*[H314]: Causes severe skin burns and eye damage
*[H331]: Toxic if inhaled
*[P210]: Keep away from heat/sparks/open flames/hot surfaces – No smoking
*[P233]: Keep container tightly closed
*[P240]: Ground/bond container and receiving equipment
*[P241]: Use explosion-proof electrical/ventilating/light/…/equipment
*[P242]: Use only non-sparking tools
*[P243]: Take precautionary measures against static discharge
*[P260]: Do not breathe dust/fume/gas/mist/vapours/spray
*[P261]: Avoid breathing dust/fume/gas/mist/vapours/spray
*[P264]: Wash … thoroughly after handling
*[P271]: Use only outdoors or in a well-ventilated area
*[P280]: Wear protective gloves/protective clothing/eye protection/face protection
*[P301+330+331]: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
*[P302+352]: IF ON SKIN: Wash with soap and water
*[P303+361+353]: IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower
*[P304+340]: IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
*[P305+351+338]: IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do – continue rinsing
*[P310]: Immediately call a POISON CENTER or doctor/physician
*[P311]: Call a POISON CENTER or doctor/physician
*[P312]: Call a POISON CENTER or doctor/physician if you feel unwell
*[P321]: Specific treatment (see … on this label)
*[P322]: Specific measures (see … on this label)
*[P361]: Remove/Take off immediately all contaminated clothing
*[P363]: Wash contaminated clothing before reuse
*[P370+378]: In case of fire: Use … for extinction
*[P403+233]: Store in a well ventilated place. Keep container tightly closed