|Molar mass||95.10 g·mol−1|
|Appearance||Colourless crystalline solid|
|Melting point||107.8 °C (226.0 °F; 380.9 K)|
|Boiling point||280 °C (536 °F; 553 K) decomp.|
|Solubility in other solvents||Soluble in water,
|UV-vis (λmax)||293 nm (ε 5900, H2O soln)|
|Dipole moment||4.26 D|
|R-phrases||R36 R37 R38|
|Flash point||210 °C (410 °F; 483 K)|
Related functional groups
|alcohol, lactam, lactim,
|pyridine, thymine, cytosine,
|Supplementary data page|
|Refractive index (n),
Dielectric constant (εr), etc.
|UV, IR, NMR, MS|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
2-Pyridone is an organic compound with the formula C
4NH(O). This colourless crystalline solid is used in peptide synthesis. It is well known to form hydrogen bonded structures somewhat related to the base-pairing mechanism found in RNA and DNA. It is also a classic case of a molecule that exists as tautomers.
- 1 Structure
- 2 Tautomerism
- 3 Dimerisation
- 4 Synthesis
- 5 Chemical properties
- 6 Environmental behavior
- 7 See also
- 8 References
- 9 General references
The most prominent feature of 2-pyridone is the amide group; a nitrogen with a hydrogen bound to it and a keto group next to it. In peptides, amino acids are linked by this pattern, a feature responsible for some remarkable physical and chemical properties. In this and similar molecules, the hydrogen bound to the nitrogen is suitable to form strong hydrogen bonds to other nitrogen- and oxygen-containing species.
The hydrogen attached to the nitrogen can also move to the oxygen. Through movement of this hydrogen and electrons, the second tautomer form, 2-hydroxypyridine is formed. This lactam lactim tautomerism can also be found in other molecules with a similar structure.
Tautomerism in the solid state
The predominant solid state form is 2-pyridone. This has been confirmed by X-ray crystallography which shows that the hydrogen in solid state is closer to the nitrogen than to the oxygen (because of the low electron density at the hydrogen the exact positioning is difficult), and IR-spectroscopy, which shows that the C=O longitudinal frequency is present whilst the O-H frequencies are absent.
Tautomerism in solution
The determination of which of the two tautomeric forms is present in solution has been the subject of many publications. The energy difference appears to be very small and is dependent on the polarity of the solvent. Non-polar solvents favour the formation of 2-hydroxypyridine whereas polar solvents such as alcohols and water favour the formation of 2-pyridone.
The energy difference for the two tautomers in the gas phase was measured by IR-spectroscopy to be 2.43 to 3.3 kJ/mol for the solid state and 8.95 kJ/mol and 8.83 kJ/mol for the liquid state.
Tautomerisation mechanism A
The single molecular tautomerisation has a forbidden 1-3 suprafacial transition state and therefore has a high energy barrier for this tautomerisation, which was calculated with theoretical methods to be 125 or 210 kJ/mol. The direct tautomerisation is energetically not favoured. There are other possible mechanisms for this tautomerisation.
2-Pyridone and 2-hydroxypyridine can form dimers with two hydrogen bonds.
Aggregation in the solid state
In the solid state the dimeric form is not present; the 2-pyridones form a helical structure over hydrogen bonds. Some substituted 2-pyridones form the dimer in solid state, for example the 5-methyl-3-carbonitrile-2-pyridone. The determination of all these structures was done by X-ray crystallography. In the solid state the hydrogen is located closer to the oxygen so it could be considered to be right to call the colourless crystals in the flask 2-pyridone.
Aggregation in solution
In solution the dimeric form is present; the ratio of dimerisation is strongly dependent on the polarity of the solvent. Polar and protic solvents interact with the hydrogen bonds and more monomer is formed. Hydrophobic effects in non-polar solvents lead to a predominance of the dimer. The ratio of the tautomeric forms is also dependent on the solvent. All possible tautomers and dimers can be present and form an equilibrium, and the exact measurement of all the equilibrium constants in the system is extremely difficult.
Some publications only focus one of the two possible patterns, and neglect the influence of the other. For example, to calculation of the energy difference of the two tautomers in a non-polar solution will lead to a wrong result if a large quantity of the substance is on the side of the dimer in an equilibrium.
Tautomerisation mechanism B
The direct tautomerisation is not energetically favoured, but a dimerisation followed by a double proton transfer and dissociation of the dimer is a self catalytic path from one tautomer to the other. Protic solvents also mediate the proton transfer during the tautomerisation.
2-Pyrone can be obtained by a cyclisation reaction, and converted to 2-pyridone via an exchange reaction with ammonia:
2-Pyridone catalyses a variety of proton-dependent reactions, for example the aminolysis of esters. In some cases, molten 2-pyridone is used as a solvent. The mutarotation of sugars and that 2-pyridone has a large effect on the reaction from activated esters with amines in nonpolar solvent, which is attributed to its tautomerisation and utility as a ditopic receptor. Current interest focuses on proton transfer from 2-pyridone and its tautomer, using isotope labeling, kinetics and quantum chemical methods to determine the rate determining step in the reaction mechanism.
2-Pyridone is rapidly degraded by microorganisms in the soil environment, with a half life less than one week. Organisms capable of growth on 2-pyridone as a sole source of carbon, nitrogen, and energy have been isolated by a number of researchers. The most extensively studied 2-pyridone degrader is the gram positive bacterium Arthrobacter crystallopoietes, a member of the phylum Actinobacteria which includes numerous related organisms that have been shown to degrade pyridine or one or more alkyl-, carboxyl-, or hydroxyl-substituted pyridines. 2-Pyridone degradation is commonly initiated by mono-oxygenase attack, resulting in a diol, such as 2,5-dihydroxypyridine, which is metabolized via the maleamate pathway. Fission of the ring proceeds via action of 2,5-dihydroxypyridine monooxygenase, which is also involved in metabolism of nicotinic acid via the maleamate pathway. In the case of Arthrobacter crystallopoietes, at least part of the degradative pathway is plasmid-borne. Pyridine diols undergo chemical transformation in solution to form intensely colored pigments. Similar pigments have been observed in quinoline degradation, also owing to transformation of metabolites, however the yellow pigments often reported in degradation of many pyridine solvents, such as unsubstituted pyridine or picoline, generally result from overproduction of riboflavin in the presence of these solvents. Generally speaking, degradation of pyridones, dihydroxypyridines, and pyridinecarboxylic acids is commonly mediated by oxygenases, whereas degradation of pyridine solvents often is not, and may in some cases involve an initial reductive step.
- Forlani L., Cristoni G., Boga C., Todesco P. E., Del Vecchio E., Selva S., Monari M. (2002). "Reinvestigation of tautomerism of some substituted 2-hydroxypyridines". Arkivoc XI: 198–215.
- Yang H. W., Craven B. M. (1998). "Charge Density of 2-Pyridone". Acta Crystallogr. B 54 (6): 912–920. doi:10.1107/S0108768198006545. PMID 9880899.
- Penfold B. R. (1953). "The Electron Distribution in Crystalline Alpha Pyridone". Acta Crystallogr. 6 (7): 591–600. doi:10.1107/S0365110X5300168X.
- Ohms U., Guth H.,Heller E., Dannöhl H., Schweig A. (1984). "Comparison of Observed and Calculated Electron-Density 2-Pyridone, C5H5NO, Crystal-Structure Refinements at 295K and 120K, Experimental and Theoretical Deformation Density Studies". Z. Kristallogr. 169: 185–200. doi:10.1524/zkri.19184.108.40.206.
- Almlöf J., Kvick A., Olovsson I. (1971). "Hydrogen Bond Studies Crystal Structure of Intermolecular Complex 2-Pyridone-6-Chloro-2-Hdroxypyridine". Acta Crystallogr. B 27 (6): 1201–1208. doi:10.1107/S0567740871003753.
- Vögeli U., von Philipsborn W. (1973). "C-13 and H-1 NMR Spectroscopie Studies on Structure of N-Methyle-3-Pyridone and 3-Hydroypyridine". Org Magn Reson 5 (12): 551–559. doi:10.1002/mrc.1270051202.
- Specker H., Gawrosch H. (1942). "Ultraviolet absorption of benztriaxole, pryridone and its salts". Chem. Ber. (75): 1338–1348.
- Leis D. G., Curran B. C. (1945). "Electric Moments of Some Gamma-Substituted Pyridines". Journal of the American Chemical Society 67 (67): 79–81. doi:10.1021/ja01217a028.
- Albert A., Phillips J. N. (1956). "Ionisation Constants of Heterocyclic Substances Hydroxy-Derivates of Nitrogenous Six-Membered Ring-Compounds". J. Chem. Soc.: 1294–1304. doi:10.1039/jr9560001294.
- Cox R. H., Bothner-By A. A (1969). "Proton Magnetic Resonance Spectra of Tautomeric Substituted Pyridines and Their Conjugated Acides". J. Phys. Chem. 73 (73): 2465–2468. doi:10.1021/j100842a001.
- Aksnes DW, Kryvi; Kryvi, Håkon; Samuelson, Olof; Sjöstrand, Elisabeth; Svensson, Sigfrid (1972). "Substituent and Solvent Effects in Proton Magnetic -Resonance (PMR) Spectra of 6 2-Substituted Pyridines". Acta. Chem. Scand. 26 (26): 2255–2266. doi:10.3891/acta.chem.scand.26-2255.
- Aue DH, Betowski LD, Davidson WR, Bower MT, Beak P (1979). "Gas-Phase Basicities of Amides and Imidates - Estimation of Protomeric Equilibrium-Constantes by the Basicity methode in the Gas-Phase". Journal of the American Chemical Society 101 (101): 1361–1368. doi:10.1021/ja00500a001.
- Frank J., Alan R. Katritzky (1976). "Tautomeric pyridines. XV. Pyridone-hydroxypyridine equilibria in solvents of different polarity". J Chem Soc Perkin Trans 2 (12): 1428–1431. doi:10.1039/p29760001428.
- Brown R. S., Tse A., Vederas J. C. (1980). "Photoelectro-Determined Core Binding Energies and Predicted Gas-Phase Basicities for the 2-Hydroxypyridine 2-Pyridone System". Journal of the American Chemical Society 102 (102): 1174–1176. doi:10.1021/ja00523a050.
- Beak P. (1977). "Energies and Alkylation of Tautomeric Heterocyclic-Compounds - Old Problems New Answers". Acc. Chem. Res. 10 (10): 186–192. doi:10.1021/ar50113a006.
- Abdulla H. I., El-Bermani M. F. (2001). "Infrared studies of tautomerism in 2-hydroxypyridine 2-thiopyridine and 2-aminopyridine". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 57 (57): 2659–2671. doi:10.1016/S1386-1425(01)00455-3.
- Hammes GG, Lillford PJ (1970). "A Kinetic and Equilibrium Study of Hydrogen Bond Dimerization of 2-Pyridone in Hydrogen Bonding Solvent". J. Am. Chem. Soc. 92 (92): 7578–7585. doi:10.1021/ja00729a012.
- Gilchrist, T.L. (1997). Heterocyclic Chemistry ISBN 0-470-20481-8
- Rybakov V. R., Bush A. A., Babaev E. B., Aslanov L. A. (2004). "3-Cyano-4,6-dimethyl-2-pyridone (Guareschi Pyridone)". Acta Crystallogr E 6 (2): o160–o161. doi:10.1107/S1600536803029295.
- I. Guareschi (1896). Mem. Reale Accad. Sci. Torino II. 46, 7, 11, 25. Missing or empty
- Baron, H.; Remfry, F. G. P.; Thorpe, Y. F. (1904). J. Chem. Soc. 85 1726. Missing or empty
- Fischer C. B., Steininger H., Stephenson D. S., Zipse H. (2005). "Catalysis of Aminolysis of 4-Nitrophenyl Acetate by 2-Pyridone". Journal for Physical Organic Chemistry 18 (9): 901–907. doi:10.1002/poc.914.
- L.-H. Wang, H. Zipse (1996). "Bifunctional Catalysis of Ester Aminolysis - A Computational and Experimental Study" (SUBSCRIPTION REQUIRED). Lieb. Ann. (10): 1501–1509.
- Rawson J. M., Winpenny R. E. P. (1995). "The coordination chemistry of 2-pyridones and its derivatives". Coordination Chemistry Reviews 139 (139): 313–374. doi:10.1016/0010-8545(94)01117-T.
- Shima, S.; Lyon, E. J.; Sordel-Klippert, M.; Kauss, M.; Kahnt, J.; Thauer, R. K.; Steinbach, K.; Xie, X.; Verdier, L. and Griesinger, C., "Structure elucidation: The cofactor of the iron-sulfur cluster free hydrogenase Hmd: structure of the light-inactivation product", Angew. Chem., Int. Ed., 2004, 43, 2547-2551.
- Sims, Gerald K.; S (1985). "Degradation of Pyridine Derivatives in Soil". Journal of Environmental Quality 14 (4): 580–584. doi:10.2134/jeq1985.00472425001400040022x.
- Fischer C. B., Polborn K., Steininger H., Zipse H. (2004). "Synthesis and Solid-State Structures of Alkyl-Substituted 3-Cyano-2-pyridones" (SUBSCRIPTION REQUIRED). Zeitschrift für Naturforschung (59b): 1121–1131.
- Ensign, Jerald C.; Rittenberg, Sydney C. (1963). "A crystalline pigment produced from 2-hydroxypyridine by arthrobacter crystallopoietes n.sp". Archiv für Mikrobiologie 47 (2): 137–153. doi:10.1007/BF00422519.
- Sims, G. K.; O'Loughlin, E.J.; Crawford, Ronald (1989). "Degradation of pyridines in the environment" (PDF). CRC Critical Reviews in Environmental Control 19 (4): 309–340. doi:10.1080/10643388909388372.
- Oloughlin, E; Kehrmeyer, S; Sims, G (1996). "Isolation, characterization, and substrate utilization of a quinoline-degrading bacterium". International Biodeterioration & Biodegradation 38 (2): 107–118. doi:10.1016/S0964-8305(96)00032-7.
- Sims, Gerald K.; O (1992). "Riboflavin Production during Growth of Micrococcus luteus on Pyridine". Applied and Environmental Microbiology 58 (10): 3423–3425. PMC 183117. PMID 16348793.
- Engdahl K., Ahlberg P. (1977). Journal Chemical Research: 340–341. Missing or empty
- Bensaude O, Chevrier M, Dubois J (1978). "Lactim-Lactam Tautomeric Equilibrium of 2-Hydroxypyridines. 1.Cation Binding, Dimerization and Interconversion Mechanism in Aprotic Solvents. A Spectroscopic and Temperature-Jump Kinetic Study". J. Am. Chem. Soc. 100 (22): 7055–7066. doi:10.1021/ja00490a046.
- Bensaude O, Dreyfus G, Dodin G, Dubois J (1977). "Intramolecular Nondissociative Proton Transfer in Aqueous Solutions of Tautomeric Heterocycles: a Temperature-Jump Kinetic Study". J. Am. Chem. Soc. 99 (13): 4438–4446. doi:10.1021/ja00455a037.
- Bensaude O, Chevrier M, Dubois J (1978). "Influence of Hydration upon Tautomeric Equilibrium". Tetrahedron Lett. 19 (25): 2221–2224. doi:10.1016/S0040-4039(01)86850-7.
- Hammes GG, Park AC (1969). "Kinetic and Thermodynamic Studies of Hydrogen Bonding". J. Am. Chem. Soc. 91 (4): 956–961. doi:10.1021/ja01032a028.
- Hammes GG, Spivey HO (1966). "A Kinetic Study of the Hydrogen-Bond Dimerization of 2-Pyridone". J. Am. Chem. Soc. 88 (8): 1621–1625. doi:10.1021/ja00960a006. PMID 5942979.
- Beak P, Covington JB, Smith SG (1976). "Structural Studies of Tautomeric Systems: the Importance of Association for 2-Hydroxypyridine-2-Pyridone and 2-Mercaptopyridine-2-Thiopyridone". J. Am. Chem. Soc. 98 (25): 8284–8286. doi:10.1021/ja00441a079.
- Beak P, Covington JB, White JM (1980). "Quantitave Model of Solvent Effects on Hydroxypyridine-Pyridone and Mercaptopyridine-Thiopyridone Equilibria: Correlation with Reaction-Field and Hydrogen-Bond Effects". J. Org. Chem. 45 (8): 1347–1353. doi:10.1021/jo01296a001.
- Beak P, Covington JB, Smith SG, White JM, Zeigler JM (1980). "Displacement of Protomeric Equilibria by Self-Association: Hydroxypyridine-Pyridone and Mercaptopyridine-Thiopyridone Isomer Pairs". J. Org. Chem. 45 (8): 1354–1362. doi:10.1021/jo01296a002.