Perkin reaction

Perkin reaction
Named after	William Henry Perkin
Reaction type	Condensation reaction
Reaction
Aromatic aldehyde + Acid anhydride + Alkali salt of the acid ↓ Cinnamic acid derivatives
Identifiers
RSC ontology ID	RXNO:0000003
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The Perkin reaction is an organic reaction developed by William Henry Perkin that is used to make cinnamic acids. It gives an α,β-unsaturated aromatic acid by the aldol condensation of an aromatic aldehyde and an acid anhydride, in the presence of an alkali salt of the acid.^[1][2] The alkali salt acts as a base catalyst, and other bases can be used instead.^[3]

Several reviews have been written.^[4][5][6]

Reaction mechanism

The above mechanism is not universally accepted, as several other versions exist, including decarboxylation without acetic group transfer.^[7]

See also

• Erlenmeyer-Plöchl azlactone and amino acid synthesis
• Stobbe condensation
• Pechmann condensation

References

1. Perkin, W. H. (1868). "VI.—On the artificial production of coumarin and formation of its homologues". J. Chem. Soc. 21: 53, 181–186. doi:10.1039/js8682100053.
2. Perkin, W. H. (1877). "XXVIII.—On some hydrocarbons obtained from the homologues of cinnamic acid; and on anethol and its homologues". J. Chem. Soc. 31: 660–674. doi:10.1039/js8773200660.
3. Dippy, J. F. J.; Evans, R. M. (1950). "The nature of the catalyst in the Perkin condensation". J. Org. Chem. 15 (3): 451–456. doi:10.1021/jo01149a001.
4. Johnson, J. R. (1942). "The Perkin Reaction and Related Reactions". Org. React. 1: 210. doi:10.1002/0471264180.or001.08. ISBN 0471264180.
5. House, H. O. (1972) Modern Synthetic Reactions, W. A. Benjamin, Menlo Park, California, 2nd ed, pp. 660–663
6. Rosen, T. (1991). "The Perkin Reaction". Comp. Org. Syn. 2: 395–408. doi:10.1016/B978-0-08-052349-1.00034-2. ISBN 978-0-08-052349-1.
7. Bansal, Raj K.　(1998) Organic Reaction Mechanisms, Tata McGraw Hill, 3rd Edition , pp. 199–201, ISBN 9780470858585 doi:10.1002/0470858583.