Pechmann condensation
| Pechmann condensation | |||||||||
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| Named after | Hans von Pechmann | ||||||||
| Reaction type | Ring forming reaction | ||||||||
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| Temperature | Variable | ||||||||
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| Organic Chemistry Portal | pechmann-condensation | ||||||||
The Pechmann condensation is a synthesis of coumarins, starting from a phenol and a carboxylic acid or ester containing a β-carbonyl group. The condensation is performed under acidic conditions. The mechanism involves an esterification/transesterification followed by attack of the activated carbonyl ortho to the oxygen to generate the new ring. The final step is a dehydration, as seen following an aldol condensation. It was discovered by the German chemist Hans von Pechmann .