Pechmann condensation Assignment Help

Chemical Reactions - Pechmann condensation

The Pechmann condensation is a production of coumarins, starting from a phenol and a carboxylic acid or ester comprising a β-carbonyl group. The condensation is done under acidic conditions. The mechanism includes an esterification/transesterification followed by attack of the activated carbonyl ortho to the oxygen to produce the new ring. The last step is a dehydration, as seen follow an aldol condensation. It was founded by the German chemist Hans von Pechmann.

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