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4-ethyl cinnamic acid synthesis

4synthesis methods
723304-09-4 Synthesis
2-Propenoicacid,3-(4-ethylphenyl)-,ethylester,(2E)-(9CI)

723304-09-4
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4-ethyl cinnamic acid

120680-98-0
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Yield:120680-98-0 99%

Reaction Conditions:

Stage #1: ethyl (E)-3-(4-ethylphenyl)-2-propenoatewith sodium hydroxide;water in ethanol; for 4 h;Reflux;
Stage #2: with hydrogenchloride;water

References:

Teichert, Antje;Pfaltz, Andreas [Angewandte Chemie - International Edition,2008,vol. 47,# 18,p. 3360 - 3362] Location in patent:experimental part