反应详情

4,4,4-Trifluoro-3-oxo-butyric acid ethyl ester (16 g, 86.4 mmol) was dissolved in acetic anhydride (33.6 g, 329.6 mmol) and triethyl orthoformate (38.4 g, 260 mmol) was added to the mixture. The resultant mixture was refluxed for 18 hours. The mixture was concentrated under reduced pressure to obtain 20 g of 2-[1-Ethoxy-meth-(E)-ylidene]-4,4,4-trifluoro-3-oxo-butyric acid ethyl ester as crude.

1. concentrationThe mixture was concentrated under reduced pressure