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2-Butenoic acid, 4-oxo-4-phenyl- could react with morpholine, and obtain the 2-morpholin-4-yl-4-oxo-4-phenyl-butyric acid. This reaction needs the solvent of toluene, ethanol.
George A. Olah. Stable Carbonium Ions. IX.1 Methylbenzenonium Hexafluoroantimonates2. J. Am. Chem. Soc. 1965, 87, (5), 1103-1108.
Leonard Steinbach.; Ernest I. Becker. A Synthesis for β-Aroylacrylic Acids Substituted with Electron-withdrawing Groups. J. Am. Chem. Soc. 1954, 76, (22), 5808-5810.
Gefahrenhinweise (EU): H301-H315-H319-H335
Toxic if swallowed. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Wear protective gloves/clothing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF exposed or if you feel unwell: