It’s only fair to share… 4-Pentenoic acid, 5-(3,4-methylenedioxyphenyl)-3-oxo-, ethyl ester cas 860547-52-0 MF C14 H14 O5 4-Pentenoic acid, 5-(1,3-benzodioxol-5-yl)-3-oxo-, ethyl ester Molecular Weight, 262.26 Melting Point (Experimental) Value: 58-60 °C Purification of the residue by flash column chromatography (10% ethyl acetate in hexanes) afforded the β-keto ester (12.0 g, 90%) as a pale yellow oil. …