Synthesis and crystal structure of allyl 7-(di­ethyl­amino)-2-oxo-2H-chromene-3-carboxyl­ate

The title compound, C(17)H(19)NO(4), was synthesized by the reaction of 7-(di­ethyl­amino)-2-oxo-2H-chromene-3-carb­oxy­lic acid with allyl bromide and purified by flash column chromatography on silica gel. Crystals suitable for single-crystal X-ray diffraction were obtained by recrystallization from acetone. The aromatic core of the mol­ecule is not planar with the di­ethyl­amino group and with the carboxyl group that are rotated out of the 2-oxo-2H-chromene plane by 6.7 (2)° and 11.4 (2)°. The NC(2) unit of the di­ethyl­amino group is planar with an angle sum close to 360°. Inter­molecular C(ar)—H⋯O(carbon­yl) inter­actions lead to the formation of chains parallel to the b axis. X-ray powder diffraction analysis proves that the title compound was obtained as a pure phase.