Crystal structure of 5-[4-(di­ethyl­amino)­benzyl­idene]-2,2-dimethyl-1,3-dioxane-4,6-dione

The title compound, C(17)H(21)NO(4), consists of substituted Meldrum’s acid with a [4-(di­ethyl­amino)­phen­yl]methyl­idene fragment attached to the fifth position. The heterocycle assumes a distorted boat conformation. The planar part of heterocycle is almost coplanar with the benzene ring due to the presence of a long conjugated system in the mol­ecule. This leads to the formation of C—H⋯O-type intra­molecular contacts. As a result of the absence of hydrogen-bond donors in the structure, the crystal packing is controlled by van der Waals forces and weak C—H⋯O inter­actions, which associate the mol­ecules into inversion dimers.