title: Crystal structure of 5-[4-(di-ethyl-amino)-benzyl-idene]-2,2-dimethyl-1,3-dioxane-4,6-dione.
abstract: The title compound, C17H21NO4, consists of substituted Meldrum's acid with a [4-(di-ethyl-amino)-phen-yl]methyl-idene 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 mol-ecule. This leads to the formation of C-H⋯O-type intra-molecular 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 inter-actions, which associate the mol-ecules into inversion dimers.
authors.affiliation: Faculty of Materials Science and Applied Chemistry, Riga Technical University, Str. P. Valdena 3/7, Riga, LV 1048, Latvia.
authors.forename: Egija
authors.initials: E
authors.lastname: Stepina
authors.affiliation: Faculty of Materials Science and Applied Chemistry, Riga Technical University, Str. P. Valdena 3/7, Riga, LV 1048, Latvia ; Latvian Institute of Organic Synthesis, Str. Aizkraukles 21, Riga, LV 1006, Latvia.
authors.forename: Dmitrijs
authors.initials: D
authors.lastname: Stepanovs
authors.affiliation: Faculty of Materials Science and Applied Chemistry, Riga Technical University, Str. P. Valdena 3/7, Riga, LV 1048, Latvia.
authors.forename: Inese
authors.initials: I
authors.lastname: Mierina
authors.affiliation: Faculty of Materials Science and Applied Chemistry, Riga Technical University, Str. P. Valdena 3/7, Riga, LV 1048, Latvia.
authors.forename: Mara
authors.initials: M
authors.lastname: Jure
keywords: 5-aryl­methyl­ene-2,2-dimethyl-1,3-dioxan-4,6-dione; aryl­idene Meldrum’s acid; crystal structure; intra­molecular hydrogen bonding; organic synthesis