Giesen Joseph A, Grayson Scott M, Mague Joel T
Department of Chemistry, Tulane University, New Orleans, LA 70118, USA.
Acta Crystallogr E Crystallogr Commun. 2020 Jan 1;76(Pt 1):86-90. doi: 10.1107/S2056989019016670.
In 2,2,5-trimethyl-1,3-dioxane-5-carb-oxy-lic acid, CHO, the carboxyl group occupies an equatorial position on the 1,3-dioxane ring. In the crystal, O-H⋯O hydrogen bonds form chains of mol-ecules, which are linked into a three-dimensional network by C-H⋯O hydrogen bonds. The asymmetric unit of 2,2,5-trimethyl-1,3-dioxane-5-carb-oxy-lic anhydride, CHO, consists of two independent mol-ecules, which are linked by C-H⋯O hydrogen bonds. In the crystal, these units are connected into corrugated layers two mol-ecules thick and parallel to the plane by additional C-H⋯O hydrogen bonds.
在2,2,5-三甲基-1,3-二氧六环-5-羧酸（CHO）中，羧基占据1,3-二氧六环环上的一个平伏位置。在晶体中，O-H⋯O氢键形成分子链，这些分子链通过C-H⋯O氢键连接成三维网络。2,2,5-三甲基-1,3-二氧六环-5-羧酸酐（CHO）的不对称单元由两个独立的分子组成，它们通过C-H⋯O氢键相连。在晶体中，这些单元通过额外的C-H⋯O氢键连接成两层分子厚且平行于 平面的波纹层。
