Abstract
The crystals of the title compound (C12H13NO4) are orthorhombic,P212121 witha=8.541(3),b=10.988(1), andc=11.912(1) A.M r =235.24, mp 427 K,Z=4,D x =1.348 Mg m−3, λ(MoKα=0.71069 A, μ=0.11 mm−1,T=293 K. The structure was solved by direct methods and refined by full-matrixs least squares to a finalR=0.028 for 1180 observed reflections. The molecules are connected by N-H⋯O (ring carbonyl) intermolecular H⋯O hydrogen bonds of 2.24(2) A. The 4-oxo-1,3-dioxane ring is in a slightly distorted sofa conformation with a ΔC s 1 asymmetry parameter of 3.6(2)° and the 5-methyl substituent in a pseudoaxial position. The benzoyl oxygen is turned toward the ring, resulting in a close O⋯H(C6) contact of 2.45(2) A.
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