Studies of systemic acylanilide fungicides. Part IV. Crystal structure and molecular conformation ofN-(2-methoxyacetyl)-N-(2,6-xylyl)-α-amino-γ-butyrolactone

The crystal structure of the title compound (C₁₅H₁₉NO₄, MW 277.3 amu) was determined by three-dimensional X-ray analysis from diffractometer data. Crystal data are: monoclinic,P2₁/n,a=9.600(3) Å,b=11.964(6) Å,c=12.802(4) Å,=101.25(3)°,V=1442.1(16) ų,Z=4;D _x =1.277 Mg m^–3;(MoK)=0.10 mm^–1. FinalR=0.055 for 1686 observed reflections having 2 (MoK)<50° andI>2.5 (I). The compound is isostructural withN-(2-methoxyacetyl)-N-(2,6-xylyl)-3-amino-1,3-oxazolidin-2-one. The dimethylphenyl ring is almost perpendicular to the amidic plane of the molecule (dihedral angle 81.9°); the butyrolactone ring is in the typical envelope conformation.