organic compounds
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The title compound, C14H14N2O3, is the exo isomer with a syn arrangement of two O atoms in the isoxazole and oxazine rings. The dihedral angle between the isoxazole and phenyl rings is 60.38 (4)°. In the crystal, weak C—HO hydrogen bonds link the molecules, forming a three-dimensional network. The isoxazole O atom is an acceptor for three of these hydrogen bonds.
organic compounds
Open access
The title compound, C15H17NO4, is the exo isomer with a syn arrangement of the O atom in the isoxazole ring to the methyl group of the bicyclic alkene. The dihedral angle between the isoxazole ring and the benzene ring is 7.42 (9)°. In the crystal, weak C—HO hydrogen bonds link molecules, forming a three-dimensional network. The isoxazole O atom is an acceptor for both weak hydrogen bonds.
organic compounds
Open access
The stereochemistry and regioschemistry (exo) of the title compound, C15H18O5, were determined by the X-ray analysis. The methoxy groups essentially lie in the plane of the benzene ring to which they are attached, as described by the C—O—CC torsion angles of −176.80 (12) and 4.67 (19)°. In the crystal, O—HO hydrogen bonds and weak C—HO hydrogen bonds link the molecules, forming chains of R21(8) rings along [010].
organic compounds
Open access
The stereochemistry and regiochemistry of the title compound, C18H18O2, were determined by the X-ray analysis. There are two independent molecules in the asymmetric unit in which the dihedral angles between the benzene rings are 88.31 (4) and 86.27 (4)°. The cyclohexene rings are in half-chair conformations. In the crystal, O—HO hydrogen bonds link alternating types of molecules into chains along [010] with graph-set C22(4).