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In the title compound, C17H12O4, the six-membered heterocyclic ring adopts a distorted screw-boat conformation. The mol­ecular structure exhibits an S(6) ring motif, owing to an intra­molecular O—H...O hydrogen bond. In the crystal, weak C—H...O contacts generate an infinite chain along the c axis. There are also π–π stacking inter­actions between neighbouring isochromanedione benzene rings, with a centroid–centroid distance of 3.755 (1) Å, and C—O...π inter­actions with an O...centroid distance of 3.964 (2) Å.

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In the title mol­ecule, C20H18O4, the three methyl groups of the tert-butyl substituent show rotational disorder. Each methyl group is split over three positions, with refined site-occupation factors of 0.711 (4), 0.146 (3) and 0.144 (4). The benzene ring of the benzoate group is oriented at a dihedral angle of 60.70 (7)° with respect to the planar chromene ring [maximum deviation = 0.046 (2) Å]. The crystal structure features centrosymmetric R22(8) dimers formed via C—H...O inter­actions, and these dimeric aggregates are connected by C—H...π inter­actions.

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In the title mol­ecule, C17H12O5, the chromen-2-one ring and the 4-meth­oxy­benzoate side chain are inclined to one another at a dihedral angle of 69.82 (9)°. The crystal structure features parallel sheets of centrosymmetric R22(6) dimers joined by a C(7) chain, resulting in centrosymetric tetra­mers of hydrogen-bonded mol­ecules with graph-set motif R44(40). These centrosymetric tetra­mers are connected by a pair of hydrogen bonds described by an R22(8) ring motif and a C(7) chain via C—H...O inter­actions. In the structure, there are also π–π stacking inter­actions between chromene benzene and the six-membered heterocyclic rings [centroid–centroid distance = 3.691 (2) Å] and weak C=O...π inter­actions [O...(ring centroid) distance = 3.357 (3) Å].
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