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In the title compound, C29H21O3P, a coumarin-substitued ylid, the P atom is linked to three benzene rings and a planar coumarin moiety via a methyl­enecarbonyl group. The bond lengths in the P=C–C=O fragment clearly indicate a delocalized system involving the olefinic and carbonyl bonds. The mol­ecular structure is stabilized by an intra­molecular C—H...O inter­action that results in an S7 graph-set ring motif. In the crystal, mol­ecules are linked into a three-dimensional framework by C—H...O hydrogen bonds.

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In the title hydrazone derivative, C15H13ClN2O2, the dihedral angle between the benzene rings is 2.36 (2)°. An intra­molecular N—H...O hydrogen bond is present. In the crystal, N—H...O and C—H...O hydrogen bonds link the mol­ecules into chains running parallel to the b axis.

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In the title hydrazone derivative, C15H14N2O5, the benzene rings are twisted by 7.55 (8)° with respect to each other. The azomethine double bond adopts an E conformation. The mol­ecular structure is stabilized by intra­molecular O—H...N and N—H...O hydrogen bonds, generating S6 ring motifs. In the crystal, mol­ecules are linked into a three-dimensional network by O—H...O hydrogen bonds.
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