(E)-1-Ferrocenyl-3-[2-(2-hy­droxy­eth­oxy)phen­yl]prop-2-en-1-one

In the title compound, [Fe(C₅H₅)(C₁₆H₁₅O₃)], the cyclo­penta­dienyl rings are in an eclipsed conformation and the benzene ring makes dihedral angles of 10.84 (9) and 12.35 (9)°, respectively, with the substituted and unsubstituted cyclo­penta­dienyl rings. In the crystal, mol­ecules form inversion dimers through pairs of O—H...O hydrogen bonds. Weak C—H...O hydrogen bonds are observed between the dimers.

1-(4-{2-[(E)-3-(4-Chloro­phen­yl)-3-oxo­prop-1-en-1-yl]phen­oxy}but­yl)-1H-indole-3-carbaldehyde

In the title compound, C₂₈H₂₄ClNO₃, the dihedral angles between the central benzene ring and the indole ring system and the chlorobenzene ring are 70.81 (5) and 78.62 (5)°, respectively. The mol­ecular structure is stabilized by a weak intra­molecular C—H...O inter­action. In the crystal, pairs of C—H...O hydrogen bonds link the mol­ecules into inversion dimers with an R₂²(14) motif.

Diethyl 1,8-diphenyl-11-oxatricyclo­[6.2.1.0^2,7]undeca-2,4,6-triene-9,10-dicarboxyl­ate

The title compound, C₂₈H₂₆O₅, is the Diels–Alder adduct from 1,3-diphenyl­benzo[c]furan and diethyl maleate. The mol­ecule comprises of a fused tricyclic system containing two five-membered rings, which are in envelope conformations with the O atom at the flap, and a six-membered ring adopting a boat conformation. The dihedral angle between phenyl substituents in the 1,8-positions is 55.1 (1)°. The ethyl groups are disordered over two sets of sites, with occupancy ratios of 0.648 (9):0.352 (9) and 0.816 (1):0.184 (1). In the crystal, pairs of C—H...π inter­actions link the mol­ecules into inversion dimers.

2-Ferrocenyl-3-nitro-2H-chromene

In the title compound, [Fe(C₅H₅)(C₁₄H₁₀NO₃)], the cyclo­penta­dienyl rings are in an eclipsed conformation and the pyran ring adopts a half-chair conformation. The mean plane of the pyran ring makes dihedral angles of 79.33 (1) and 80.73 (1)°, respectively, with the substituted and unsubstituted cyclo­penta­dienyl rings. In the crystal, pairs of C—H...O hydrogen bonds link the mol­ecules into inversion dimers with R₂²(16) motifs.

Dimethyl 1-(4-methyl­phen­yl)-8-(thio­phen-2-yl)-11-oxatricyclo­[6.2.1.0^2,7]undeca-2,4,6,9-tetra­ene-9,10-dicarboxy­late

The title compound, C₂₅H₂₀O₅S, is the product of a Diels–Alder reaction. The mol­ecule consists of a fused tricyclic system containing two five-membered rings and one six-membered ring. The five-membered rings both show an envelope conformation with the O atom at the flap, whereas the six-membered ring adopts a boat conformation. The thio­phene ring is disordered over two sets of sites with an occupancy ratio of 0.53 (1):0.47 (1). The dihedral angles between the 4-methyl­phenyl ring and the major and minor components of the thio­phene ring are 66.3 (1) and 67.9 (1)°, respectively, while the dihedral angle between the disordered thio­phenyl components is 3.1 (1)°. The mean plane of the tricyclic ring system makes dihedral angles of 35.8 (1), 30.8 (1) and 32.8 (1)°, respectively, with the 4-methyl­phenyl ring and the major and minor components of the thio­phenyl ring. In the crystal, inversion dimers are formed through pairs of C—H...π inter­actions. In addition, C—H...O inter­actions are observed.

Diethyl 1,8-bis­(4-methyl­phen­yl)-11-oxatricyclo­[6.2.1.0^2,7]undeca-2,4,6-triene-9,10-dicarboxyl­ate

The title compound, C₃₀H₃₀O₅, is the Diels–Alder adduct from 1,3-diphenyl­benzo[c]furan and diethyl maleate. The mol­ecule comprises a fused tricyclic system containing two five-membered rings, which are in envelope conformations with the O atom at the flap, and a six-membered ring adopting a boat conformation. The dihedral angle between the 4-methyl­phenyl substituents in the 1- and 8-positions is 62.1 (1)°. The ethyl group of one ester group and the eth­oxy group of the other ester group are disordered over two sets of sites, with occupancy ratios of 0.43 (2):0.57 (2) and 0.804 (7):0.196 (7), respectively. In the crystal, inversion dimers are formed through pairs of C—H...O inter­actions.

5-(3-Meth­oxy­phen­yl)-3-phenyl-1,2-oxazole

In the title compound, C₁₆H₁₃NO₂, the isoxazole ring makes dihedral angles of 17.1 (1)° with the 3-meth­oxy­phenyl ring and 15.2 (1)° with the phenyl group. Centrosymmetric dimers that are realised by pairs of C—H...π inter­actions are observed in the crystal structure.

rac-Methyl 3-(2-meth­oxy­phen­yl)-3a,4-di­hydro-3H-chromeno[4,3-c]isoxazole-3a-carboxyl­ate

The title compound, C₁₉H₁₇NO₅, comprising two stereogenic C atoms of the same configuration, crystallizes in a centrosymmetric space group as a racemate. The pyran ring adopts a half-chair conformation, while the isoxazole ring adopts an envelope conformation with the C atom bonded to the meth­oxy­phenyl group as the flap. The dihedral angle between the mean plane of the pyran ring and the adjacent benzene ring is 5.86 (5)°. In the crystal, mol­ecules are linked by a weak C—H...O hydrogen bond, forming a chain along the a axis.

rac-3-(4-Chloro­phen­yl)-3a,4-di­hydro-3H-chromeno[4,3-c]isoxazole-3a-carbo­nitrile

The title compound, C₁₇H₁₁ClN₂O₂, which contains two stereogenic C atoms, crystallizes in a centrosymmetric space group as a racemate. The pyran ring and the isoxazole ring adopt sofa and twisted conformations, respectively. The dihedral angle between the benzene ring and the mean plane through the near coplanar atoms of the pyran ring is 4.17 (5)°. The mol­ecular conformation features a weak C—H...O contact. In the crystal, C—H...O hydrogen bonds link the mol­ecules, forming chains along the a-axis direction.

2-[(2-Chloro­quinolin-3-yl)(hy­droxy)meth­yl]acrylo­nitrile

In the title compound, C₁₃H₉ClN₂O, the dihedral angle between the acrylo­nitrile C=C—CN plane and the quilonine ring system is 71.3 (2)°. In the crystal, mol­ecules are linked by O—H...N hydrogen bonds, forming chains along [01-1]. The chains are linked into a three-dimensional network through C—H...N inter­actions.

Dimethyl 1,8-bis­(4-methyl­phen­yl)-11-oxatri­cyclo­[6.2.1.0^2,7]undeca-2,4,6,9-tetra­ene-9,10-di­carboxyl­ate

The title compound, C₂₈H₂₄O₅, consists of a fused tricyclic system containing two five-membered rings and one six-membered ring. The five-membered rings both exhibit an envelope conformation with the O atom at the flap, whereas the six-membered ring adopts a boat conformation. The dihedral angle between the 4-methyl­phenyl rings at the 1,8-positions is 76.4 (1)°. In the crystal, mol­ecules are stacked in columns along the a axis through C—H...O inter­actions.

Methyl 2-[(2-chloro­quinolin-3-yl)(hy­droxy)meth­yl]acrylate

There are two independent mol­ecules (A and B) in the asymmetric unit of the title compound, C₁₄H₁₂ClNO₃. The mean planes of the methyl ester unit (C_meth­yl—O—C=O; r.m.s. deviation = 0.051 Å for mol­ecule A and 0.016 Å for mol­ecule B) and the chloro­quilonine ring system (r.m.s. deviation = 0.023 Å for mol­ecule A and 0.014 Å for mol­ecule B) form dihedral angles of 63.5 (1)° in mol­ecule A and 78.1 (1)° in mol­ecule B. The main difference between the two independent mol­ecules is reflected in the (H)O—C—C=C(H₂) torsion angle which is −109.7 (2)° in mol­ecule A and 10.6 (2)° in mol­ecule B. An intra­molecular O—H...O hydrogen bond is observed in mol­ecule A. In the crystal, mol­ecules A and B are linked into pairs via bifurcated O—H...(N,Cl) hydrogen bonds and a weak C—H...O hydrogen bond links pairs of mol­ecules into chains along [100].

Methyl 3′-benzyl-4′-(2-chloro­phen­yl)-1′-methyl-2-oxo­spiro­[indoline-3,2′-pyrrolidine]-3′-carboxyl­ate

In the title compound, C₂₇H₂₅ClN₂O₃, the methyl­pyrrolidine ring adopts an envelope conformation with the N atom at the flap. The mean plane of the pyrrolidine ring makes dihedral angles of 82.1 (1), 84.4 (1) and 79.8 (1)°, respectively, with the adjacent benzene ring, the mean plane of the indoline ring system and the phenyl ring. The mol­ecular structure is stabilized by intra­molecular C—H...O hydrogen bonds. In the crystal, mol­ecules are linked into chains along [101] by N—H...O hydrogen bonds. C—H...π inter­actions are observed between the chains.