Methyl N-hy­droxy-N-(2-methyl­phen­yl)carbamate

There are three independent mol­ecules in the asymmetric unit of the title compound, C₉H₁₁NO₃, which are connected by O—H...O hydrogen bonds, forming an R₃³(15) ring. The dihedral angles between the planes of the benzene and amide groups are 75.16 (3), 71.47 (3) and 70.56 (3)°. The hy­droxy O atom lies 0.912 (3), 1.172 (2) and 1.339 (2) Å from the mean plane of the corresponding benzene ring in the three mol­ecules.

3′′-(2-Fluoro­benzyl­idene)-4′-(2-fluoro­phen­yl)-1′-methyl­dispiro­[acenaphthyl­ene-1,2′-pyrrolidine-3′,1′′-cyclo­penta­ne]-2,2′′-dione

In the title compound, C₃₃H₂₅F₂NO₂, the acenaphthene ring system forms dihedral angles of 50.93 (14) and 36.89 (14)° with the benzene rings. The pyrrolidine and cyclo­penta­none rings adopt envelope (with the N atom as the flap) and twisted conformations, respectively. In the crystal, C—H...O and C—H...F inter­actions link the mol­ecules.

Bis(5-amino-1H-tetra­zole-κN⁴)di­aqua­(oxalato-κ²O¹,O²)cadmium

In the monomeric title complex, [Cd(C₂O₄)(CH₃N₅)₂(H₂O)₂], the Cd^II ion exhibits a distorted octa­hedral coordination geometry, with the equatorial plane defined by two O atoms from an oxalate ligand and two N atoms from two 5-amino-1H-tetra­zole ligands; the axial sites are occupied by two water mol­ecules, with longer Cd—O bond lengths. An intra­molecular N—H...O hydrogen bond occurs. In the crystal, N—H...O as well as O—H...O and O—H...N hydrogen bonds (some of which are bifurcated) link the complex mol­ecules into a three-dimensional network.

10-(3,5-Dinitro­phen­yl)-5,5-difluoro-1,3,7,9-tetra­methyl-5H-dipyrrolo­[1,2-c:2′,1′-f][1,3,2]diaza­borinin-4-ium-5-uide

In an effort to discover new potential boron-dipyrromethene (BODIPY) dyes, the title compound, C₁₉H₁₇BF₂N₄O₄, was prepared from 2,4-dimethyl­pyrrole, 3,5-dinitro­benzaldehyde and boron trifluoride in a one-pot reaction. The BODIPY fragment is nearly planar, with a maximum deviation from the least-squares plane of 0.251 (2) Å, and the benzene ring is inclined at a dihedral angle of 86.8 (6)° to the BODIPY mean plane. In the crystal, pairs of C—H...F hydrogen bonds connect neighbouring mol­ecules into inversion dimers, which are linked by further strong C—H...F inter­actions, forming a supra­molecular layered array parallel to the bc plane.

Diethyl 4-(2-meth­oxy­phen­yl)-2,6-di­methyl-1,4-di­hydro­pyridine-3,5-di­carboxyl­ate

In the title compound, C₂₀H₂₅NO₅, the di­hydro­pyridine ring adopts a flattened boat conformation. The meth­oxy­phenyl ring is almost perpendicular to the mean plane of the pyridine ring [dihedral angle = 88.42 (3)°]. The two carbonyl units adopt a synperiplanar conformation with respect to the double bonds in the di­hydro­pyridine ring. In the crystal, mol­ecules are connected by N—H...O hydrogen bonds into R₄⁴(24) tetra­meric rings. A region of disordered electron density, located at the center of four adjacent mol­ecules, was treated with the SQUEEZE routine in PLATON [Spek (2009). Acta Cryst. D65, 148–155]. It is probably the result of traces of the solvent of crystallization and was not taken into account during the structure refinement.

Ethyl 4-(4-chloro­phen­yl)-2-methyl-5-oxo-5,6,7,8-tetra­hydro­quinoline-3-carboxyl­ate

In the title compound, C₁₉H₁₈ClNO₃, the non-aromatic part of the fused ring system adopts an envelope conformation with the central methyl­ene C atom as the flap. The dihedral angle between the pyridine and benzene rings is 56.98 (3)°. In the crystal, mol­ecules are linked into double layers parallel to (100) by a network of weak C—H...O inter­actions.

(2S,3R)-3-(2-Bromo­phen­yl)-2-nitro-2,3,6,7-tetra­hydro-1-benzo­furan-4(5H)-one

The title compound, C₁₄H₁₂BrNO₄, has two chiral C atoms. The C atom next to the O atom in the di­hydro­furan ring has an S configuration, while the adjacent chiral C atom has an R configuration. The cyclo­hex-2-enone and di­hydro­furan rings both adopt envelope conformations, with the flap atoms (middle CH₂ in cyclo­hex-2-enone and NO₂-substituted C in di­hydro­furan) lying 0.612 (3) and 0.295 (2) Å, respectively, from the mean plane of the remaining atoms. The dihedral angle between the mean planes of the furan and benzene rings is 80.0 (3)°. In the crystal, the mol­ecules are linked by C—H...O inter­actions, generating a three-dimensional network.

(2S,3S)-3-(3-Bromo­phen­yl)-6,6-dimethyl-2-nitro-2,3,6,7-tetra­hydro­benzo­furan-4(5H)-one

The title compound, C₁₆H₁₆BrNO₄, has two adjacent chiral C atoms and both have an S configuration. The fused cyclo­hex-2-enone and di­hydro­furan rings both adopt envelope conformations, with the quaternary C atom and the nitro-substituted C atoms as the respective flap. The flap atoms lie 0.607 (3) and −0.253 (2) Å, respectively, from the mean plane of the remaining ring atoms on opposite sides. The dihedral angle between the mean plane of the four coplanar atoms of the di­hydro­furan ring and the phenyl ring is 86.16 (3)°. In the crystal, mol­ecules are linked by weak C—H...O inter­actions, forming a ladder motif parallel to the b axis.

1,5-Bis(4-iso­propyl­benzyl­idene)thio­carbonohydrazide

The title compound, C₂₁H₂₆N₄S, was synthesized by the condensation reaction of 4-iso­propyl­benzaldehyde with thio­carbohydrazide in ethanol. The planes of the two benzene rings in the mol­ecule are inclined at 22.6 (1)°. In the crystal, pairs of inter­molecular N—H...S hydrogen bonds link the mol­ecules into inversion dimers.