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1.  (E)-2-[4-(Trifluoro­meth­oxy)benzyl­idene]indan-1-one 
In the title compound, C17H11F3O2, the dihydro­indene ring is approximately planar with a maximum deviation of 0.024 (2) Å and makes a dihedral angle of 3.17 (8) Å with the adjacent benzene ring. In the crystal, mol­ecules are inter­connected by C—H⋯O inter­actions, forming an infinite chain along the c axis.
doi:10.1107/S1600536811028698
PMCID: PMC3213585  PMID: 22091162
2.  (E)-2-(4-Bromo­benzyl­idene)indan-1-one 
In the title compound, C16H11BrO, the dihydro­indene ring system is approximately planar, with a maximum deviation of 0.008 (2) Å. The mean plane of this ring system forms a dihedral angle of 3.73 (11)°, with the bromo-substituted benzene ring. In the crystal, weak inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into sheets parallel to the ab plane and further stabilization is provided by weak C—H⋯π inter­actions involving the bromo-substituted benzene rings.
doi:10.1107/S1600536811031746
PMCID: PMC3200602  PMID: 22058940
3.  (E)-2-(4-Chloro­benzyl­idene)indan-1-one 
In the title compound, C16H11ClO, the dihedral angle between the almost planar dihydro­indene ring system (r.m.s. deviation = 0.009 Å) and the chloro­benzene ring is 3.51 (14)°. In the crystal, mol­ecules are connected by C—H⋯O and weak C—H⋯Cl inter­actions, forming infinite layers parallel to (101).
doi:10.1107/S1600536811027589
PMCID: PMC3213510  PMID: 22091089
4.  (2E)-2-Benzyl­idene-5,6-dimethoxy­indan-1-one 
The mol­ecular structure of the title compound, C18H16O3, is roughly planar; the maximum deviation of the indanone ring system is 0.027 (1) Å and it makes a dihedral angle of 2.69 (3)° with the phenyl ring. The torsion angles between the two meth­oxy groups and the ­indanone ring are −14.67 (11) and −1.11 (12)°. In the crystal, mol­ecules are connected into a ribbon along the a axis via weak inter­molecular C—H⋯O hydrogen bonds. Weak inter­molecular C—H⋯π and π–π [centroid–centroid distance = 3.7086 (6) Å] inter­actions are also observed.
doi:10.1107/S1600536810035695
PMCID: PMC2983266  PMID: 21587524
5.  (E)-3-[4-(Dimethyl­amino)­benzyl­idene]-2,3-di­hydro-1H,9H-pyrrolo­[2,1-b]quinazolin-9-one 
The title compound, C20H19N3O, was obtained by condensation of 2,3-dihydro-1H,9H-pyrrolo­[2,1-b]quinazolin-9-one (alkaloid de­oxy­vasicinone, isolated from Peganum Harmala) with 4-(dimethyl­amino)­benzaldehyde in the presence of sodium methoxide. The 2,3-dihydro-1H,9H-pyrrolo­[2,1-b]quinazolin-9-one part of the mol­ecule is roughly planar (r.m.s. deviation = 0.0178 Å) and is essentially coplanar with the benzil­idene ring (r.m.s. deviation = 0.0080 Å), forming a dihedral angle of 5.0 (1)°. The crystal structure is stabilized by two aromatic π–π stacking inter­actions observed between the benzene rings of neighboring mol­ecules [centroid–centroid distance = 3.7555 (19) Å.
doi:10.1107/S1600536810020878
PMCID: PMC3006833  PMID: 21587830
6.  (E)-2-[4-(Piperidin-1-yl)benzyl­idene]-2,3-dihydro-1H-inden-1-one 
In the title compound, C21H21NO, the indene ring system is essentially planar with a maximum deviation of 0.066 (1) Å and makes dihedral angles of 7.93 (6) and 2.43 (6)°, respectively, with the benzene plane and the mean plane of the piperidine ring. These latter two planes make a dihedral angle of 7.61 (7)°. In the crystal, mol­ecules are linked by C—H⋯O inter­actions, forming infinite chains along the b axis.
doi:10.1107/S1600536810041723
PMCID: PMC3009073  PMID: 21589059
7.  N′-[4-(Dimethyl­amino)benzyl­idene]-3-hydr­oxy-2-naphthohydrazide 
The title compound, C20H19N3O2, was obtained by the condensation of 4-(dimethyl­amino)benzaldehyde with 3-hydr­oxy-2-naphthohydrazide. The mol­ecule is approximately planar, with an intra­molecular N—H⋯O hydrogen bond involving the imino H atom and the hydr­oxy O atom. The dihedral angle between the benzene ring and the naphthyl mean plane is 2.72 (13)°. In the crystal structure, symmetry-related mol­ecules are linked by inter­molecular O—H⋯O hydrogen bonds, forming chains propagating in the c-axis direction.
doi:10.1107/S160053680900960X
PMCID: PMC2969016  PMID: 21582600
8.  N,N′-Bis[2-chloro-5-(trifluoro­meth­yl)benzyl­idene]ethane-1,2-diamine 
The mol­ecule of the title Schiff base compound, C18H12Cl2F6N2, adopts an E configuration with respect to the azomethine C=N bond. Intra­molecular C—H⋯F (× 2) and C—H⋯Cl (× 2) hydrogen bonds generate S(5) ring motifs. The imino group is coplanar with the aromatic ring. Within the mol­ecule, the planar units are parallel, but extend in opposite directions from the methyl­ene bridge, as indicated by the dihedral angle between the two benzene rings of 3.74 (6)°. The inter­esting features of the crystal structure are weak inter­molecular Cl⋯N and F⋯F inter­actions, with distances of 2.9192 (11) and 3.2714 (10) Å, respectively, which are shorter than the sum of the van der Waals radii of the relevent atoms. These inter­actions link neighbouring mol­ecules into dimers which are stacked down the b axis.
doi:10.1107/S1600536808024926
PMCID: PMC2960650  PMID: 21201706
9.  N 2,N 2′-Bis[4-(dimethyl­amino)­benzyl­idene]pyridine-2,6-dicarbohydrazide monohydrate 
In the title compound, C25H27N7O2·H2O, the bis­[4-(dimethyl­amino)­benzyl­idene]pyridine-2,6-dicarbohydrazide mol­ecule and the water mol­ecule are located on a twofold rotation axis. The benzene and pyridine rings form a dihedral angle of 17.13 (7)°. In the crystal, inter­molecular N—H⋯O and O—H⋯O hydrogen bonds link the mol­ecules into a two-dimensional supermolecular structure parallel to the ab plane.
doi:10.1107/S1600536810038778
PMCID: PMC3009364  PMID: 21588930
10.  1′-Methyl-4′-[4-(trifluoro­meth­yl)phen­yl]dispiro­[acenaphthyl­ene-1,2′-pyrrolidine-3′,2′′-indane]-2,1′′(1H)-dione 
In the title compound, C31H22F3NO2, the pyrrolidine and cyclo­pentane rings within the dihydro­indene ring system are in envelope conformations, with the N atom and the spiro-C atom at the flap, respectively. An intra­molecular C—H⋯O hydrogen bond forms an S(8) ring motif. The mean plane through the pyrrolidine ring [r.m.s. deviation = 0.179 (2) Å] makes dihedral angles of 86.30 (13), 88.99 (10) and 79.69 (11)° with the benzene ring, the dihydro­acenaphthyl­ene ring and the mean plane of the indane system, respectively. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯N hydrogen bonds into a two-dimensional network parallel to the ac plane. C—H⋯π inter­actions further stabilize the crystal structure.
doi:10.1107/S1600536812013645
PMCID: PMC3344443  PMID: 22590205
11.  4-Bromo-2-(4-fluoro­benzyl­idene)indan-1-one 
In the mol­ecule of the title compound, C16H10BrFO, the indane ring system is planar with a maximum deviation of 0.020 (3) Å. An intra­molecular C—H⋯O inter­action results in the formation of a planar ring, which is oriented at dihedral angles of 2.24 (3) and 2.34 (3)° with respect to the adjacent rings. π–π contacts between the benzene and indane rings [centroid–centroid distances = 3.699 (1) and 3.786 (1)Å] may stabilize the crystal structure.
doi:10.1107/S1600536809025781
PMCID: PMC2977330  PMID: 21583618
12.  Bromido({2-[2-(diphenyl­phosphan­yl)benzyl­idene]hydrazin-1-yl­idene}(4-meth­oxy­anilino)methane­thiol­ato)palladium(II) acetone monosolvate 
In the title compound, [PdBr(C27H23N3OPS)]·C3H6O, the coordination geometry about the PdII atom is distorted square-planar, arising from the attached Br, S, P and N atoms (N and Br are trans), the maximum deviation from the plane being 0.2053 (4) Å for the N atom. The three benzene rings attached to the P atom make dihedral angles of 69.78 (7), 87.05 (7) and 77.50 (7)° with each other. An intra­molecular C—H⋯N hydrogen bond forms an S(6) ring motif. In the crystal, the complex mol­ecules form infinite chains along the a-axis direction through C—H⋯Br inter­actions, and a C—H⋯O inter­action links the main mol­ecule with the acetone solvent mol­ecule.
doi:10.1107/S1600536812028760
PMCID: PMC3393237  PMID: 22807805
13.  7′-Phenyl-1′,3′,5′,6′,7′,7a’-hexa­hydro­dipiro[acenaphthyl­ene-1,5′-pyrrolo­[1,2-c]thia­zole-6′,2′′-indane]-2,1′′(1H)-dione 
In the title compound, C31H23NO2S, the pyrrolidine ring adopts an envelope conformation (with the spiro C atom as the flap), while the thia­zolidine ring and the two cyclo­pentane rings adopt twisted conformations. The mean plane through the hexa­hydro­pyrrolo­[1,2-c]thia­zole ring [r.m.s deviation = 0.400 (1) Å] forms dihedral angles of 76.83 (4), 80.70 (5) and 79.00 (4)° with the benzene ring and the mean planes of the dihydro­acenaphthyl­ene and the dihydro­indene rings, respectively. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds into sheets lying parallel to the bc plane. One of the ketone O atoms accepts three such bonds. Weak C—H⋯π inter­actions are also observed.
doi:10.1107/S1600536812013293
PMCID: PMC3344191  PMID: 22606194
14.  N′-[4-(Dimethyl­amino)­benzyl­idene]furan-2-carbohydrazide 
The title compound, C14H15N3O2, was prepared by the reaction of 4-(dimethyl­amino)­benzaldehyde and furan-2-carbohydrazide. The dihedral angle between the benzene ring and the furan ring is 25.59 (19)°. In the crystal, mol­ecules are linked by inter­molecular N—H⋯O hydrogen bonds, forming chains along [010].
doi:10.1107/S1600536810037244
PMCID: PMC2983222  PMID: 21587664
15.  11-[(E)-Benzyl­idene]-14-hy­droxy-8-phenyl-6-thia-3,13-diaza­hepta­cyclo­[13.7.1.19,13.02,9.02,14.03,7.019,23]tetra­cosa-1(22),15(23),16,18,20-pentaen-10-one 
In the title compound, C34H28N2O2S, the piperidine ring adopts a chair conformation. One of the pyrrolidine rings adopts an envelope conformation with the methyl­ene C atom at the flap whereas the other pyrrolidine ring and the thia­zolidine ring adopt half-chair conformations. The mean plane of the dihydro­acenaphthyl­ene ring system [maximum deviation = 0.067 (1) Å] makes dihedral angles of 28.31 (5) and 31.32 (6)° with the two terminal benzene rings. An intra­molecular O—H⋯N hydrogen bond forms an S(5) ring motif. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯S hydrogen bonds into layers lying parallel to the ac plane.
doi:10.1107/S1600536812024270
PMCID: PMC3393284  PMID: 22807841
16.  2-[4-(Diethyl­amino)­benzyl­idene]malono­nitrile 
In the title compound, C14H15N3, the diethyl­amino N atom, benzene ring, olefinic bond and cyano groups form an extended conjugated system, making the mol­ecule nearly planar: the dihedral angle between the benzene ring and the best plane throught the cyano groups is 4.93 (10)°, while the dihedral angle between the benzene ring and the plane through the diethyl­amino N atom and the two attached ethyl C atoms is 9.51 (14)°. In the crystal, inter­molecular C—H⋯π inter­actions stabilize the packing.
doi:10.1107/S1600536811019295
PMCID: PMC3120336  PMID: 21754914
17.  (E)-N′-Benzyl­idene-5-methyl­isoxazole-4-carbohydrazide 
The mol­ecule of the title compound, C12H11N3O2, is approximately planar with an r.m.s. deviation of 0.0814 Å from the plane through all the non-H atoms. The dihedral angle formed by the benzene and isoxazole rings is 6.88 (16)°. The mol­ecular conformation is stabilized by an intra­molecular C—H⋯N hydrogen bond, forming an S(6) ring, and the mol­ecule displays an E configuration with respect to the C=N double bond. In the crystal structure, inter­molecular N—H⋯O hydrogen bonds form centrosymmetric dimers which are further linked by weak C—H⋯N inter­actions augmented by very weak C—H⋯π contacts, forming layers parallel to (120).
doi:10.1107/S1600536809052969
PMCID: PMC2980173  PMID: 21580013
18.  7′-[4-(Trifluoro­meth­yl)phen­yl]-5′,6′,7′,7a’-tetra­hydrodispiro­[indan-2,5′-pyrrolo­[1,2-c][1,3]thia­zole-6′,2′′-indan]-1,3,1′′-trione 
In the title compound, C29H20F3NO3S, the thia­zolidine ringadopts a half-chair conformation. The pyrrolidine and two five-membered carbocyclic rings are in envelope conformations with the spiro C atoms at the flaps. The trifluoro­methyl-substituted benzene ring forms dihedral angles of 62.37 (14) and 87.40 (14)° with the benzene rings of the dihydro-1H-indene units. The two benzene rings form a dihedral angle of 36.94 (15)°. The mol­ecular structure is stabilized by intra­molecular C—H⋯O hydrogen bonds, which generate S(6) ring motifs. In the crystal, mol­ecules are linked into inversion dimers by pairs of inter­molecular C—H⋯O hydrogen bonds, generating R 2 2(10) ring motifs.
doi:10.1107/S1600536811047118
PMCID: PMC3238947  PMID: 22199796
19.  (2E)-2-Benzyl­idene-N-phenyl­hydrazinecarboxamide 
The mol­ecule of the title compound, C14H13N3O, adopts an E conformation with respect to the azomethine C=N bond, and is roughly planar, with an r.m.s. deviation of the non-H atoms from the least-squares plane of 0.100 (2) Å and a dihedral angle between the terminal benzene rings of 5.74 (12)°. An intramolecular N—H⋯N hydrogen bond closes an S(6) ring. In the crystal, mol­ecules are linked by the pairs of N—H⋯O hydrogen bonds into centrosymmetric dimers. Dimers related by translation along [010] form slanted stacks, the shortest C⋯C inter­molecular distance within the stack being 3.283 (3) Å. Weak C—H⋯π inter­actions link the stacks into a three-dimensional structure.
doi:10.1107/S1600536814008344
PMCID: PMC4011198  PMID: 24860389
20.  (E)-2-[4-(Trifluoro­meth­yl)benzyl­idene]-2,3-dihydro-1H-inden-1-one 
In the title mol­ecule, C17H11F3O, the indan ring system and the trifluoro­methyl-substituted benzene ring are approximately individually planar and form a dihedral angle of 1.81 (5)° with each other. In the crystal, mol­ecules are linked by pairs of weak bifurcated (C—H)2⋯O hydrogen bonds to form centrosymmetric dimers, generating R 2 1(6) and R 2 2(10) ring motifs. These dimers are connected by further weak C—H⋯O hydrogen bonds into one-dimensional chains along the b axis. Weak C—H⋯π inter­actions are also present.
doi:10.1107/S1600536812003157
PMCID: PMC3275283  PMID: 22347139
21.  2-[(E)-2,5-Dimethoxy­benzyl­idene]indan-1-one 
In the title compound, C18H16O3, the mean plane of the nine-membered indane system makes a dihedral angle of 3.71 (17)° with the benzene ring of the dimethoxy­phenyl group. The mol­ecular conformation is stabilized by intra­molecular C—H⋯O hydrogen contacts. The crystal structure is stabilized by inter­molecular C—H⋯O inter­actions, which link neighbouring mol­ecules into one-dimensional extended chains along the [100] direction. In the structure, C—H⋯π inter­actions are also observed.
doi:10.1107/S1600536809013579
PMCID: PMC2977741  PMID: 21583877
22.  N′-[(E)-Benzyl­idene]-1-ethyl-7-methyl-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carbohydrazide 
In the title compound, C19H18N4O2, the 1,8-naphthyridine ring system is essentially planar [r.m.s. deviation = 0.011 (3) Å]. The dihedral angle between the naphthyridine ring system and the phenyl ring is 28.95 (7)°. The carbohydrazide H atom is involved in an intra­molecular N—H⋯O hydrogen bond, forming a six-membered hydrogen-bonded ring. In the crystal, the mol­ecules arrange themselves into centrosymmetric dimers by means of inter­molecular C—H⋯O hydrogen bonds.
doi:10.1107/S1600536809048739
PMCID: PMC2972033  PMID: 21578871
23.  5-[(E)-Benzyl­idene]-2-hy­droxy-8,9-di­phenyl-3,10-diaza­hexa­cyclo­[10.7.1.13,7.02,11.07,11.016,20]henicosa-1(19),12(20),13,15,17-pentaen-6-one 
In the title compound, C38H30N2O2, the acenaphthyl­ene ring is close to being planar [maximum deviation = 0.1047 (11) Å]. The dihedral angles between the three benzene rings and the acenaphthyl­ene system are 39.47 (3), 37.65 (3) and 44.47 (3)°. An intra­molecular O—H⋯N inter­action forms an S(5) hydrogen-bond ring motif. In the crystal, mol­ecules are linked into [101] chains by a set of C—H⋯O inter­actions.
doi:10.1107/S1600536811040645
PMCID: PMC3247611  PMID: 22219916
24.  N′-[(Z)-4-(Dimethyl­amino)benzyl­idene]-4-nitro­benzohydrazide mono­hydrate 
In the asymmetric unit of the title compound, C16H16N4O3·H2O, there are two symmetry-independent hydrazide mol­ecules with almost identical geometries, and two independent water mol­ecules. The dihedral angles between the two benzene rings in the two hydrazide mol­ecules are 0.11 (5) and 0.77 (5)°. In one mol­ecule, an intra­molecular C—H⋯O hydrogen bond generates a ring of graph-set motif S(5). Inter­molecular N—H⋯O, O—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds and π–π stacking inter­actions between the benzene rings [centroid–centroid distances in the range 3.5021 (6)–3.6403 (6) Å] are observed, together with O⋯O [2.7226 (11) Å], O⋯N [2.7072 (10) Å] and N⋯O [2.7072 (10)–2.8582 (12) Å] short contacts. The hydrazine mol­ecules are stacked along the b axis and adjacent mol­ecules are linked by water mol­ecules.
doi:10.1107/S1600536808028328
PMCID: PMC2959418  PMID: 21201117
25.  4′-(4-Chlorophenyl)-1′-methyldispiro[indan-2,2′-pyrrolidine-3′,2′′-indan]-1,3,1′′-trione 
In the title compound, C27H20ClNO3, the two cyclo­pentane rings adopt envelope conformations. The pyrrolidine ring also adopts an envelope conformation (with the spiro C atom as the flap) and its least-squares plane (fitted to five atoms) makes dihedral angles of 66.50 (9), 77.36 (8) and 73.76 (8)° with the chloro­benzene ring and the two 2,3-dihydro-1H-indene ring systems, respectively. The mol­ecular conformation is stabilized by an intra­molecular C—H⋯O hydrogen bond, which generates an S(6) ring motif. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds into chains running parallel to the [001] direction.
doi:10.1107/S1600536811033642
PMCID: PMC3200810  PMID: 22064509

Results 1-25 (360352)