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1.  (2E)-3-(6-Meth­oxy­naphthalen-2-yl)-1-[4-(methyl­sulfan­yl)phen­yl]prop-2-en-1-one 
The asymmetric unit of the title compound, C21H18O2S, consists of two crystallographically independent mol­ecules (A and B). The mol­ecules exist in a trans conformation with respect to the central C=C bond. The naphthalene ring system makes dihedral angles of 51.62 (12) (mol­ecule A) and 52.69 (12)° (mol­ecule B) with the benzene ring. In mol­ecule A, the prop-2-en-1-one group forms dihedral angles of 22.84 (15) and 29.02 (12)° with the adjacent naphthalene ring system and benzene ring, respectively, whereas the corresponding angles are 30.04 (12) and 23.33 (12)° in mol­ecule B. In the crystal, mol­ecules are linked by inter­molecular C—H⋯O hydrogen bonds into head-to-tail chains along the a axis. The crystal packing also features C—H⋯π inter­actions. The crystal studied was a pseudo-merohedral twin with twin law (100 0-10 00-1) and a refined component ratio of 0.6103 (16):0.3897 (16).
doi:10.1107/S1600536812028930
PMCID: PMC3394057  PMID: 22798922
2.  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
3.  4′-(4-Bromo­phen­yl)-1′-methyl­dispiro­[indan-2,2′-pyrrolidine-3′,2′′-indan]-1,3,1′′-trione 
In the title compound, C27H20BrNO3, the pyrrolidine ring adopts a half-chair conformation, while the other five-membered rings adopt flattened envelope conformations with the spiro C atoms as the flap atoms. An intra­molecular C—H⋯O hydrogen bond occurs, generating an S(6) ring. In the crystal, mol­ecules are connected via weak C—H⋯O hydrogen bonds, forming chains along the c axis.
doi:10.1107/S1600536811044515
PMCID: PMC3247508  PMID: 22220126
4.  4′-[5-(4-Fluoro­phen­yl)pyridin-3-yl]-1′-methyl­dispiro­[indan-2,2′-pyrrolidine-3′,2′′-indan]-1,3,1′′-trione 
In the title compound, C32H23FN2O3, the pyrrolidine ring adopts an envelope conformation. The monoketo- and diketo-substituted five-membered rings are in envelope and half-chair conformations, respectively. The mol­ecular structure is stabilized by an intra­molecular C—H⋯O hydrogen bond, which generates an S(6) ring motif. In the crystal, mol­ecules are linked via inter­molecular C—H⋯N and C—H⋯O hydrogen bonds into a three-dimensional network. The crystal structure is further consolidated by C—H⋯π inter­actions.
doi:10.1107/S1600536811032946
PMCID: PMC3200886  PMID: 22058982
5.  (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
6.  (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
7.  2-[(E)-4-(Dimethyl­amino)­benzyl­idene]indan-1-one 
In the title compound, C18H17NO, the dihydro­indene ring system is approximately planar, with a maximum deviation of 0.041 (2) Å. This ring system is almost coplanar with the benzene ring, making a dihedral angle of 5.22 (9)°. In the crystal, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into chains along the b axis.
doi:10.1107/S160053681102664X
PMCID: PMC3213440  PMID: 22091019
8.  Ethyl 1-[2-(morpholin-4-yl)eth­yl]-2-[4-(morpholin-4-yl)phen­yl]-1H-1,3-benzimidazole-5-carboxyl­ate 
The asymmetric unit of the title compound, C26H32N4O4, consists of two independent mol­ecules. In both mol­ecules, the eth­oxy groups are each disordered over two sets of sites with occupancies of 0.695 (4):0.305 (4) and 0.877 (2):0.123 (2). The dihedral angles between the benzimidazole ring system and the adjacent benzene ring in the two mol­ecules are 41.41 (5) and 31.46 (5)°. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯N inter­actions.
doi:10.1107/S1600536811023294
PMCID: PMC3152030  PMID: 21837149
9.  (E)-2-(3-Chloro­benzyl­idene)-5,6-dimeth­oxy-2,3-dihydro-1H-inden-1-one 
In the title compound, C18H15ClO3, the dihydro­indenone group makes a dihedral angle of 8.56 (6)° with the bezene ring. In the crystal, the mol­ecules are inter­connected into a three-dimensional network via inter­molecular C—H⋯O hydrogen bonds. Weak C—H⋯π and π⋯π [centroid–centroid distances 3.6598 (9)–3.6913 (9) Å] inter­actions are also observed.
doi:10.1107/S1600536810040869
PMCID: PMC3008978  PMID: 21589046
10.  (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
11.  (E)-2-(3,4-Dimeth­oxy­benzyl­idene)-5,6-dimeth­oxy-2,3-dihydro-1H-inden-1-one 
In the title compound, C20H20O5, the 2,3-dihydro-1H-indene ring system is essentially planar [maximum deviation = 0.010 (1) Å] and is inclined at an angle of 4.09 (4)° with respect to the phenyl ring. The C=C bond has an E configuration. In the crystal, the mol­ecules are linked into chains propagating in [102] via inter­molecular C—H⋯O hydrogen bonds. The crystal structure is further consolidated by C—H⋯π inter­actions.
doi:10.1107/S1600536810041619
PMCID: PMC3009320  PMID: 21589057
12.  (E)-5,6-Dimeth­oxy-2-(pyridin-4-yl­methyl­idene)-2,3-dihydro-1H-inden-1-one 
The mol­ecule of the title compound, C17H15NO3, is slightly twisted, with a dihedral angle of 12.12 (3)° between the dihydro­indenone group and the pyridine ring. In the crystal, mol­ecules are connected into layers parallel to the ab plane via inter­molecular C—H⋯O hydrogen bonds. Weak π–π [centroid–centroid distance = 3.5680 (6) Å] inter­actions are also observed.
doi:10.1107/S1600536810039486
PMCID: PMC3009365  PMID: 21588957
13.  (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
14.  5,6-Dimeth­oxy-4′,5′-diphenyl­indane-2-spiro-3′-pyrrolidine-2′-spiro-3′′-indoline-1,2′′-dione 
In the title compound, C33H28N2O4, the central pyrrolidine ring adopts a half-chair conformation. Both the indolinone and indanone groups are twisted, with their five-membered rings adopting a half-chair and an envelope conformation, respectively. The two benzene rings and the mean plane of the indolinone and indanone groups make dihedral angles of 71.98 (10), 84.32 (10), 86.26 (9) and 78.50 (9)°, respectively, with the central pyrrolidine ring. Intra­molecular C—H⋯O hydrogen bonds stabilize the mol­ecular conformation. In the crystal, pairs of inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into centrosymmetric dimers. The dimers are inter­connected into ribbons propagating along [110] via weak inter­molecular C—H⋯O hydrogen bonds. Weak inter­molecular C—H⋯π and π–π [centroid–centroid distance = 3.6509 (11) Å] inter­actions are also observed.
doi:10.1107/S1600536810035865
PMCID: PMC2983396  PMID: 21587525
15.  7-Hy­droxy-6-meth­oxy-2H-chromen-2-one 
The title compound, C10H8O4, is one of the coumarins existing in Morinda citrifolia L (Noni). The chromenone ring system is approximately planar with a maximum deviation of 0.0208 (14) Å. The meth­oxy group does not deviate from this plane [C—O—C—C torsion angle = −1.5 (3)°], indicating that the whole mol­ecule is almost planar. In the crystal packing, inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into chains. These are further connected by C—H⋯O hydrogen bonds.
doi:10.1107/S1600536810029296
PMCID: PMC3007346  PMID: 21588426
16.  Tris[3,5-bis­(trifluoro­meth­yl)phen­yl]phosphine oxide 
In the title compound, C24H9F18OP, an intra­molecular C—H⋯O short contact generates a five-membered ring, producing an S(5) ring motif. The dihedral angles between the benzene rings are 57.68 (10), 77.80 (11) and 79.48 (10)°. Each of the six trifluoro­methyl substituents shows rotational disorder over two positions with refined site-occupany ratios of 0.64 (3)/0.36 (3), 0.649 (14)/0.351 (14), 0.52 (2)/0.48 (2), 0.545 (16)/0.455 (16), 0.774 (9)/0.226 (9) and 0.63 (5)/0.37 (5). The crystal structure is stabilized by inter­molecular C—H⋯O and C—H⋯F inter­actions.
doi:10.1107/S1600536809013488
PMCID: PMC2977759  PMID: 21583895

Results 1-16 (16)