41 research outputs found

    Ethyl 1-(2-hy­droxy­eth­yl)-2-(4-meth­oxy­phen­yl)-1H-benzimidazole-5-carboxyl­ate monohydrate

    Get PDF
    In the title mol­ecule, C19H20N2O4·H2O, the benzimidazole ring system is essentially planar [maximum deviation = 0.013 (11) Å] and is inclined to the 4-meth­oxy­phenyl ring by 30.98 (5)°. In the crystal, O—H⋯O and O—H⋯N hydrogen bonds involving the water mol­ecule link neighbouring mol­ecules, forming a two-dimensional network lying parallel to the bc plane. There are also C—H⋯π and π–π inter­actions present. The latter involve inversion-related benzimidazole rings with centroid–centroid distances of 3.5552 (8) and 3.7466 (8) Å

    3β-Chloro-6-[2-(2-cyano­acet­yl)hydrazin-1-yl­idene]-5α-cholestane

    Get PDF
    The asymmetric unit of the title compound, C30H48ClN3O, contains two mol­ecules, A and B. In both mol­ecules, the three cyclo­hexane rings in the steroid fused ring systems adopt chair conformations, while the cyclo­pentane rings adopt envelope and twist conformations in mol­ecules A and B, respectively. In mol­ecule B, the cyano group is disordered over two orientations with refined site-occupancies of 0.593 (8) and 0.407 (8). An intra­molecular C—H⋯N inter­action forms an S(10) ring in both mol­ecules. In the crystal, mol­ecules are linked by N—H⋯O, C—H⋯O and C—H⋯N inter­actions, resulting is chains propagating along the a-axis direction

    5-[(E)-4-Fluoro­benzyl­idene]-8-(4-fluoro­phen­yl)-2-hy­droxy-9-phenyl-3,10-diaza­hexa­cyclo­[10.7.1.13,7.02,11.07,11.016,20]henicosa-1(20),12,14,16,18-pentaen-6-one

    Get PDF
    In the title compound, C38H28F2N2O2, the piperidine ring adopts a chair conformation and the pyrrolidine ring adopts an envelope conformation with the spiro C atom as the flap atom. The naphthalene ring system makes dihedral angles of 39.89 (8), 35.33 (8) and 46.45 (8)° with the two fluoro-substituted benzene rings and the phenyl ring, respectively, while the dihedral angle between the two fluoro-substituted benzene rings is 75.21 (10)°. An intra­molecular O—H⋯N hydrogen bond generates an S(5) ring. In the crystal, mol­ecules are connected by C—H⋯O hydrogen bonds, forming supra­molecular chains propagating along the c-axis direction. Weak C—H⋯π inter­actions further consolidate the structure

    11-[(E)-Benzyl­idene]-14-hy­droxy-8-phenyl-3,13-diaza­hepta­cyclo­[13.7.1.19,13.02,9.02,14.03,7.019,23]tetra­cosa-1(22),15,17,19(23),20-pentaen-10-one

    Get PDF
    In the title compound, C35H30N2O2, the piperidine ring adopts a chair conformation and the pyrrolidine ring adopts an envelope conformation. The naphthalene ring makes dihedral angles of 24.56 (3) and 36.13 (4)° with the terminal phenyl rings. The dihedral angle between the two terminal phenyl rings is 55.27 (5)°. One of the C atoms in the pyrrolidine ring is disordered over two sites, with a refined occupany ratio of 0.670 (3):0.330 (3). An intra­molecular O—H⋯N hydrogen bond generates an S(6) ring. In the crystal structure, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R 2 2(18) loops within sheets of mol­ecules lying parallel to the bc plane

    6-Chloro-3-phenethyl-2-thioxo-2,3-di­hydro­quinazolin-4(1H)-one

    Get PDF
    The asymmetric unit of the title quinazolinone compound, C16H13ClN2OS, consists of two crystallographically independent mol­ecules, A and B. The dihedral angles between the quinazoline and benzene rings are 16.88 (6) and 32.34 (6)° for mol­ecules A and B, respectively. In the crystal structure, mol­ecules A and B are linked by two bifurcated inter­molecular N—H⋯S and C—H⋯S hydrogen bonds. Pairs of mol­ecules are further linked by C—H⋯O and C—H⋯Cl hydrogen bonds into a chain aligned approximately along [110]

    Kemudahan dan perkhidmatan maklumat di Kolej bersekutu uitm: satu kajian

    Get PDF
    Libraries in universities and university colleges are there to serve their users in their quest for information. Various information services and facilities are provided to satisfy their users’ needs. This study looks at facilities and services provided by the libraries in five UiTM affiliated colleges within the Klang Valley. The qualitative study looks at eleven areas and the results are benchmarked against Persatuan Pustakawan Malaysia’s guidelines for college libraries

    Ethyl 1-sec-butyl-2-(4-methoxy­phen­yl)-1H-benzimidazole-5-carboxyl­ate

    Get PDF
    In the title mol­ecule, C21H24N2O3, the dihedral angle between the benzene and imidazole rings is 66.33 (13)°. The imidazole ring is essentially planar, with a maximum deviation of 0.004 (2) Å. In the crystal structure, mol­ecules are connected by weak C—H⋯O hydrogen bonds, forming chains along the b axi

    3β-Chloro-5α-cholestan-6-one

    Get PDF
    The asymmetric unit of the title compound, C27H45ClO, consists of two crystallographically independent mol­ecules. In both mol­ecules, the three cyclo­hexane rings in the steroid fused-ring systems adopt chair conformations, while the cyclo­pentane ring adopts a half-chair conformation in one mol­ecule and an envelope conformation in the other. In the crystal, the mol­ecules are linked into a two-dimensional network by weak C—H⋯O hydrogen bonds. The crystal studied is a nonmerohedral twin with a refined ratio of twin components of 0.264 (3):0.736 (3)

    14-Hy­droxy-11-[(E)-4-meth­oxy­benzyl­idene]-8-(4-meth­oxy­phen­yl)-5-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

    Get PDF
    In the title compound, C36H32N2O4S, the piperidine ring adopts a chair conformation, while the five-membered pyrrolidine (with a C atom as the flap atom) and thia­zolidine (with the S atom as the flap atom) rings adopt envelope conformations. The naphthalene ring system makes dihedral angles of 18.82 (5) and 40.92 (5)° with the two meth­oxy-substituted benzene rings. In the crystal, centrosymmetrically-related mol­ecules are linked into dimers via pairs of C—H⋯O and C—H⋯N hydrogen bonds. An intra­molecular O—H⋯N hydrogen bond is also observed. The crystal structure is further stabilized by C—H⋯π inter­actions

    Ethyl 4-fluoro-3-nitro­benzoate

    Get PDF
    In the title compound, C9H8FNO4, C—H⋯O inter­molecular inter­actions form dimers with R 2 2(10) motifs. These dimers are arranged into chains parallel to the b axis and the chains are stacked down the c axis
    corecore