ABSTRACT
In the title compound, C21H23NO3S, both the thia-zole and oxazolidine rings adopt twist conformations. The mean plane of the thia-zole ring makes a dihedral angle of 61.02â (7)° with the oxazolidine ring mean plane, and dihedral angles of 22.72â (6) and 75.07â (6)° with the benzene rings. The benzene rings are almost perpendicular to one another, making a dihedral angle of 89.14â (6)°. There are bifurcated intra-molecular C-Hâ¯O hydrogen bonds in the mol-ecular structure. In the crystal, mol-ecules are linked via C-Hâ¯π inter-actions, forming chains propagating along [100].
ABSTRACT
In the title compound, C19H19NO3S, the thia-zole and oxazolidine rings each adopt an envelope conformation, with the S and O atoms as the respective flap atoms. The thia-zole and oxazolidine rings (all atoms) make a dihedral angle of 66.39â (11)° while the phenyl rings subtend a dihedral angle of 22.71â (10)°.
ABSTRACT
In the title compound, C27H30N2O4, the pyrrolidine ring adopts a twisted conformation. The indoline ring system is almost perpendicular to the mean plane of the pyrrolidine ring, making a dihedral angle of 81.7â (8)°. In the crystal, mol-ecules are linked into centrosymmetric dimers with graph-set motif R2(2)(16) via pairs of C-Hâ¯O hydrogen bonds. The terminal ethyl group of the ester group is disordered over two sets of sites, with a site-occupancy ratio of 0.587â (11):0.413â (11).
ABSTRACT
In the title compound, C26H31NO4, the five-membered rings of the central pyrrolizine system adopt N-envelope conformations. The ethyl acetate group adopts an extended conformation. The dihedral angle between the benzene rings is 36.6â (1)°. In the crystal, C-Hâ¯O hydrogen bonds form a zigzag chain running along the b-axis directions. The crystal structure is futher consolidated by C-Hâ¯π inter-actions.
ABSTRACT
In the title compound, [Fe(C5H5)(C16H15O3)], the cyclo-penta-dienyl rings are in an eclipsed conformation and the benzene ring makes dihedral angles of 10.84â (9) and 12.35â (9)°, respectively, with the substituted and unsubstituted cyclo-penta-dienyl rings. In the crystal, mol-ecules form inversion dimers through pairs of O-Hâ¯O hydrogen bonds. Weak C-Hâ¯O hydrogen bonds are observed between the dimers.
ABSTRACT
The title compound, C19H18O3, crystallizes with three mol-ecules (A, B and C) in the asymmetric unit. The carbonyl O atom shows positional disorder over two sites in mol-ecules A and B; the site-occupancy ratios are 0.76â (3):0.24â (3) and 0.86â (3):0.14â (3), respectively. The ethyl-ene fragments in each mol-ecule have an E conformation, while the C-O-C-C torsion angles indicate near planarity. The dihedral angles formed by the aromatic rings are 20.0â (1), 23.7â (1) and 16.1â (1)° for mol-ecules A, B and C, respectively. Intra-molecular C-Hâ¯O hydrogen bonds occur in each mol-ecule.
ABSTRACT
In the title compound, C(28)H(24)ClNO(3), the dihedral angles between the central benzene ring and the indole ring system and the chlorobenzene ring are 70.81â (5) and 78.62â (5)°, respectively. The mol-ecular structure is stabilized by a weak intra-molecular C-Hâ¯O inter-action. In the crystal, pairs of C-Hâ¯O hydrogen bonds link the mol-ecules into inversion dimers with an R(2) (2)(14) motif.
ABSTRACT
In the title compound, C24H23N5O3, the oxindole ring system is nearly planar, with a dihedral angle between the two fused rings of 3.3â (1)°. In the fused pyrrolo-oxazole ring system, the oxazole and pyrrolidine rings adopt envelope conformations with the spiro C atom and one of the methyl-ene C atoms, respectively, as the flap atoms. In the crystal, mol-ecules are linked into a helical chain along the b axis via C-Hâ¯O inter-actions generating R 2 (1)(7) and R 2 (2)(8) ring motifs.
ABSTRACT
In the title compound, C29H28N2O4, the indoline ring system is essentially planar, with a maximum deviation of 0.027â (2)â Å; the carbonyl O atom lies 0.102â (1)â Å out of the least-squares plane of the indole ring. The pyrrolidine ring adopts a C-envelope conformation, with a C atom displaced by 0.643â (2)â Å from the mean plane formed by the remaining ring atoms. The pyrrolidine ring makes a dihedral angle of 86.1â (8)° with the indoline ring system. In the crystal, N-Hâ¯O hydrogen bonds result in the formation of cyclic centrosymmetric dimers [R2(2)(8)]. C-Hâ¯π inter-actions also occur, leading to a chain along the b-axis direction. There is a rather weak π-π electron inter-action between the pyrrazole and benzene rings, with a centroid-centroid distance of 3.765â (1)â Å.
ABSTRACT
In the title compound, C33H29NO4, the acenaphthyl-ene ring system is essentially planar (r.m.s. deviation = 0.0290â Å). The pyrrolidine ring adopts a C-envelope conformation with a C atom displaced by 0.671â (2)â Å from the mean-plane formed by the remaining ring atoms. The pyrrolidine ring is fused to acenaphthyl-ene ring system making a dihedral angle of 88.0â (7)°. In the crystal, mol-ecules are linked into R(2)2(9) dimers via C-Hâ¯N and C-Hâ¯O hydrogen bonds. Two C atoms act as donors to the same O atom acceptor, resulting in the formation of R(2)1(7) ring motifs. These two motifs combine to form hydrogen-bonded sheets running along the a- and b-axis directions.
