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2-O-Benzhydryl-3,4-(S)-O-benzyl-idene-d-lyxono-1,4-lactone.

ABSTRACT: X-ray crystallography unequivocally showed that protection of the free hydroxyl group of 3,5-O-benzyl-idene-d-lyxono-1,4-lactone with diphenyl-diazo-methane proceeded with retention of configuration to give the title compound, C(25)H(22)O(5). The crystal structure consists of layers of inter-locked mol-ecules lying parallel to the a axis.

SUBMITTER: Jenkinson SF

PROVIDER: S-EPMC2914987 | biostudies-literature |

REPOSITORIES: biostudies-literature

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2-O-Benzhydryl-3,4-(S)-O-benzyl-idene-d-xylono-1,4-lactone.

Project description:X-ray crystallography unequivocally shows that protection of the free hydroxyl group of 3,5-O-benzyl-idene-d-xylono-1,4-lactone with diphenyl-diazo-methane proceeded smoothly to give the title compound, C(25)H(22)O(5), with no accompanying epimerization. Unlike the analogously protected lyxono lactone, the isomeric xylono lactone has two mol-ecules present in the asymmetric unit (Z' = 2). The 5-ring lactones adopt envelope conformations and the 6-ring ketals adopt chair conformations.

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N,N'-Bis(3,4-dimethoxy-benzyl-idene)butane-1,4-diamine.

Project description:The title Schiff base compound, C(22)H(28)N(2)O(4), was synthesized by the reaction of 3,4-dimethoxy-benzaldehyde and 1,4-diamino-butane in methanol. The mol-ecule is located on a center of inversion with one half-mol-ecule in the asymmetric unit. Both C=N double bonds are in a trans configuration. Inter-molecular C-H?O hydrogen bonds link the mol-ecules into a three-dimensional network.

| S-EPMC2977286 | biostudies-literature

2,3-O-(S)-Benzyl-idene-2-C-methyl-d-ribono-1,4-lactone.

Project description:The crystal structure of the title compound, C(13)H(14)O(5), establishes (i) the (S) - rather than (R) - configuration at the acetal carbon and (ii) that both the acetal and the lactone form five- rather than six-membered rings; the absolute configuration is determined by the use of 2-C-methyl-d-ribono-1,4-lactone as the starting material. The compound consists of hydrogen-bonded chains of mol-ecules running along the a axis; there are no unusual packing features. Only classical hydrogen bonding has been considered.

| S-EPMC2969893 | biostudies-literature

N'-(3,4-Dimethoxy-benzyl-idene)acetohydrazide.

Project description:In the title mol-ecule, C(11)H(14)N(2)O(3), the acetohydrazide group is planar 0.084?(1)?Å and forms a dihedral angle of 19.7?(1)° with the benzene ring. One of the meth-oxy groups is coplanar with the attached benzene ring within 0.052?(3)?Å, whereas the other is slightly twisted [C-O-C-C = 6.3?(3)°]. The mol-ecule adopts a trans configuration with respect to the C=N bond. In the crystal, the mol-ecules are linked into chains along the a axis by N-H?O hydrogen bonds and the chains are cross-linked into a three-dimensional network by C-H?O hydrogen bonds.

| S-EPMC2977411 | biostudies-literature

N'-(3,4-Dihydroxy-benzyl-idene)acetohydrazide.

Project description:In the title compound, C(9)H(10)N(2)O(3), the Schiff base mol-ecule is approximately planar, the dihedral angle between the benzene ring and the acetohydrazide group (r.m.s. deviation = 0.034 Å) being 8.81 (7)°. An intra-molecular O-H⋯O hydrogen bond is observed. In the crystal, mol-ecules are linked into a three-dimensional network by O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds.

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N'-(3,4-Dihydroxy-benzyl-idene)acetohydrazide monohydrate.

Project description:In the title compound, C(9)H(10)N(2)O(3)·H(2)O, the Schiff base mol-ecule is approximately planar, the dihedral angle between the benzene and acetohydrazide planes being 5.40?(7)°. An intra-molecular O-H?O hydrogen bond is observed. In the crystal, mol-ecules are linked into a two-dimensional network parallel to (100) by O-H?O, N-H?O, O-H?N and C-H?O hydrogen bonds, and by ?-? inter-actions between symmetry-related benzene rings [centroid-centroid distance = 3.543?(2)?Å].

| S-EPMC2977139 | biostudies-literature

N'-(3,4-Dimethoxy-benzyl-idene)aceto-hydrazide.

Project description:The asymmetric unit of the title compound, C(11)H(14)N(2)O(3), contains two independent mol-ecules with close conformations; the C=N-N-C torsion angle is 176.4?(1)° in both mol-ecules. In the crystal, inter-molecular N-H?O and C-H?O hydrogen bonds link the mol-ecules into chains running along the [01] direction.

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(2Z)-2-Benzyl-idene-4-n-butyl-3,4-di-hydro-2H-1,4-benzo-thia-zin-3-one.

Project description:In the title compound, C19H19NOS, the six-membered hetero-cyclic ring of the benzo-thia-zine fragment exhibits a screw boat conformation. The plane of the fused benzene ring makes a dihedral angle of 72.38?(12)° with that of the terminal phenyl ring, and is nearly perpendicular to the mean plane formed by the atoms through the n-butyl chain, as indicated by the dihedral angle of 88.1?(2)°. In the crystal, mol-ecules are linked by C-H?O inter-actions to form supra-molecular chains along [110].

| S-EPMC4051051 | biostudies-literature

(1S)-1,2-O-Benzyl-idene-?-d-glucurono-6,3-lactone.

Project description:X-ray crystallographic analysis has established that the major product from the protection of d-glucoronolactone with benzaldehyde is (1S)-1,2-O-benzyl-idene-?-d-glucurono-6,3-lactone, C(13)H(12)O(6), rather than the R epimer. The crystal structure exists as O-H?O hydrogen-bonded chains of mol-ecules lying parallel to the a axis. The absolute configuration was determined by the use of d-glucuronolactone as the starting material.

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3-(3,4-Dichloro-benzyl-idene)chroman-4-one.

Project description:The distinctive feature of the structure of the title compound, C(16)H(10)Cl(2)O(2), is the formation of a zigzag chain along [100] via Cl?Cl inter-actions [3.591?(1) and 3.631?(1)?Å]. The chroman-one moiety is fused with the benzene ring and adopts a half-chair conformation. The dihedral angle between the benzene ring of the chromanone moiety and the dichlorobenzene plane is 56.14?(8)°.

| S-EPMC3515170 | biostudies-literature

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