Aurophilic and hydrogen-bonding interactions in [1-(diphenyl­phosphino)-4-(diphenyl­phos­phin­oyl)­butane-κP¹]iodogold(I) monohydrate

In the title compound, [AuI(C₂₈H₂₈OP₂)]·H₂O, the 1-(di­phenyl­phosphino)-4-(diphenyl­phosphinoyl)butane (dppbO) ligand coordinates through the phospho­rus donor to give a linear two-coordinate P—Au—I gold(I) complex. Pairs of [AuI(dppbO)] molecules are linked by symmetric tris-water hydrogen-bond interactions. These dimers associate in zigzag fashion through intermolecular Au...Au interactions between mutually perpendicular P—Au—I groups.

N-(2-Nitro­phenyl­sulfonyl)glycine methyl ester

The structure of the title compound, C₉H₁₀N₂O₆S, has been determined as part of an ongoing investigation into the preparation of N-allyl-substituted amino acids suitable for alkene cross-metathesis reactions in the generation of combinatorial libraries. The conformational structure is determined by intra- and intermolecular N—H...O and C—H...O hydrogen-bonding interactions.

Methyl 2,3,4-tri-O-acetyl-1-azido-1-deoxy-β-D-gluco­pyran­uronate at room temperature

The structure of the title compound, C₁₃H₁₇N₃O₉, has been determined as part of our continuing investigation into the development of modified sugar amino acid (SAA) scaffolds for dyamic combinatorial libraries of cyclic oligomers. The title compound serves as a viable synthetic precursor and a building block for the synthesis of reversible β-glucosidase inhibitors utilizing target-accelerated in situ click methodologies. The overall structure is stabilized by a number of C—H...O interactions.

Cytosinium 3,5-di­nitro­salicyl­ate

The crystal structure of cytosinium 3,5-di­nitro­salicyl­icate (systematic name: 6-amino-2-oxo-2,3-di­hydro­pyrimidinium 3,5-di­nitro­salicyl­ate), C₄H₆N₃O⁺·C₇H₃N₂O₇^-, shows the presence of a primary heteroionic cyclic R₂²(8) interaction between the H-atom donors of the protonated cytosinium cation and the carboxyl­ate O-atom acceptors of the 3,5-di­nitro­salicyl­ate anion. Additional peripheral hydrogen-bonding interactions involving all available cytosinium H-atom donors and both phenol and nitro O-atom acceptors of the anion species give a three-dimensional polymeric structure.

Tetra­kis[4-(trifluoro­meth­yl)phen­yl]stannane

The Sn atom in the title compound, [Sn(C₇H₄F₃)₄], is located on a site of symmetry and has tetra­hedral geometry, with an Sn-C bond distance of 2.149 (4) Å, and C-Sn-C bond angles of 107.89 (19) and 112.7 (4)°.

N,N'-Ethyl­enedisuccin­imide

The title compound, C₁₀H₁₂N₂O₄, crystallizes as discrete mol­ecules disposed about crystallographic centres of symmetry, with two independent half-mol­ecules constituting the asymmetric unit of the unit cell. The succin­imide rings are essentially planar. No unusual features are observed in the molecular geometry.

Succinimido 4-(N-maleimido­methyl)­cyclo­hexane­carboxyl­ate

The title compound {alternative name: 2,5-dioxo-3-pyrrolidin-1-yl 4-[(2,5-dioxo-3-pyrrolin-1-yl)­methyl]­cyclo­hexane­car­box­yl­ate}, C₁₆H₁₈N₂O₆, crystallizes as discrete mol­ecules separated by normal van der Waals interactions. The succin­imide ester and male­imide subunits occupy equatorial positions on the cyclo­hexane ring.

(Z,Z)-3,6-Bis[(3,4,5-trimethoxy­phen­yl)methyl­ene]piperazine-2,5-dione

The title compound, C₂₄H₂₆N₂O₈, is a derivative of neihumicin, a cytotoxic antibiotic from Micromonospora neihuensis. The compound crystallizes as discrete mol­ecules with crystallographic inversion symmetry. Inter­molecular N—H...O hydrogen bonds yield polymeric chains along the c axis. The trimethoxy­phenyl­methyl­ene side chain is found to be in a Z configuration about the C=C double bond.

N-(2-Nitro­benzene­sulfonyl)-L-alanine methyl ester

The structure of the title compound, C₁₀H₁₂N₂O₆S, has been determined as part of an ongoing investigation into the preparation of substituted amino acids suitable for the generation of combinatorial libraries. The molecular conformation is stabilized by intra- and intermolecular N—H...O and C—H...O hydrogen-bonding interactions.

1-(4-Bromo­phenyl)-2-(2-propenyl­sulfonyl)­ethano­ne

The title compound, C₁₁H₁₁BrO₃S, was prepared by reaction of sodium allyl­sulfinate with p-bromo­phen­acyl bromide to confirm the identity of the former.

Brucinium 2-carb­oxy-6-nitro­phthalate dihydrate: the 1:1 proton-transfer compound of brucine with 3-nitro­phthalic acid

In the title compound (systematic name: 2,3-dimeth­oxy-10-oxostrychnidinium 2-carb­oxy-6-nitro­phthalate dihydrate), C₂₃H₂₇N₂O₄⁺·C₈H₄NO₆⁻·2H₂O, the carboxylic acid and carboxyl­ate groups of the hydrogenphthalate anions form head-to-tail catemeric chains of strong inter­molecular O—H...O hydrogen bonds [O...O distance = 2.563 (5) Å] along the 2₁ screw axes parallel to the a axis. The chains further associate with the water mol­ecules, forming sheet structures parallel to (010). The protonated N atom at the 19-position of the brucine mol­ecule forms a peripheral inter­molecular hydrogen bond with the carboxyl­ate group of the anion.

Brucinium toluene-4-sulfonate trihydrate at 130 K

The low-temperature (130 K) structure of the 1:1 proton-transfer compound of brucine with toluene-4-sulfonic acid (systematic name: 2,3-dimeth­oxy-10-oxostrychnidinium toluene-4-sulfonate trihydrate), C₂₃H₂₇N₂O₄⁺·C₇H₇O₃S^-·3H₂O, has been determined. The asymmetric unit contains two cations, two anions and six molecules of water. Brucinium cations form the familiar undulating head-to-tail ribbon structures, which associate with the toluene-4-sulfonate anions and the water mol­ecules in the inter­stitial cavities through hydrogen-bonding associations involving all available donor and acceptor atoms on all species. The result is a framework polymer structure.

Methyl 3,4-O-dibenzoyl-2-O-benzyl-1-thio-β-L-fucopyran­oside

The title compound, C₂₈H₂₈O₆S, is a protected fucose donor, synthesized as part of our investigations into the preparation of complex oligosaccharides. The benzoyl groups are equatorial and axial, while the thio­ether and ether groups are equatorial. The carboxyl­ate O atoms form a number of intra- and inter­molecular C—H...O inter­actions.

4-(2-Thien­yl)-1H-pyrrole-2-carbaldehyde

The thienyl and pyrrole rings in the mol­ecule of the title compound, C₉H₇NOS, are not coplanar, their planes forming a dihedral angle of 14.7 (3)°; the C—C bond linking the rings almost coincides with the line of inter­section of the planes of the rings. The mol­ecules in the crystal structure form centrosymmetric dimeric aggregates, held together by means of N—H...O hydrogen bonds.