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The single-crystal X-ray structure determinations of the title complexes, cis-di­chloro- trans-di­methyl- cis-bis( N-methyl­pyr­rolidin-2-one- O)­tin(IV), [Sn(CH3)2Cl2(C5H9NO)2], cis-di­bromo- trans-di­methyl- cis-bis( N-methyl­pyrrolidin-2-one- O)tin­(IV), [SnBr2(CH3)2(C5H9NO)2], and cis-di­iodo- trans-di­methyl- cis-bis( N-methyl­pyrrolidin-2-one- O)­tin(IV), [Sn(CH3)2I2(C5H9NO)2], show that those tin complexes in which coordination of the lactam ligand to SnIV is realized via oxygen exhibit a distorted octahedral geometry. [ABSTRACT FROM AUTHOR]

The title compound, di-μ-chloro-bis{[(2,3,4-η)-ethyl 6,6-di­methyl-5-oxohept-2-enoato]­palladium(II)}, [Pd2Cl2(C11­H17­O3)2], is a binuclear chloro-bridged palladium allyl complex that was obtained serendipitously From the reaction of 6,6-di­methyl-2-hepten-4-ynoate with Na2PdCl4 in water-containing alcohol. The allyl group is substituted with an ester and a tert-butyl­carboxy group. The dimeric mol­ecules link via C-H⃛O contacts into a two-dimensional network parallel to the bc plane. [ABSTRACT FROM AUTHOR]

Stereoselective hydroboration of (−)-isopulegol and subsequent fractional crystallization furnishes the title compound, C10H20O2. The relative configuration of the stereogenic centres has been assigned by means of X-ray diffraction analysis since the monoterpenediol is employed as a versatile chiral building block in stereospecific natural product synthesis. [ABSTRACT FROM AUTHOR]

Esterification of a single diastereomer of 2-(4-methylene­cyclohex-2-enyl)propanol, (II), with (1 R,4 S)-(+)-camphanic acid [(1 R,4 S)-4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1-carboxylic acid] leads to the crystalline title compound, C20H28O4. The relative configuration of the camphanate was determined by X-ray diffraction analysis. The outcome clarifies the relative and absolute stereochemistry of the naturally occurring bisabolane sesquiterpenes β-turmerone and β-sesquiphellandrene, since we have converted (II) into both natural products via a stereospecific route. [ABSTRACT FROM AUTHOR]

The preparation and X-ray analysis of the title compound, [Sn2Br4(CH3)4(C5H9NO)], are described. The compound contains two Sn atoms in the asymmetric unit, that complexed by N-methyl­pyrrolidin-2-one being hexacoordinated ( a), the other exhibiting pentacoordination ( b). The most important features are three different Sn-Br bond lengths at both Sn atoms with the following values: ( a) 2.5060 (9), 2.7152 (10) and 3.7118 (10) Å; ( b) 2.5084 (10), 2.5279 (9) and 3.5841 (10) Å. [ABSTRACT FROM AUTHOR]

The synthesis and the X-ray structural analysis of the title compound, μ-chloro-1:2κ2 Cl-tri­chloro-1κ Cl,2κ2 Cl-tetra­methyl-1κ2 C,2κ2 C-( N-methyl­pyrrolidin-2-one)-1κ O-ditin(IV), [Sn2Cl4(CH3)4(C5H9NO)], are described. The title compound is found to exhibit a distorted trigonal-bipyramidal geometry at both SnIV atoms. The Sn-Cl-Sn angle involving the bridging chlorine ligand is 135.56 (5)°, with the Sn-Cl bond lengths being 2.5704 (13) and 3.1159 (13) Å. [ABSTRACT FROM AUTHOR]

The synthesis and X-ray structure analysis of the title compound, [SnBr2(CH3)2(C4H9NO)2], are described. The crystal contains mol­ecules which are separated by normal van der Waals distances. Organotin(IV) compounds are found in a variety of structural types, in which the Sn atom can, for example, be hexacoordinated. In this case, the preferred solid-state molecular structure of the central atom is octahedral. The degree of distortion and the configuration depend on the ligands. [ABSTRACT FROM AUTHOR]

The synthesis and crystal structure analysis via X-ray diffraction of the title compound, C20H24O4, (I), are described. The title compound is an androstadione bearing a diene in the A and B rings [Krause & Thorand (1999). Inorg. Chim. Acta, 296, 1-11]. The diene conjugates with the carbonyl group. Intermolecular H⃛O contacts (2.53 and 2.64 Å; C-H⃛O angles 161 and 158°) indicate hydrogen bonds. [ABSTRACT FROM AUTHOR]

The crystal structure of the title compound, C10H20O2, was published [Körner et al. (2000). Acta Cryst. C 56, 74-75] with an erroneous position for an hydroxy H atom. This has now been corrected and leads to a more sensible hydrogen-bonding scheme. [ABSTRACT FROM AUTHOR]

The synthesis, spectroscopic data and X-ray structural analysis of the title compound, C26H35NO2S, (I), are described. The crystal contains discrete mol­ecules separated by normal van der Waals distances. The benzene­sulfon­amide derivative of the corresponding amine allows the assigment of its relative configuration. The secondary amine has been synthesized via a sequential multi-step hydro­formyl­ation procedure according to Eilbracht et al. [ Chem. Rev. (1999), 99, 3329-3365].). [ABSTRACT FROM AUTHOR]

The title compound, C12H16O4, (I), was prepared by oxidation of (5 S*,6 R*)-1,7-di­oxa­di­spiro­[4.0.4.4]­tetra­decane-2,8-diol us­ing silver(I) carbonate and posesses a cis configuration of the two five-membered-ring lactones fused spiro to the six-membered carbocycle, which has a chair conformation. It represents an exceptional structure for bis-tetra­hydro­furan units, which are interesting building blocks in natural products. The synthesis, spectroscopic data and X-ray structural analysis are described. The crystal contains discrete mol­ecules separated by normal van der Waals distances. [ABSTRACT FROM AUTHOR]

The title compound, C16H26O2, (I), prepared by oxidation of (1 R*,11 R*)-12-hydroxy­bi­cyclo­[9.4.1]­hexa­decan-16-one using pyridinium dichromate, has a trans configuration of the two fused rings and represents an interesting precursor for the synthesis of macrocyclic structures. [ABSTRACT FROM AUTHOR]

The title compound, C23H19N2O3P, was prepared by the reaction of ethynyldi­phenyl­phosphine oxide with phenyl isocyanate, triethyl­amine and nitoethane in benzene. The molecular structure is stabilized by an intramolecular N-H⋯O hydrogen bond. [ABSTRACT FROM AUTHOR]

The title compound, di­bromo­di­methyl( N-methyl­pyrrolidin-2-one- O)­tin(IV), [SnBr2(CH3)2(C5H9NO)], exhibits pentacoordination of the Sn atom, with long and short Sn-Br bonds [2.6737 (4) and 2.5256 (4) Å, respectively]. The distorted trigonal-bipyramidal coordination polyhedron has two methyl groups and one Br atom in the equatorial plane, the second Br atom and the N-methyl­pyrrolidinone (NMP) ligand occupying the apical positions. [ABSTRACT FROM AUTHOR]

The article focuses on the crystallization of the compound tris(cyclohexylmethyl)amine. The compound formed is a sterically hindered amine with three cyclohexane rings having chair conformations. In the experiment a solution of cyclohexene in dioxane, methanol and glacial acetic acid in the presence of urea was treated under hydroaminomethylation conditions. The mixture was extracted with ethyl acetate.

The title compound, C18H29IO3, features a trans-fused bicyclic system. The carbonyl group lies on the same side as the carbethoxy function and iodine. The six-membered ring has a chair conformation. [ABSTRACT FROM AUTHOR]

The title compound, C25H29NO3, was prepared in the course of the generation of depsipeptide libraries resembling the Jasplakinolide family of natural products. The dihedral angle between the phenyl ring planes is 74.1 (3)° The oxazolidinone ring adopts a slightly distorted 4 E conformation with an axial projection of the isopropyl substituent, which is easily rationalized by pseudo-allylic strain exerted by the exocyclic imide carbonyl. The two carbonyl groups adopt a noncolinear S-shaped conformation. [ABSTRACT FROM AUTHOR]

The molecule of the title compound, C20H34O4, is centrosymmetric. In the crystal structure, a network of O—H...O hydrogen bonds result in each molecule being linked to four neighbouring molecules and a two-dimensional net is formed. [ABSTRACT FROM AUTHOR]

The chiral title compound, C17H20ClNO5, arose as a side product during the synthesis of novel furanomycin derivatives. The stereochemistry at the bicyclic core is consistent with a halolactonization step. The five-membered rings are nearly perpendicular to each other [torsion angle at the common bond: −88.3 (3)°]. [ABSTRACT FROM AUTHOR]

The title compound, C12H15ClF3NO4, is a side product in a synthesis of novel furanomycin derivatives. The stereochemistry at the bicyclic core is consistent with a halolactonization step. However, racemization also occurred via an unknown mechanism. The five-membered rings are nearly perpendicular to each other [torsion angle at the common bond: −95.6 (2)°]. [ABSTRACT FROM AUTHOR]

The title compound, C8H12O3, was synthesized to prove the relative configuration in the projected total synthesis of curvicollides A–C. In the crystal structure, molecules are linked via a bifurcated O—H...O hydrogen bond and a chain of molecules is formed along the a axis. [ABSTRACT FROM AUTHOR]

The title compound, C20H27NO4, is a synthetic inter­mediate towards the preparation of novel furan­omycin derivatives. Its structure is consistent with the assumed anti selectivity of the allenylation step. [ABSTRACT FROM AUTHOR]

The title compound, C17H32N4, contains two piperazine heterocycles, which are methyl­ene bridged. The rings have chair conformations, with all substituents equatorial. [ABSTRACT FROM AUTHOR]

The title compound, C21H26N2, a potential chiral ligand for transition metal-catalysed reactions, crystallizes with one mol­ecule in the asymmetric unit; the mol­ecule has a pseudo-twofold axis perpendicular to the central C=C=C fragment. [ABSTRACT FROM AUTHOR]

The crystal structure of the title compound, C11H12O, a substrate for gold-catalysed cyclo­isomerization reactions [Hoffmann-Röder & Krause (2001). Org. Lett. 3, 2537–2538], contains two mol­ecules in the asymmetric unit. There are two inter­molecular O—H ⋯ O hydrogen bonds in the crystal structure and a chain of mol­ecules is formed along the c axis via these hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C14H30O4Si, the bond angles around Si are in the range 105.4 (3)–112.1 (4)° and the tetra­hydro­furan ring adopts a distorted envelope conformation. There is one intra­molecular and one inter­molecular O—H⋯O hydrogen bond in the crystal structure. A spiral of mol­ecules forms around the 41 axis ( c axis) of the crystal structure via the inter­molecular O—H⋯O hydrogen bond. [ABSTRACT FROM AUTHOR]

The title compound, C20H19F3N2O4, crystallizes with two mol­ecules in the asymmetric unit. The important characteristics of the mol­ecule are the two C=N bonds in Z,E configuration, one in the β-methoxy-system and the other in the oxy­methyl side chain between the two aromatic rings. [ABSTRACT FROM AUTHOR]

The crystal structure of the title compound, C20H19F3N2O4, contains one mol­ecule in the asymmetric unit. The CF3 group is disordered over two positions. The important characteristics of the mol­ecule are the two C=N bonds in an E,Z-configuration, viz. E in the β-methoxy system and Z in the oxymethyl chain between the two aromatic rings. [ABSTRACT FROM AUTHOR]

The crystal structure of the title compound, C19H17F3N2O4, a metabolite of the fungicide trifloxy­strobin (TFS), contains one mol­ecule in the asymmetric unit. The CF3 group is disordered over two positions. The important characteristics of the mol­ecule are the two C=N bonds in an E,E configuration, one in the β-methoxy system and the other in the oxy­methyl side chain between the two aromatic rings. The mol­ecules are linked via an O—H⋯N hydrogen bond and an infinite spiral is formed along the b-axis direction. [ABSTRACT FROM AUTHOR]

The chiral title compound, C28H26O2, with potential uses in the synthesis of aza­macroheterocycles, shows a locked S-configuration for the binaphthyl unit. The diolefinic building blocks were prepared as diallylic ethers of ( S)-1,1′-binaphthol. The dihedral angle between the least-squares planes of the bicyclic ring systems is 68.53 (3)°. The mol­ecule resides on a twofold axis. [ABSTRACT FROM AUTHOR]

The chiral title compound, C12H17OP, with potential uses in asymmetric induction in homogeneous catalysed reactions, shows an s- cis conformation for the C=C—P=O unit, in common with related materials. [ABSTRACT FROM AUTHOR]