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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]