Search results for "Cyclohexane"

Hydrodynamisches verhalten gelöster polydimethylsiloxane

1962

Es wird uber Sedimentations-, Diffusions- und Viskositatsmessungen an Polydimethylsiloxan berichtet. Als Θ-Losungsmittel diente Bromcyclohexan, das bei 28°C die Beziehung liefert, sowie als gutes Losungsmittel Toluol von 25°C mit Die Reibungs- und Viskositatswerte erlauben die Berechnung des Tragheitsradius r im Θ-Losungsmittel zu rΘ = 0,27·M1/2. Dieser Radius rΘ ist nur etwa um 40% groser als der Radius rf bei vollig freier Drehbarkeit. Die Polydimethylsiloxankette ist folglich sehr flexibel. Measurements of sedimentation, diffusion and viscosity were performed on polydimethylsiloxanes in a Θ solvent (bromocyclohexane of 28°C.) and in a good solvent (toluene of 25°C.). The molecular weight…

Über die lösungswärme von polystyrol in verschiedenen lösungsmitteln

1951

An einem Polystyrol mit einem Molekulargewicht von ca. 20 000 werden die Losungs-warmen in verschiedenen Losungsmitteln in einem Kalorimeter bestimmt. Die meisten Losungsvorgange verlaufen exotherm, in einem Fall (Cyclohexan) wird jedoch bei der Auflosung Warme von der Umgebung aufgenommen. Es wird festgestellt, das die Trocknung der Praparate sehr wichtig fur die Reproduzierbarkeit der Messungen ist. Ferner wird orientierend die Abhangigkeit der Losungswarme vom Polymerisationsgrad sowie von der Konzentration der entstehenden Losung festgestellt. Es wird auserdem orientierend die Mischungswarme von Athylbenzol in verschiedenen Losungsmitteln bestimmt. Measurements of the heat of solution o…

ChemInform Abstract: Iodine-Induced Stereoselective Carbocyclizations - A New Method for the Synthesis of Cyclohexane and Cyclohexene Derivatives.

1989

Zur Struktur der Produkte der Reaktion vonE/Z-1-Benzolsulfonyl-3-(1-pentenyl)-indol mit N-Phenylmaleinimid: Ein erster Beitrag zur Konfigurations- un…

1988

The products2,3 of the reaction ofE/Z-1-benzenesulfonyl-3-(1-pentenyl)-indole (1) and N-phenylmaleimide were analysed by1H-NMR spectroscopy. Exemplarily, the structure elucidation of theendo-cyclo-adduct2 b was achieved by using several NMR techniques (diff. NOE-, INDOR-measurements, decoupling experiments, spectra simulation). The1H-NMR-spectroscopically gained prediction of relative configuration and conformation of2 b was supported on X-ray analysis. The cyclohexene ring of the new cycloadducts adopts in the liquid phase and in the crystal a slightly twisted boat conformation.

Crystal structure of 2-[chloro(4-methoxyphenyl)methyl]-2-(4-methoxyphenyl)-5,5-dimethylcyclohexane-1,3-dione

2016

One of the methyl groups and the 4-meth­oxy­phenyl substituent are in axial positions and the chloro­(4-meth­oxy­phen­yl)methyl substituent is in the equatorial position of the cyclo­hexane ring which adopts a chair conformation. The packing features inversion-symmetric dimeric units and strands along [100] and [010] established by weak C—H⋯O and C—H⋯Cl contacts.

Crystal structure and Hirshfeld surface analysis of 3-octyl-4-oxo-2,6-bis(3,4,5-trimethoxyphenyl)piperidinium chloride

2018

The title compound was synthesized by a one-pot Mannich condensation reaction. In the crystal, centrosymmetric dimers are linked into layers parallel to (011) by N—H⋯Cl and C—H⋯Cl hydrogen bonds. A Hirshfeld surface analysis indicates that O—H (20.5%) inter­actions make the largest contribution to the crystal packing.

Crystal structure and Hirshfeld surface analysis of poly[[bis[μ4-N,N′-(1,3,5-oxadiazinane-3,5-diyl)bis(carbamoylmethanoato)]nickel(II)tetrapotassium]…

2021

The complex nickel(II) anion comprises a pseudomacrocyclic hydrazide-based ligand with an L shape. In the crystal, such anions are connected with the potassium cations and the water solvent mol­ecules, forming a three-dimensional polymeric framework, which is stabilized by an extensive system of hydrogen bonds.

Crystal structure of the bis(cyclohexylammonium) succinate succinic acid salt adduct

2015

The title salt adduct comprises two cyclo­hexyl­ammonium cations, one succinate anion and one mol­ecule of succinic acid, linked together through inter­molecular hydrogen-bonding inter­actions giving a two-dimensional layer-like self-assembly lying parallel to (010).

Crystal structure of 4-(4-chlorophenyl)-6-(morpholin-4-yl)pyridazin-3(2H)-one

2015

In the crystal, pairs of centrosymmetrically related mol­ecules are linked into dimers via N—H⋯O hydrogen bonds, forming (8) ring motifs. The dimers are connected via C—H⋯O and C—H⋯Cl hydrogen bonds, forming a three-dimensional network·Semi-empirical mol­ecular orbital calculations were carried out using the AM1 method.

Crystal structure of (E)-N-(3,4-di­meth­oxy­benzyl­idene)morpholin-4-amine

2014

In the title compound, C13H18N2O3, the benzene ring makes a dihedral angle of 17.19 (11)° with the least-squares plane formed by the four C atoms of the morpholine ring, which adopts a chair conformation. In the crystal, C—H...N hydrogen bonds link the molecules into supramolecular chains running along a 21screw axis parallel to theb-axis direction. Weak C—H...π interactions are also observed.