undecane/dichloromethane

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Energetics of oxaspirocycle prototypes: 1,7-dioxaspiro[5.5]undecane and 1,7,9-trioxadispiro[5.1.5.3]hexadecane.

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Ielogoties Reģistrēties

The relative gas-phase energetics of several low-lying isomers of 1,7-dioxaspiro[5.5]undecane and 1,7,9-trioxadispiro[5.1.5.3]hexadecane have been calculated with second-order Mller-Plesset perturbation theory and basis sets as large as aug-cc-pVQZ. Relative energies in THF, dichloromethane,

Contribution of the anomeric effect to the solution and crystal structure of [1S,2S,6S,7s]-1,6-diaza-4,9-dioxa-2,7-dimethoxycarbonylbicyclo[4.4.1]undecane, a condensation product of L-serine methyl ester with formaldehyde.

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Ielogoties Reģistrēties

The reaction of L-serine methyl ester hydrochloride (1) with paraformaldehyde (2) in dichloromethane in the presence of triethylamine afforded a novel compound: [lS,2S,6S,7S]-1,6-diaza-4,9-dioxa-2,7-dimethoxycarbonylbicyclo[4.4.1]undecane (4) as a 2:3 adduct of 1 with 2. 1H and 13C NMR spectroscopy

[Determination of organic residues in macroporous adsorption resins by gas chromatography].

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A method has been developed for the simultaneous determination of benzene, toluene, xylene, styrene, decane, diethylbenzene, undecane, divinylbenzene, dodecane and naphthalene residues in macroporous adsorption resins (MARs). The organic residues were extracted from resin samples by ultrasonic

Direct coupling of ionic liquid based single-drop microextraction and GC/MS.

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The use of ionic liquids as extracting media in single-drop liquid-phase microextraction (SDME) and its direct coupling to gas chromatography/mass spectrometry (GC/MS) is presented. For this purpose, a new removable interface that enables the introduction of the extracted analytes into the GC

Evaluation of a hypercrosslinked polystyrene, MN-200, as a sorbent for the preconcentration of volatile organic compounds in air.

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Breakthrough volumes, average percentage recoveries, and storage stabilities were obtained for vapors of 8 volatile organic compounds (pentane, octane, undecane, isooctane, cyclohexane, toluene, methanol, and dichloromethane) on a new adsorbent material, Hypersol-Macronet, MN-200. Breakthrough

[Preparation and chromatographic characteristics of linear [60] fullerene polysiloxane stationary phase for capillary gas chromatography].

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Hydrosilylation of polymethylhydrosiloxane (active hydrogen content was 0.05%) and reactions with allylbromide (or undecenyl bromide), sodium azide and [60] fullerene in their given orders is described. Two kinds of fullerene-containing polysiloxanes were obtained [polymer(3)]. Their [60] fullerene

Molecular Diversity of Compounds from Pygidial Gland Secretions of Cave-Dwelling Ground Beetles: The First Evidence.

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Ielogoties Reģistrēties

Three adult cave-dwelling ground beetle species were induced to discharge secretions of their pygidial glands into vials. Dichloromethane extraction was used to obtain the secretions. In total, 42 compounds were identified by GC/MS analysis. Pheggomisetes ninae contained 32 glandular compounds,

1-Iodo-2methylundecane, a putative estrus-specific urinary chemo-signal of female mouse (Mus musculus).

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Ielogoties Reģistrēties

The present study was designed to identify the urinary volatiles across various reproductive stages of female mice in order to detect estrus-specific chemical signal. The urine of adult female mice were extracted with dichloromethane (1:1 ratio, v/v) and analyzed by gas chromatography linked

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