نتایج جستجو برای: cyclic hydrocarbons

تعداد نتایج: 124668  

Journal: :Nature Communications 2021

Abstract Sulfinyl radicals – one of the fundamental classes S-centered have eluded synthetic application in organic chemistry for over 60 years, despite their potential to assemble valuable sulfoxide compounds. Here we report successful generation and use sulfinyl a dual radical addition/radical coupling with unsaturated hydrocarbons, where readily-accessed sulfones serve as precursor. The stra...

2005
G. P. Karwasz D. Pliszka R. S. Brusa C. Perazzolli

We report total cross-section measurements for positron scattering on cyclic hydrocarbons: benzene, aniline, and cyclohexane. Measurements were done by an absolute transition method in the energy range 1.5–20 eV (0.4–20 eV for cyclohexane). High cross-sections for all measured molecules were observed at low energies. In the case of cyclohexane the cross-section in the zero energy limit tends to...

Journal: : 2021

Objectives. The increased use of unmanned aerial vehicles necessitates the search for jet fuels based on hydrocarbon materials with high energy intensity and physical density. purpose work was to analyze influence various factors mass hydrocarbons. This analysis is required substantiate algorithm locating energy-intensive CnHm structures. Methods. Combustion calculated using additive procedures...

Journal: :Chemical communications 2013
Hussein H Mustafa Mark S Baird Juma'a R Al Dulayymi Viacheslav V Tverezovskiy

Both diastereomers of the tris-allene, cyclododeca-1,2,5,6,9,10-hexaene have been obtained using a triple cyclopropylidene-allene rearrangement. On the NMR timescale, one has D3 symmetry, and is the smallest hydrocarbon synthesised to have this symmetry, and the second has C2 symmetry.

Journal: :The Annals of occupational hygiene 2004
Tim Meijster Igor Burstyn Berna Van Wendel De Joode Maarten A Posthumus Hans Kromhout

The goal of this study was to monitor emission of chemicals at a factory where plastics products were fabricated by a new robotic (impregnated tape winding) production process. Stationary and personal air measurements were taken to determine which chemicals were released and at what concentrations. Principal component analyses (PCA) and linear regression were used to determine the emission sour...

Journal: :Nanoscale 2015
Haridas Kar Dominik W Gehrig Frédéric Laquai Suhrit Ghosh

Herein we reveal a straightforward supramolecular design for the H-bonding driven J-aggregation of an amine-substituted cNDI in aliphatic hydrocarbons. Transient absorption spectroscopy reveals sub-ps intramolecular electron transfer in isolated NDI molecules in a THF solution followed by a fast recombination process, while a remarkable extension of the excited state lifetime by more than one o...

Journal: :Journal of chromatographic science 2001
D Cam S Gagni

Manual solid-phase microextraction (SPME) coupled with gas chromatography-mass spectrometry is investigated as a possible alternative for the determination of petroleum hydrocarbons in soils. Spiked onto an agricultural soil is a commercial diesel fuel (DF) with the following composition by weight: 12% linear alkanes, 52% saturated hydrocarbons (branched and cyclic), 21% alkylated aromatic hydr...

2014
J Richard Premkumar Deivasigamani Umadevi

In this study, the interaction pattern and energies of a series of hydrocarbon dimers have been investigated by using a highly reliable quantum chemical method (M06-2X/cc-pVTZ). Saturated and unsaturated hydrocarbons in both cyclic and acyclic forms have been modelled to study their interaction. These dimers are found to involve different types of noncovalent interactions such as π-π (dimer of ...

2015
Haridas Kar Dominik W. Gehrig Frédéric Laquai

Herein we reveal a straightforward supramolecular design for the H-bonding driven J-aggregation of an amine-substituted cNDI in aliphatic hydrocarbons. Transient absorption spectroscopy reveals sub-ps intramolecular electron transfer in isolated NDI molecules in a THF solution followed by a fast recombination process, while a remarkable extension of the excited state lifetime by more than one o...

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