نتایج جستجو برای: complex compound reaction mechanism
تعداد نتایج: 1738393 فیلتر نتایج به سال:
Reaction mechanism analyses performed with a 4pi detector for the systems 208Pb + Ge, 238U + Ni and 238U + Ge, combined with analyses of the associated reaction time distributions, provide us with evidence for nuclei with Z=120 and 124 living longer than 10(-18) s and arising from highly excited compound nuclei. By contrast, the neutron deficient nuclei with Z=114 possibly formed in 208Pb + Ge ...
Background: Interaction of weakly bound heavy-ions with an intermediate or heavy target is not yet understood completely due to the scarcity of experimental data. In order to develop a clear understanding of breakup fusion or preequilibrium emission even at low energy range, 3–10 MeV/nucleon, more experimental investigations are necessary. Purpose: Study of reaction mechanisms involved in the w...
The reaction of [Ru(L)2(H2biim)](ClO4)2 [L1 = 2,2¢-bipyridine (bpy) or L2 = 2-(phenylazo)pyridine (pap) and H2biim = 2,2¢-biimidazole] with Au(tht)Cl (tht = tetrahydrothiophene) in presence of base in methanol produced a terametallic cationic complex [{Ru(L)2(biim)}<s...
The dual diene/1,3-dipolar character of 1-H-imidazole 3-oxide, HIO 1, allows this compound toparticipate in a competitive Diels-Alder (DA)/1,3-dipolar cycloaddition (13DC) reaction toward C=Sdouble bond of the electro-deficient sulfonyl methane SFM 2. The B3LYP/6-311++G(d,p) calculatedrelative Gibbs free energies indicate that among the studied 13DC and DA reactions, former iscompletely preferr...
INTRODUCTION The increasing demand for diesel fuels has resulted in the use of greater percentage of cracked distillates having poor ignition properties. The ignition properties of diesel fuels can be rated in terms of their cetane number and diesel fuels having low cetane number may have poor ignition properties such as diesel knock, difficulties to start engines in the cold weather and so on....
A new synthetic strategy for the preparation of imidazo[1,2-a]pyridines 10 is reported, which is based on the electrocyclization reaction of imino pyridinium salts 7 upon treatment with a strong base. The starting materials are easily prepared from 2-aminopyridine (3) by imine condensation and subsequent alkylation at the pyridine nitrogen atom. The ring closure reaction of the zwitterionic int...
The microwave-assisted reaction of 2-nitroimidazole with 3-bromophenacyl bromide in the presence potassium carbonate as a base and dimethylformamide solvent afforded 2-(3-bromophenyl)imidazo[2,1-b]oxazole. formation this compound was explained via domino mechanism comprising an initial N-alkylation imidazole substrate, followed by base-promoted deprotonation position adjacent to carbonyl give e...
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