Chemical effects of nuclear transformations and possible formation of unknown derivatives with N-phenylquinazolinium structure

2020 ◽  
Vol 108 (2) ◽  
pp. 105-111
Author(s):  
Nadezhda E. Shchepina ◽  
Viktor V. Avrorin ◽  
Gennadii A. Badun ◽  
Sergey N. Shurov ◽  
Roman V. Shchepin
Keyword(s):  
Nitrogen Atom ◽  
Chemical Synthesis ◽  
Chemical Method ◽  
Β Decay ◽  
Chemical Effects ◽  
Quinazoline Derivatives ◽  
Therapeutic Activities

AbstractQuinazoline derivatives are well known to have a diverse array of therapeutic activities. Unfortunately, “classic” chemical synthesis does not provide an opportunity for the formation of N-phenyl quaternary 1,3-diazinium compounds. A devised nuclear-chemical method of synthesis based on chemical effects of nuclear transformations enables a new way of the direct nitrogen atom phenylation by the nucleogenic (generated by tritium β-decay) phenyl cations in 1,3-diazines, furnishing, based on our prediction, formation of previously unknown derivatives with N-phenyl quaternary quinazolinium scaffold.

Chemical effects of β-decay in95Zr-Alizarin S and95Zr-TTA complexes

1988 ◽  
Vol 125 (2) ◽  
pp. 473-480 ◽  
Author(s):  
A. M. Nicolás ◽  
A. Trifone ◽  
S. J. Nassiff
Keyword(s):  
Β Decay ◽  
Chemical Effects

scholarly journals Chemical synthesis of nanopowder Nd2Fe14BаSiO2 of the nucleus-shell type

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 14-16
Author(s):  
O. E. Abdurakhmonov ◽  
◽  
D. A. Vertaeva ◽  
E. V. Yurtov ◽  
◽  
...  
Keyword(s):  
Particle Size ◽  
Chemical Synthesis ◽  
Chemical Method ◽  
Silica Coating ◽  
Alloy Nanoparticles ◽  
The Core ◽  
Shell Width ◽  
Sio2 Shell ◽  
Co Precipitation ◽  
Precipitation Reduction

Nanoparticles of the alloy with the composition Nd-Fe-B were formed by the chemical method of co-precipitation reduction using a reducing agent sodium borohydride. The nanoparticle size was 35–95 nm. The silica coating was applied after stabilizing the nanoparticles with APTMS. The core of Nd-Fe-B alloy nanoparticles covered with a SiO2 shell, Nd2Fe14BаSiO2, the particle size was 35–125 nm with a shell width of 8–15 nm.

scholarly journals An Overview of Bioactive 1,3-Oxazole-Containing Alkaloids from Marine Organisms

2021 ◽  
Vol 14 (12) ◽  
pp. 1274
Author(s):  
Jinyun Chen ◽  
Sunyan Lv ◽  
Jia Liu ◽  
Yanlei Yu ◽  
Hong Wang ◽  
...  
Keyword(s):  
Nitrogen Atom ◽  
Chemical Synthesis ◽  
Biological Activities ◽  
Structural Features ◽  
Biological Properties ◽  
Therapeutic Agents ◽  
Marine Organisms ◽  
Chemical Structures ◽  
First Time ◽  
Oxazole Derivatives

1,3-Oxazole chemicals are a unique class of five-membered monocyclic heteroarenes, containing a nitrogen atom and an oxygen. These alkaloids have attracted extensive attention from medicinal chemists and pharmacologists owing to their diverse arrays of chemical structures and biological activities, and a series of 1,3-oxazole derivatives has been developed into therapeutic agents (e.g., almoxatone, befloxatone, cabotegravir, delpazolid, fenpipalone, haloxazolam, inavolisib). A growing amount of evidence indicates that marine organisms are one of important sources of 1,3-oxazole-containing alkaloids. To improve our knowledge regarding these marine-derived substances, as many as 285 compounds are summarized in this review, which, for the first time, highlights their sources, structural features and biological properties, as well as their biosynthesis and chemical synthesis. Perspective for the future discovery of new 1,3-oxazole compounds from marine organisms is also provided.

Chemical synthesis versus green synthesis to obtain ZnO powders: evaluation of the antibacterial capacity of the nanoparticles obtained by the chemical method

2021 ◽  
pp. 106544
Author(s):  
Maria I. Benitez-Salazar ◽  
Victoria E. Niño-Castaño ◽  
Rosa A. Dueñas-Cuellar ◽  
Liliana Caldas-Arias ◽  
Ingrid Fernández ◽  
...  
Keyword(s):  
Chemical Synthesis ◽  
Green Synthesis ◽  
Chemical Method ◽  
Zno Powders ◽  
Antibacterial Capacity

Chemical effects of β-decay from 132Te to TO 132I

1961 ◽  
Vol 21 (3-4) ◽  
pp. 205-209 ◽  
Author(s):  
C. Cummiskey ◽  
S.M. Hamill ◽  
W.H. Hamill ◽  
R.R. Williams
Keyword(s):  
Β Decay ◽  
Chemical Effects

Atomic effects on β-decay

1988 ◽  
Vol 420 (1859) ◽  
pp. 277-321 ◽  
Keyword(s):  
Half Life ◽  
Electronic Configuration ◽  
Bound State ◽  
The Other ◽  
Initial State ◽  
Β Decay ◽  
Point Energy ◽  
Chemical Effects ◽  
Chemically Induced ◽  
Induced Changes

Factors leading to the dependence of the β-decay half-life on the atomic electron environment are discussed. An expression for the rate of allowed β-decay of a nucleus embedded in a multielectron atom having an arbitrary electronic configuration is derived. This is then used to obtain a new expression for the ratio of decay constants for bound and continuum decays from a general electron state. This expression fully incorporates exchange of the β-electron with the other bound electrons. It also includes the inhibition of the decay rate, which originates from the total or partial occupation of orbitals by electrons in the initial state. Specific expressions are presented for bound-state decay of an initial-state atomic system having open or closed s-shell configurations. The magnitudes of chemical effects on low-energy β-decays are demonstrated by calculations on 106 Ru. This isotope appears to represent a particularly favourable case for experimental study of chemical effects. Two main chemical effects are found. One arises from the change in bound-state decays, which, although they constitute a small fraction (less than 1%) of total decays, are very sensitive to chemical effects. The other factor arises from the effect on continuum decays of chemically induced changes in the end-point energy. For 106 Ru both effects lead to changes of order 0.1% in the total decay half-life when the ionicity is changed by one unit. However, both effects tend to partially cancel one another, with the result that the net difference in half-life is in the range 0.01–0.1%.

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