scholarly journals (E)-3-((2-Fluorophenyl)(hydroxy)methylene)imidazo[1,2-a]pyri-din-2(3H)-one

Molbank ◽  
10.3390/m1212 ◽  
2021 ◽  
Vol 2021 (2) ◽  
pp. M1212
Author(s):  
Giammarco Tenti ◽  
Ángel Cores ◽  
María Teresa Ramos ◽  
J. Carlos Menéndez
Keyword(s):  
Heterocyclic System ◽  
Acyl Substituent ◽  
Single Operation

Treatment of a N-2-pyridyl-β-ketoamide precursor with bromine afforded the first example of the 3-aryl(α-hydroxy)methylenelimidazo[1,2-a]pyridin-2(3H)-one framework. This transformation proceeded through a domino process comprising an initial bromination, cyclization via an intramolecular SN reaction, and a final keto-enol tautomerism, and allows generation of the fused heterocyclic system and installation of the acyl substituent in a single operation.

scholarly journals Electrochemically Produced Copolymers of Pyrrole and Its Derivatives: A Plentitude of Material Properties Using “Simple” Heterocyclic Co-Monomers

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 281
Author(s):  
Tomasz Jarosz ◽  
Przemyslaw Ledwon
Keyword(s):  
Biological Activity ◽  
Material Properties ◽  
Building Block ◽  
Conjugated Polymer ◽  
Chemical Structure ◽  
Heterocyclic System ◽  
Repeat Unit ◽  
Polymeric Materials ◽  
Pyrrole Derivatives ◽  
Pyrrole Monomer

Polypyrrole is a classical, well-known conjugated polymer that is produced from a simple heterocyclic system. Numerous pyrrole derivatives exhibit biological activity, and the repeat unit is a common building block present in the chemical structure of many polymeric materials, finding wide application, primarily in optoelectronics and sensing. In this work, we focus on the variety of copolymers and their material properties that can be produced electrochemically, even though all these systems are obtained from mixtures of the “simple” pyrrole monomer and its derivatives with different conjugated and non-conjugated species.

scholarly journals 7-Bromo-[1,2,5]selenadiazolo[3,4-d]pyridazin-4(5H)-one

Molbank ◽  
10.3390/m1229 ◽  
2021 ◽  
Vol 2021 (2) ◽  
pp. M1229
Author(s):  
Timofey N. Chmovzh ◽  
Oleg A. Rakitin
Keyword(s):  
Mass Spectrometry ◽  
Heterocyclic System ◽  
High Resolution Mass Spectrometry ◽  
Uv Spectroscopy ◽  
Hydrolysis Product ◽  
Selenium Dioxide ◽  
Biologically Active ◽  
Photovoltaic Materials ◽  
Organic Photovoltaic Materials ◽  
Ir And Uv Spectroscopy

New heterocyclic systems containing 1,2,5-chalcogenadiazoles are of great interest for the creation of organic photovoltaic materials and biologically active compounds. In this communication, 3,6-dibromopyridazine-4,5-diamine was investigated in reaction with selenium dioxide in order to obtain 4,7-dibromo-[1,2,5]selenadiazolo[3,4-d]pyridazine. We found that 7-bromo-[1,2,5]selenadiazolo[3,4-d]pyridazin-4(5H)-one, the first representative of the new heterocyclic system, was isolated as a hydrolysis product of the corresponding 4,7-dibromoderivative. The structure of the newly synthesized compound was established by means of elemental analysis, high-resolution mass spectrometry, 1H, 13C NMR, IR and UV spectroscopy, and mass spectrometry.

Benzo[b]phosphole and Derivatives

1971 ◽  
Vol 49 (3) ◽  
pp. 530-531 ◽  
Author(s):  
T. H. Chan ◽  
L. T. L. Wong
Keyword(s):  
Heterocyclic System ◽  
General Synthesis

A potentially general synthesis of 1-heteroindene has been developed and applied to the preparation of l-phenylbenzo[b]phosphole, a novel heterocyclic system.

ChemInform Abstract: 4,6-Dihydrofuro[3,4-d]imidazole: A New Heterocyclic System.

ChemInform ◽  
2010 ◽  
Vol 32 (30) ◽  
pp. no-no
Author(s):  
Yu. E. Ivanov ◽  
A. A. Yavolovskii ◽  
R. Yu. Ivanova
Keyword(s):  
Heterocyclic System

Single operation earliness—tardiness scheduling with machine activation costs

2002 ◽  
Vol 34 (5) ◽  
pp. 509-513 ◽  
Author(s):  
SHRIKANT S. PANWALKAR ◽  
SURYA D. LIMAN
Keyword(s):  
Single Operation
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