Results 131 to 140 of about 916 (181)

Regioselective Synthesis of Coumarin‐Annulated Polyheterocycles by [3,3] Sigmatropic Rearrangement

Synthetic Communications, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
K. C. Majumdar, B. Chattopadhyay
exaly   +2 more sources

Overview of Synthesis and Pharmacological Importance of Imidazole‐Based Polyheterocycles

ChemistrySelect
Abstract Imidazole, a privileged heterocyclic scaffold, is widely incorporated into clinically used drugs and natural products due to its ability to engage in hydrogen bonding, π–π stacking, and coordination with metal ions. This review provides a comprehensive overview of imidazole‐based polyheterocycles, emphasizing their synthesis ...
Pragati Kushwaha
exaly   +2 more sources

New Applications of Ninhydrin in the Synthesis of Polyheterocyclic Compounds

Russian Journal of Organic Chemistry, 2023
The review demonstrates new areas of application of ninhydrin as a universal reagent in organic synthesis for the construction of a wide range of polycyclic compounds with benzofuran, pyrroline, pyrrole, imidazole, pyrimidine, propellanic and other fragments.
A. V. Velikorodov, A. S. Zukhairaeva, E. N. Kutlalieva, E. A. Shustova, S. B. Nosachev   +4 more
openaire   +1 more source

Synthesis of polyheterocyclesviamulticomponent reactions

Organic & Biomolecular Chemistry, 2018
Polyheterocycles are one of the most desired synthetic targets due to their numerous and valuable applications in various fields.
Ilich A. Ibarra, Alejandro Islas-Jácome, Eduardo González-Zamora   +2 more
openaire   +2 more sources

Conducting Polyheterocycle Composites Based on Porous Hosts *

Journal of Electronic Materials, 1992
Conducting composites based on porous substrates (cotton fiber, non-woven polypropylene mat and porous crosslinked polystyrene) have been prepared by a two step imbibition technique. First, the substrate was imbibed with a solution of monomer (pyrrole or bithiophene) in acetonitrile, followed by partial drying.
J. S. Park, E. Ruckenstein
openaire   +1 more source

Glycolurils in the synthesis of fused polyheterocyclic compounds

Chemistry of Heterocyclic Compounds, 2017
We present a comprehensive analysis of data published over the last decade about the methods applicable to the synthesis of fused polyheterocyclic compounds on the basis of glycolurils.
Yana A. Barsegyan, Vladimir V. Baranov, Angelina N. Kravchenko   +2 more
openaire   +1 more source

Thermoplastic polyheterocycles. I: Polyalkylene‐benzoxazoles

Polymer Engineering & Science, 1994
AbstractPolyalkylenebenzoxazoles of high molecular weight (inherent viscosity values from 0.76 to 2.95) were prepared from 4,6‐diaminoresorcinol dihydrochloride and aliphatic diacids in polyphosphoric acid by heating at 180 to 200°C for 3–5 h. Melting points of the polymers ranged from 148 to 423°C, depending on the length of the alkylene chain.
J. Preston, Y. Tropsha, J. W. Trexler
openaire   +1 more source

CHAPTER 14. Alternating Polyheterocycles

2013
A series of π-conjugated alternating polymers containing heterocycles are reviewed in this chapter. Heteroles (heterocyclopentadienes) with boron, silicon, germanium, phosphorus, and transition metals are the main focus. In the former part, the characteristics and applications of these polymers are explained, focusing on the optical and electronic ...
Kazuo Tanaka, Yoshiki Chujo
openaire   +1 more source

Novel alicyclic dianhydrides and polyheterocycles on their basis

Makromolekulare Chemie. Macromolecular Symposia, 1991
AbstractDianhydrides of alicyclic tetracarboxylic acids were synthesized by chemical modification of tri‐cyclodecenetetracarboxylic dianhydride and its chloro‐containing derivatives. By polycondensation of these di‐anhydrides with diamines polyimides were obtained. Thermal and thermooxidative degradation of these polyimides are discussed.
B. A. Zhubanov, N.Y U. Shpilman, O. A. Almabekov, V. A. Solomin, K. O. Kozybaev   +4 more
openaire   +1 more source

Stability studies of electrically conducting polyheterocycles

Synthetic Metals, 1991
Abstract The stability of the electrical conductivity of two types of polyheterocycles, the poly(3-alkylthiophenes) and polypyrrole, was examined under systematically controlled environmental and thermal conditions. The conductivity stability of the polypyrroles was found to be significantly better than that of the poly(3-alkylthiophenes ...
Yading Wang, M.F. Rubner, L.J. Buckley
openaire   +1 more source