Results 51 to 60 of about 388 (112)

Photoassisted Access to New Polyheterocycles [PDF]

, 2014
Photoassisted diversity-oriented synthesis holds great promise in its ability to provide rapid access to complex and diverse molecular scaffolds. As it stands, while photochemical techniques have this potential, their implementation in the field of ...
Cowger, Teresa M.
core   +1 more source

Metal-Free Multicomponent Tandem Polymerizations of Alkynes, Amines, and Formaldehyde toward Structure- and Sequence-Controlled Luminescent Polyheterocycles

, 2017
Sequence-controlled polymers, including biopolymers such as DNA, RNA, and proteins, have attracted much attention recently because of their sequence-dependent functionalities.
Zhao, Zujin, Weizhang Li, Bo Wei, Anjun Qin, Rongrong Hu, Ben Zhong Tang, Qin, Anjun, Li, Weizhang, Zujin Zhao, Hu, Rongrong, Wei, Bo, Tang, Ben Zhong   +11 more
core   +1 more source

Tandem Rh(III)-Catalyzed C–H Heteroarylation of Indolyl Ketones and Cu(II)-Promoted Intramolecular Cyclization: One-Pot Access to Blue-Emitting Phenanthrone-Type Polyheterocycles

, 2019
Disclosed herein is a highly efficient one-pot synthetic strategy to phenanthrone-type polyheterocycles via tandem rhodium­(III)-catalyzed ortho-C–H heteroarylation of indolyl ketones and copper­(II)-promoted intramolecular cyclization.
Yudong Yang (185767), Zheng Liu (28397), Mangang Zhang (6292814), Wenbo Liang (2882534), Jingsong You (1397368), Xingwen Pu (6292811), Shuyou Chen (1909381), Jingbo Lan (1452568), Min Zhang (111999)   +8 more
core   +1 more source

Rhodium catalyzed cascade cyclization featuring B-H and C-H activation: one-step construction of carborane-fused N-polyheterocycles

, 2018
A one-pot strategy for efficient and facile synthesis of C,B-substituted carborane-fused N-polyheterocycles is reported. A rhodium catalyzed cascade cyclization of carboranyl N-arylimines with vinyl ketones enables the effective construction of three new
Quan, Yangjian, Lyu, Hairong, Xie, Zuowei   +2 more
core   +1 more source

Rhodacyclopentanones as Linchpins for the Atom Economical Assembly of Diverse Polyheterocycles [PDF]

Journal of the American Chemical Society, 2020
We outline a conceptual blueprint that provides direct and atom economical access to a wide range of complex polyheterocycles. Our method capitalizes on the ambiphilic reactivity of rhodacyclopentanones that arise upon exposure of cyclopropanes to Rh(I) catalysts and CO.
Sophie Bertrand, John Bower, Tom Young   +2 more
exaly   +14 more sources

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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

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

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

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

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