Results 271 to 280 of about 105,049 (336)

A new synthesis of pyrroles

Chem. Commun., 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Quiclet-Sire, Béatrice, Wendeborn, Frédérique, Zard, Samir, Z.   +2 more
openaire   +3 more sources

Photocatalytic furan-to-pyrrole conversion

Science
The identity of a heteroatom within an aromatic ring influences the chemical properties of that heterocyclic compound. Systematically evaluating the effect of a single atom, however, poses synthetic challenges, primarily as a result of thermodynamic ...
Donghyeon Kim, Jaehyun You, D. Lee, H. Hong, Dongwook Kim, Yoon-Bong Park   +5 more
semanticscholar   +1 more source

Transition Metal‐Catalyzed and Metal‐Free Cyclization Reactions of Alkynes with Nitrogen‐Containing Substrates: Synthesis of Pyrrole Derivatives

, 2020
This review describes the efforts in the synthesis of pyrrole derivatives using the reaction of alkynes with nitrogen‐compounds under transition metal‐catalyzed and metal‐free conditions, in the past decade.
José S. S. Neto, G. Zeni
semanticscholar   +1 more source

Enhancement of the thermoelectric property of nanostructured polyaniline/carbon nanotube composites by introducing pyrrole unit onto polyaniline backbone via a sustainable method

Chemical Engineering Journal, 2019
The electrical conductivity of conducting polymer depends strongly on the alignment of the polymer chains, and a fully aligned polymer backbone strongly enhances the conjugation.
Shichao Wang, Fuwei Liu, Chunmei Gao, Tao Wan, Lu-Hai Wang, Li Wang, Lei Wang   +6 more
semanticscholar   +1 more source

The System Pyridine-Pyrrole and the Association of Pyrrole

The Journal of Chemical Physics, 1955
Pyridine and pyrrole react together to form a 1:1 complex as shown by infrared, heat of reaction, viscosity, refractive index, and density data. The heat of formation of this complex is 3.8 kcal/mole. Pyrrole itself is associated, but, like the simple alcohols, cannot be represented by a simple equilibrium.
Serge N. Vinogradov, Robert H. Linnell
openaire   +1 more source

Pyrrole-Hemoglobin Adducts, a More Feasible Potential Biomarker of Pyrrolizidine Alkaloid Exposure.

Chemical Research in Toxicology, 2019
Pyrrolizidine alkaloids (PAs) are naturally occurring phytotoxins widely distributed in about 3% of flowering plants. The formation of PA-derived pyrrole-protein adducts is considered as a primary trigger initiating PA-induced hepatotoxicity. The present
Jiang Ma, Jian-Qing Ruan, Xin-Meng Chen, Dong-ping Li, Sheng Yao, Peter P. Fu, Yang Ye, Hong Gao, Ji-Yao Wang, G. Lin   +9 more
semanticscholar   +1 more source

The Hantzsch Pyrrole Synthesis: Non-conventional Variations and Applications of a Neglected Classical Reaction

Synthesis, 2018
Pyrrole is one of the most important one-ring heterocycles because of its widespread presence in natural products and unnatural bioactive compounds and drugs in clinical use.
M. Leonardi, Verónica Estévez, M. Villacampa, J. Menéndez   +3 more
semanticscholar   +1 more source

The Dual-State Luminescent Mechanism of 2,3,4,5-Tetraphenyl-1H-pyrrole.

Chemistry, 2018
2,3,4,5-Tetraphenyl-1H-pyrrole (TePP) was synthesized by a simple one-step reaction. The compound showed a balanced emission in both the solution and solid state with the absolute quantum yield of ΦF/THF =65.6 % and ΦF/solid =74.3 %, respectively ...
Yun-Xiang Lei, Qian-Wei Liu, Li-Chao Dong, Zhengxu Cai, Jian-Bing Shi, Jun-Ge Zhi, B. Tong, Yu-Ping Dong   +7 more
semanticscholar   +1 more source

The Synthesis of 3-Substituted Pyrroles from Pyrrole

Synthesis, 1985
La reaction d'electrophiles avec le pyrrole se fait preferentiellement en position 1 ou 2; pour obtenir des derives substitues en 3, on protege d'abord la position 1 ou 2 par des substituants orientant la reaction en position 3 ou on utilise en position 2 des substituants permettant un rearrangement conduisant aux pyrroles substituees en 3; une etape ...
Hugh J. Anderson, Charles E. Loader
openaire   +1 more source

Oxidative Copolymerization of Pyrrole and N-Methyl Pyrrole

International Journal of Polymer Analysis and Characterization, 2003
Pyrrole and N-methyl pyrrole were copolymerized by ceric ammonium nitrate (CAN) in aqueous solution.
Belkis Ustamehmetoğlu, Eda Kelleboz, A. Sezai Sara¸   +2 more
openaire   +1 more source