Results 81 to 90 of about 17,511 (250)

COMPLEX COMPOUNDS OF BIPOSITIVE SILVER WITH PYRIDINE CARBOXYLIC ACIDS. PART III. ARGENTIC COMPOUNDS OF PYRIDINE TRICARBOXYLIC ACIDS

, 1957
In continuation of the previous work on silver(II) complexes of pyridine mono- and dicarboxylic acids it has now been possible to prepare the argentic complexes of some of the pyridine tricarboxylic acids, namely pyridine-2 :3:6-, -2:4:5, and -2 :4 :6-carboxylic acids. Argentic complexes of all the three acids were obtained by the persulphate oxidation
BIRESWAR BANERJEE, PRIYADARANJAN RAY
openaire   +2 more sources

Oxidation of 3- and 4-Methylpyridines on Vanadium-Anatase and Vanadium-Rutile Catalysts

Eurasian Chemico-Technological Journal, 2012
Heterogeneous catalytic vapor-phase oxidation of methylpyridines is "green", the most simple and perspective method for obtaining pyridinecarboxylic acids.
O. K. Yugay, T. P. Mikhailovskaya, D. Kh. Sembaev, P. B. Vorobyev   +3 more
doaj   +1 more source

An Efficient Green Approach for the Synthesis of Fluoroquinolones Using Nano Zirconia Sulfuric Acid as Highly Efficient Recyclable Catalyst in two Forms of Water [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2018
Various antibacterial fluoroquinolone compounds were prepared by the direct amination of 7-halo-6- fluoroquinolone-3-carboxylic acids with a variety of piperazine derivatives and (4aR,7aR)-octahydro-1H-pyrrolo[3,4-b] pyridine using Zirconia Sulfuric Acid
Ahmad Nakhaei, Abolghasem Davoodnia, Sepideh Yadegarian   +2 more
doaj  

Infrared Spectra of Pyrazine-and Pyridine-carboxylic Acid and Their Derivatives.

Chemical and Pharmaceutical Bulletin, 1959
Infrared absorption spectra of pyridine- and pyrazine-carboxylic acids have following characteristic absorptions. 1) There are broad absorption bands with peaks at 2450 and 1900 cm-1. The former shifts to around 1900 cm-1 by deuteration but the latter does not. 2) Absorptions for O-H in-plane deformation and C-O stretching vibration are present at 1340∼
Yoshida, Shigeru, Asai, Motoji
openaire   +2 more sources

Synthesis of Functionalized Azobiphenyl‐ and Azoterphenyl‐ Ditopic Linkers: Modular Building Blocks for Photoresponsive Smart Materials

ChemistryOpen, 2019
Modular synthesis of structurally diverse functionalized azobiphenyls and azoterphenyls for the realization of optically switchable materials has been described.
Dr. Sylvain Grosjean, Patrick Hodapp, Dr. Zahid Hassan, Prof. Dr. Christof Wöll, Dr. Martin Nieger, Prof. Dr. Stefan Bräse   +5 more
doaj   +1 more source

PERFIL VOLÁTIL DO Coffea arabica E Coffea canephora var. conilon POR SHS-GC-MS E QUIMIOMETRIA [PDF]

Química Nova
The volatile composition of coffee exerts a substantial influence on its quality, as it defines the characteristics of the beverage. However, these compounds are influenced by factors within the coffee production chain, such as botanical origin ...
Marcos Valério Vieira Lyrio, Pedro Henrique Pereira da Cunha, Danieli Grancieri Debona, Bárbara Zani Agnoletti, Roberta Quintino Frinhani, Emanuele Catarina da Silva Oliveira, Paulo Roberto Filgueiras, Lucas Louzada Pereira, Eustáquio Vinicius Ribeiro de Castro   +8 more
doaj   +1 more source

Late‐Stage Functionalization of Peptides on the Solid Phase

Angewandte Chemie International Edition, EarlyView.
Peptide modifications are essential to control pharmacodynamic and pharmacokinetic properties of peptide drugs. Consequently, strategies that allow for efficient and rapid incorporation of non‐canonical modifications into peptides in parallel formats are highly sought after.
Marius Werner, Truc Lam Pham, Franziska Thomas   +2 more
wiley   +1 more source

Perspectives on Synthetic Adducts (Salts) of Nitroxoline^TM and 2-Aminoquinolin-8-ol as Promising Antibacterial Agents

Chemistry Proceedings
The threatening phenomenon of antibiotic failure in the future determines the intensive research of antibacterial active compounds, which are promising candidates as antibiotics.
Tibor Maliar, Renata Gašparová, Mária Maliarová   +2 more
doaj   +1 more source

Spatial Evolution of Coke in ZSM‐5 Catalysts During Methanol‐to‐Hydrocarbons Conversion Revealed by In Situ X‐Ray Photoelectron Spectroscopy

Angewandte Chemie International Edition, EarlyView.
Coking is the central source of deactivation of zeolite catalysts. Using in situ XPS along with complementary methods, we identify differences in the formation kinetics and composition of surface coke on industrially relevant ZSM‐5 catalysts during MTH conversion, demonstrating the strong potential of this technique for studying catalyst deactivation ...
Luca Artiglia, Hannes Frey, Loïc Bénariac‐Doumal, Sung Sik Lee, Przemyslaw Rzepka, Jeroen A. van Bokhoven, Vladimir Paunović   +6 more
wiley   +1 more source

Synthesis of S- and N,S-Heterocycle–Dipeptide Conjugates for Supramolecular Hydrogel Formation

Molecules
Small peptides with aromatic nuclei at the N-terminus have been shown to form bioactive, biocompatible, and biodegradable supramolecular peptide hydrogels.
Ana-Morgana G. P. Silva, Maria F. Martins, Carlos B. P. Oliveira, José A. Martins, Paula M. T. Ferreira, Maria-João R. P. Queiroz   +5 more
doaj   +1 more source