Results 261 to 270 of about 197,331 (314)

Thermochemistry of aqueous pyridine-3-carboxylic acid (nicotinic acid)

The Journal of Chemical Thermodynamics, 2011
Abstract The molar enthalpy of solution of solid nicotinic acid (NA) at T = 298.15 K, to give an aqueous solution of molality m = 3.748 · 10−3 mol · kg−1, was determined as Δ sol H m  = (19,927 ± 48) J · mol−1, by solution calorimetry.
Elsa M. Gonçalves, Talita S. Rego, Manuel E. Minas da Piedade   +2 more
openaire   +1 more source

Photocatalyzed Decarboxylative Thiolation of Carboxylic Acids Enabled by Fluorinated Disulfide.

Organic Letters, 2022
Thiolation of carboxylic acids using a disulfide reagent having tetrafluoropyridinyl groups is described. The light-mediated process is performed using an acridine-type photocatalyst.
M. O. Zubkov, M. Kosobokov, V. Levin, A. Dilman   +3 more
semanticscholar   +1 more source

ChemInform Abstract: HALOGENATED PYRIDINES. IV. NUCLEAR CHLORINATED PYRIDINE‐3‐CARBOXYLIC ACIDS

Chemischer Informationsdienst, 1976
AbstractDie durch Kupfersulfat/Quecksilbernitrat katalysierte HNO3‐Oxidation der halogenierten 3‐Chlormethyl‐pyridine (Ia) bzw. (Ib) führt zu den Nicotinsäuren (IIa) bzw. (IIb), die in 66 bzw. 34%iger Ausbeute auch durch Oxidation von (Ia) bzw. (Ib) mit wäßrigem KMnO4 bei 95°C zugänglich sind; weiterhin lassen sich (II) auch durch Hydrolyse der ...
FRANCIS MUTTERER, CLAUS D. WEIS
openaire   +1 more source

β- and γ-C(sp3)-H Heteroarylation of Free Carboxylic Acids: A Modular Synthetic Platform for Diverse Quaternary Carbon Centers.

Angewandte Chemie, 2022
Pd(II)-catalyzed C(sp3)-H activation of free carboxylic acids represents a significant advance from conventional cyclopalladation initiated reactions.
Guangrong Meng, Liang Hu, Martin Tomanik, jin-quan yu   +3 more
semanticscholar   +1 more source

Triflylpyridinium Enables Rapid and Scalable Controlled Reduction of Carboxylic Acids to Aldehydes using Pinacolborane.

Angewandte Chemie, 2022
Building up new and efficient method for the controlled conversion of carboxylic acids to aldehydes is important. Herein, we report a rapid, modular and scalable method for the conversion of carboxylic acids to aldehydes using pinacolborane at ambient ...
Du Chen, Liangxuan Xu, Yi Yu, Qinliang Mo, X. Qi, Chao Liu   +5 more
semanticscholar   +1 more source

Amphoteric ion-exchangers based on pyridine carboxylic acids

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1970
Amphoteric ion-exchangers have been prepared by the reaction of styrene and divinylbenzene copolymers of conventional and macroporous structure with pyridine carboxylic acids.
E. E. Ergozhin, B. A. Zhubanov, S. R. Rafikov, M. Kurmanaliev   +3 more
openaire   +1 more source

Symmetry of Pyridine Derivatives Controlled Two-Dimensional Nanostructural Diversity by Co-Assembly with Aromatic Carboxylic Acids.

Langmuir
The self-assembly behaviors of aromatic carboxylic acids are commonly investigated at the liquid/solid interfaces because of their rigid skeletons and both hydrogen-bond donors and receptors. However, self-assemblies of aromatic carboxylic acids with low
Yutuo Zheng, Songyao Zhang, Xiaoyang Zhao, Xinrui Miao, W. Deng   +4 more
semanticscholar   +1 more source

Pyridine-Based Cavitands for Acid and Carboxylate Recognition

Molecular Crystals and Liquid Crystals, 2006
The design, syntheses and binding capabilities of two novel cavitand-based receptors are described. Receptor 1, contains a cyclic array of pyridine moieties in its appendages and was synthesized in a single step from the known tetrol: refluxing tetrol with 2-bromomethyl 6-hydroxymethylpyridine under basic conditions. Receptor 2 was obtained by stirring
Nicola Edwards, Roger Helgeson, Yi-Lei Zhao, K. N. Houk   +3 more
openaire   +1 more source

Structural diversity of copper(I) alkynyl cluster-based coordination polymers utilizing bifunctional pyridine carboxylic acid ligands.

Nanoscale
The utilization of bifunctional ligands, specifically pyridine carboxylic acids, endowed with dual coordination sites, has been instrumental in the assembly of polymer materials.
Zheng Liu, Jun-Jie Fang, Zhi-Yi Wang, Yun-Peng Xie, Xing Lu   +4 more
semanticscholar   +1 more source

Separation of Pyridine Mono-Carboxylic Acids on Paper Chromatograms

Nature, 1956
CHEMICAL methods using cyanogen bromide and aromatic amines1–3 (Konig reaction) and an acid-indicator4 for the detection of pyridine carboxylic acids on paper chromatograms have been reported. But the toxic character of cyanogen bromide causes difficulty; and it has been observed that good spots with acid-indicator are often not produced, particularly ...
JIBAN K. CHAKRABARTI, AJOY K. GUHA
openaire   +1 more source