Results 71 to 80 of about 5,409,859 (340)

Guanidinium 2-Carboxy-6-Nitrobenzoate Monohydrate: A Two-Dimensional Hydrogen-Bonded Network Structure [PDF]

open access: yes, 2007
In the structure of the title compound, CH6N3+ . C8H4NO6- . H2O, obtained from the reaction of guanidine carbonate with 3-nitrophthalic acid, the 2-carboxylic acid group is deprotonated and participates in an asymmetric cyclic R2/1(6) hydrogen-bonding ...
Healy, Peter   +2 more
core   +2 more sources

Sol–Gel Synthesis of Ca2.5Ag0.3Sm0.2Co4O9 Semiconducting Materials for Thermoelectric Applications in Aerospace Systems

open access: yesAdvanced Engineering Materials, EarlyView.
Ca2.5Ag0.3Sm0.2Co4O9 semiconductor materials are synthesized and produced in this study using the sol–gel and cold pressing techniques for thermoelectric generator applications. As template samples are added, the Seebeck coefficient and power factor values rise, peaking at 800 °C for Ca2.5Ag0.3Sm0.2Co4O9 at 274.47 μV K−1 and 0.58 mW mK−2, respectively.
Enes Kilinc   +4 more
wiley   +1 more source

Fragmentation of a dioxolanyl radical via nonstatistical reaction dynamics: characterization of the vinyloxy radical by ns time-resolved laser flash photolysis [PDF]

open access: yes, 2018
The photochemistry of two Barton esters, one derived from a dioxolane carboxylic acid and the other from pivalic acid, was investigated by product analysis and nanosecond laser flash photolysis (LFP).
Bucher, Götz   +3 more
core   +1 more source

Key Trends and Insights in Smart Polymeric Skin Wearable Patches

open access: yesAdvanced Engineering Materials, EarlyView.
Intelligent polymers, which respond to various physical and biological stimuli, are explored for the development of skin wearable patches in biomedical applications. Smart polymers, also known as intelligent or stimuli‐responsive polymers, play a crucial role in the development of advanced wearable patches due to their versatility and softness.
Sergio J. Peñas‐Núñez   +2 more
wiley   +1 more source

Substituted Pyrazinecarboxamides: Synthesis and Biological Evaluation

open access: yesMolecules, 2006
Condensation of the corresponding chlorides of some substituted pyrazine-2-carboxylic acids (pyrazine-2-carboxylic acid, 6-chloropyrazine-2-carboxylic acid, 5-tert-butylpyrazine-2-carboxylic acid or 5-tert-butyl-6-chloropyrazine-2-carboxylic acid ...
Katarina Kralova   +5 more
doaj   +1 more source

Thioether-catalysed tandem synthesis of furans and cyclic ethers or lactones [PDF]

open access: yes, 2017
Acyclic conjugated ynenediones tethered to an alcohol or carboxylic acid are converted into furanyl-substituted cyclic ethers or lactones in a single step by treatment with the tetrahydrothiophene.
Clark, J. Stephen, Klaus, Verena
core   +1 more source

Heterogeneous and homogeneous catalysis for the hydrogenation of carboxylic acid derivatives: history, advances and future directions.

open access: yesChemical Society Reviews, 2015
The catalytic reduction of carboxylic acid derivatives has witnessed a rapid development in recent years. These reactions, involving molecular hydrogen as the reducing agent, can be promoted by heterogeneous and homogeneous catalysts.
James Pritchard   +4 more
semanticscholar   +1 more source

The Emerging 4D Printing of Shape‐Memory Thermomorphs for Self‐Adaptative Biomedical Implants

open access: yesAdvanced Functional Materials, EarlyView.
4D printing enables the creation of smart implants that adapt to changing conditions in the human body over time. At the core of this technology are shape‐memory thermomorphs (SMTMs). This review offers an in‐depth analysis of 4D printing with SMTMs, emphasizing the latest advancements in smart materials, stimuli, programming principles, and their ...
Aixiang Ding, Fang Tang, Eben Alsberg
wiley   +1 more source

The Factors Affecting on Association of Some Carboxylic Acids Effect of Solvent, Isomerism, Conjugation Process and Steric Effect [PDF]

open access: yesمجلة التربية والعلم, 2008
The study is mainly concerned with the physical factors affecting on association of carboxylic acids such as type of solvent, isomers, conjugation and steric effect of acid.
A.S.P. Azzouz, M. M.H. Al-Niemi
doaj   +1 more source

Photochemical Electrocyclic Ring Closure and Leaving Group Expulsion from N-(9-oxothioxanthenyl)Benzothiophene Carboxamides [PDF]

open access: yes, 2013
N-(9-Oxothioxanthenyl)benzothiophene carboxamides bearing leaving groups (LG− = Cl−, PhS−, HS−, PhCH2S−) at the C-3 position of the benzothiophene ring system photochemically cyclize with nearly quantitative release of the leaving group, LG−.
Sarker, Majher I.   +3 more
core   +3 more sources

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