Adsorption Reactions of Carboxylic Acid Functional Groups on Sodium Aluminoborosilicate Glass Fiber Surfaces

2010 ◽  
Vol 2 (11) ◽  
pp. 3303-3309 ◽  
Author(s):  
Joshua J. Stapleton ◽  
Daniel L. Suchy ◽  
Joy Banerjee ◽  
Karl T. Mueller ◽  
Carlo G. Pantano
Keyword(s):  
Carboxylic Acid ◽  
Glass Fiber ◽  
Functional Groups ◽  
Aluminoborosilicate Glass

scholarly journals Development of variously functionalized nitrile oxides

2015 ◽  
Vol 11 ◽  
pp. 1241-1245 ◽  
Author(s):  
Haruyasu Asahara ◽  
Keita Arikiyo ◽  
Nagatoshi Nishiwaki
Keyword(s):  
Carboxylic Acid ◽  
Nucleophilic Substitution ◽  
Functional Groups ◽  
Grignard Reagent ◽  
Cycloaddition Reaction ◽  
Chemical Transformations ◽  
Nitrile Oxides ◽  
Weinreb Amide ◽  
Isoxazole Derivatives ◽  
Acid Esters

N-Methylated amides (N,4-dimethylbenzamide and N-methylcyclohexanecarboxamide) were systematically subjected to chemical transformations, namely, N-tosylation followed by nucleophilic substitution. The amide function was converted to the corresponding carboxylic acid, esters, amides, aldehyde, and ketone upon treatment with hydroxide, alkoxide, amine, diisobutylaluminium hydride and Grignard reagent, respectively. In these transformations, N-methyl-N-tosylcarboxamides behave like a Weinreb amide. Similarly, N-methyl-5-phenylisoxazole-3-carboxamide was converted into 3-functionalized isoxazole derivatives. Since the amide was prepared by the cycloaddition reaction of ethynylbenzene and N-methylcarbamoylnitrile oxide, the nitrile oxide served as the equivalent of the nitrile oxides bearing a variety of functional groups such as carboxy, alkoxycarbonyl, carbamoyl, acyl and formyl moieties.

Research on Properties of CNF/Glass Fiber/Epoxy Composites

2014 ◽  
Vol 513-517 ◽  
pp. 161-164
Author(s):  
Xing Kai Chen
Keyword(s):  
Infrared Spectrum ◽  
Glass Fiber ◽  
Functional Groups ◽  
Carbon Nanofibers ◽  
Epoxy Matrix ◽  
Tensile Modulus ◽  
Epoxy Composites ◽  
Reinforcement Efficiency

In the present investigation, carbon nanofibers (CNF) were dispersed in epoxy matrix to form CNF/glass fiber/epoxy composites. Before blending, CNF was oxidated to get more functional groups on CNF and improve the interface combination between resin and CNF, the infrared spectrum was used to test the efficiency. After that, tensile modulus tests were carried on for CNF/glass fiber/epoxy composites with different CNF fractions, the results indicated that there were slight improvements of tensile modulus when adding CNF. At 3.0 wt% of CNF, composites have the high improvement of tensile modulus, but the reinforcement of CNF decreased at 5.0 wt% of CNF. And the CNF reinforcement efficiency was analyzed using modified Coxs model and rule of mixture.

scholarly journals Concomitant polymorphs of aryl-ether amine via catemer and dimer carboxylic acid supramolecular interactions and their effect on optical properties

2021 ◽  
Author(s):  
Mehboobali Pannipara ◽  
Abdullah G Al-Sehemi
Keyword(s):  
Optical Properties ◽  
Carboxylic Acid ◽  
Crystal Lattice ◽  
Functional Groups ◽  
Molecular Orbital ◽  
Acid Group ◽  
Supramolecular Interactions ◽  
Aryl Ether ◽  
Stability Calculation ◽  
The Stability

Abstract Carboxylic acid supramolecular synthon exhibited dimer or catemer motifs in the crystal lattice depend on the substituent and other functional groups present in the structure. In general, presence of other competing functional groups produced catemer motifs whereas unsubstituted acids showed dimer. In this manuscript, we have synthesized a new aryl ether amine-based Schiff base with carboxylic acid functionality ( 1 ) and demonstrated polymorphic structure via catemer ( 1a ) and dimer ( 1b ) motifs in the solid state. In both the structure, carboxylic acid group adopted different orientation in the crystal lattice. The different H-bonding lead to modulation of optical properties that was further supported highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) calculation. Further the stability calculation indicates that catemer structure was more stable by 8.54 kcal/mole relative to dimer motifs. In contrast, naphthyl group attached carboxylic acid structure did not show neither dimer nor catemer motifs in the crystal lattice as compared to diethylaminophenyl group, which confirm the presence of other substituent or competing functional groups strongly influence on the motifs of supramolecular interactions.

BSA-modified poly(pyrrole-3-carboxylic acid) nanoparticles as carriers for combined chemo-photothermal therapy

2018 ◽  
Vol 6 (47) ◽  
pp. 7877-7888 ◽  
Author(s):  
Xuexin Bi ◽  
Huiling Su ◽  
Wei Shi ◽  
Xin Liu ◽  
Zi He ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Functional Groups ◽  
Infrared Absorption ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Reverse Microemulsion ◽  
Microemulsion Method ◽  
Reverse Microemulsion Method

Homogenous poly(pyrrole-3-carboxylic acid) nanoparticles with high near-infrared absorption and abundant functional groups were fabricated using a facile reverse microemulsion method.

Solvent- and catalyst-free, quantitative protection of hydroxyl, thiol, carboxylic acid, amide and heterocyclic amino functional groups

2016 ◽  
Vol 18 (23) ◽  
pp. 6209-6214 ◽  
Author(s):  
Mia L. Jawor ◽  
Basil M. Ahmed ◽  
Gellert Mezei
Keyword(s):  
Carboxylic Acid ◽  
Functional Groups ◽  
Acid Amide ◽  
Waste Materials ◽  
Carboxylic Acid Amide ◽  
Catalyst Free

Various substrates are quantitatively protected by 3,4-dihydro-2H-pyran at 125 °C in the absence of any additional chemicals, without generating any waste materials.

scholarly journals Stereoselective Palladium-Catalyzed C(sp3)–H Mono-Arylation of Piperidines and Tetrahydropyrans with a C(4) Directing Group

2021 ◽  
Author(s):  
Amalia-Sofia Piticari ◽  
Daniele Antermite ◽  
Joe I. Higham ◽  
J. Harry Moore ◽  
Matthew P. Webster ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Functional Groups ◽  
One Pot ◽  
Palladium Catalyzed ◽  
Directing Group

A selective Pd-catalyzed C(3)–H cis-functionalization of piperidine and tetrahydropyran carboxylic acids is achieved using a C(4) aminoquinoline amide auxiliary. High mono- and cis-selectivity is attained by using mesityl carboxylic acid as an additive. Conditions are developed with significantly lower reaction temperatures (≤50 °C) than other reported heterocycle C(sp3)–H functionalization reactions, which is facilitated by a DoE optimization. A one-pot C–H functionalization-epimerization procedure provides the trans-3,4-disubstituted isomers directly. Divergent aminoquinoline removal is accomplished with the installation of carboxylic acid, alcohol, amide and nitrile functional groups. Overall fragment compounds suitable for screening are generated in 3–4 steps from readily-available heterocyclic carboxylic acids.

Seven hexamethylenetetramine (HMTA) complexes with mono- and dicarboxylic acids: analysis of packing modes of HMTA complexes in the literature

2011 ◽  
Vol 67 (2) ◽  
pp. 177-192 ◽  
Author(s):  
Andreas Lemmerer
Keyword(s):  
Carboxylic Acid ◽  
Functional Groups ◽  
Weak Interactions ◽  
Dicarboxylic Acids ◽  
Building Blocks ◽  
Strong Interactions ◽  
Two Dimensional ◽  
Nitrobenzoic Acid ◽  
Weak Hydrogen Bonds ◽  
Assembly Features

The crystal structures of seven hexamethylenetetramine (HMTA) complexes, or co-crystals, with carboxylic acid donor molecules are reported to explain the link between the molecular structure of HMTA and the crystal structure of the co-crystals, i.e. the dimension and shape of their hydrogen-bonded assembly. A comprehensive and detailed literature survey of HMTA complexes (38), be they neutral co-crystals or salts, with molecules containing carboxylic acid and phenol functional groups reveals that in general two N acceptors are used for strong O—H...N interactions. Owing to the relative arrangement of two of the four N atoms, the most common type of assembly features one-dimensional zigzag chains. Weak interactions of the C—H...N type are formed by N atoms not involved in strong interactions. These chains also form the basis of two-dimensional assemblies. These one- and two-dimensional assemblies feature either two or three functional groups. If only one functional group is on the donor molecule, then wing or V-shaped zero-dimensional assemblies are formed, which can be considered to be the building blocks for one- and two-dimensional assemblies. In general, the HMTA molecules form two-dimensional layers which are stabilized by weak hydrogen bonds. Co-crystals with cyclohexylcarboxylic acid (I), 4-fluorobenzoic acid (II), 4-methylbenzoic acid (III) and cinnamic acid (IV) all feature the V-shaped zero-dimensional assemblies. Co-crystals with cis-1,4-cyclohexyldicarboxylic acid (VI) and trans-1,4-cyclohexylcarboxylic acid (VII) feature the zigzag chains and can be structurally derived from co-crystal (I). Co-crystal (V), with 4-nitrobenzoic acid, has solvent water included and features hydrogen bonding to all four N atoms of the HMTA molecule.

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