Search results for "Capsule"

showing 3 items of 223 documents

The Hexameric Resorcinarene Capsule as a Brønsted Acid Catalyst for the Synthesis of Bis(heteroaryl)methanes in a Nanoconfined Space

2019

Herein, we show that the hexameric resorcinarene capsule C is able to catalyze the formation of bis(heteroaryl)methanes by reaction between pyrroles or indoles and carbonyl compounds (α-ketoesters or aldehydes) in excellent yields and selectivity. Our results suggest that the capsule can play a double catalytic role as a H-bond catalyst, for the initial activation of the carbonyl substrate, and as a Bronsted acid catalyst, for the dehydration of the intermediate alcohol.

supramolecular organocatalysisAlcohol02 engineering and technology010402 general chemistry01 natural sciencesCatalysislcsh:Chemistrychemistry.chemical_compoundPolymer chemistryBrønsted acid catalystOriginal ResearchChemistrySubstrate (chemistry)CapsuleH-bond catalystGeneral Chemistryself-assemblyResorcinareneSupramolecular organocatalysis; Resorcinarene hexameric capsule; Bis(heteroaryl)methanes; Self-assembly; H-bond catalyst; Brønsted acid catalyst021001 nanoscience & nanotechnology0104 chemical sciencesChemistrylcsh:QD1-999Self-assembly0210 nano-technologyBrønsted–Lowry acid–base theorySelectivityresorcinarene hexameric capsulebis(heteroaryl)methanesFrontiers in Chemistry
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2-Methylresorcinarene: a very high packing coefficient in a mono-anion based dimeric capsule and the X-ray crystal structure of the tetra-anion

2016

Mono- and tetra-deprotonated 2-methylresorcinarene anions (1 and 2) as their trans-1,4-diammoniumcyclohexane (TDAC)2+ inclusion complexes are reported. The mono-anion forms a fully closed dimeric capsule [1·H2O·MeOH]22− with a cavity volume of 165 Å3 and (TDAC)2+ as the guest with an extremely high packing coefficient, PC = 84.2%, while the tetra-anion forms a close-packed structure with two structurally isomeric tetra-anions 2a and 2b with a 50 : 50 ratio in the crystal lattice. peerReviewed

tetra-anionsta114biology010405 organic chemistryChemistryMetals and AlloysX-rayCapsuleGeneral ChemistryCrystal structureX-ray crystal structure010402 general chemistrybiology.organism_classification01 natural sciencesCatalysismono-anions0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsIonCrystallographyMaterials ChemistryCeramics and CompositesTetrata116
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Synthesis of nanostructured protein–mineral-microcapsules by sonication

2022

We propose a simple and eco-friendly method for the formation of composite protein–mineral-microcapsules induced by ultrasound treatment. Protein- and nanoparticle-stabilized oil-in-water (O/W) emulsions loaded with different oils are prepared using high-intensity ultrasound. The formation of thin composite mineral proteinaceous shells is realized with various types of nanoparticles, which are pre-modified with Bovine Serum Albumin (BSA) and subsequently characterized by EDX, TGA, zeta potential measurements and Raman spectroscopy. Cryo-SEM and EDX mapping visualizations show the homogeneous distribution of the densely packed nanoparticles in the capsule shell. In contrast to the results re…

ultraääninanotekniikkaCapsulesGeneral ChemistrySilicon DioxideCondensed Matter PhysicsSonicationmineraalitnanohiukkasetEmulsionsproteiinitkapselittoiminnalliset materiaalitmikrotekniikkaOilsemulsiotSoft Matter
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