Lift your ylides: An asymmetric, epoxy-annulation reaction mediated by a vinyl sulfonium salt converts aminoaldehydes and -ketones into fused heterocyclic epoxides. The methodology was extended to an aziridine-annulation reaction, which used complete the shortest known formal synthesis of balanol (see scheme, Ts=toluene-p-sulfonyl, Tf=trifluoromethanesulfonyl). asymmetric epoxides carbo- or heterocycles epoxidation methods is inherently challenging because two enantiotopic faces...

Meyer−Schuster rearrangements of propargylic alcohols take place readily at room temperature in toluene with 1−2 mol % PPh3AuNTf2, the presence 0.2 equiv 4-methoxyphenylboronic acid or 1 methanol. Good to excellent yields enones can be obtained from secondary and tertiary alcohols, high selectivity for E-alkene most cases. A one-pot procedure conversion primary into β-arylketones was also developed, via Meyer-Schuster rearrangement followed by Pd-catalayzed addition a boronic acid.

There is a groundswell of interest in applying phototrophic microorganisms, specifically microalgae and cyanobacteria, for biotechnology ecosystem service applications. However, there are inherent challenges associated with conventional routes to their deployment (using ponds, raceways photobioreactors) which synonymous suspension cultivation techniques. Cultivation as biofilms partly ameliorates these issues; however, based on the principles process intensification, by taking step beyond...

Physically-induced depolymerisation procedures are often preferred for obtaining alginate and chitosan oligosaccharides as they either do not use or make minimal of additional chemicals; therefore, separation the final products is facile. In this work, solutions three types with different mannuronic guluronic acid residues ratio (M/G ratio) molecular weights (Mw) one type were non-thermally processed by applying high hydrostatic pressures (HHP) up to 500 MPa (20 min) pulsed electric fields...

Diphenyl vinyl sulfonium salt and chiral amido-ketones undergo highly diastereoselective epoxy-annulation reactions in good yield. The use of a dominates the stereochemical outcome annulation reaction (reagent control is greater than substrate control), this has allowed kinetic resolution racemic to be achieved.

The development of high performance, recyclable thermoset materials for applications in plastics, composites, coatings and adhesives requires a synthetic approach where recyclability is designed into the molecular structure material. This paper describes single stage process creation from simple, low-cost building blocks, polymerisation liquid epoxy resins aliphatic amines presence an n-butyl diboronic ester, delivers epoxy-amine-dioxazaborocane with tunable physical properties including...

Easily accessible arylglycine derivatives were cyclized to azetidines by using commercially available (2-bromoethyl)sulfonium triflate in a simple and mild procedure. The high-yielding reaction has relatively broad scope was extended the synthesis of an oxetane.

This paper describes the synthesis and use of multifunctional methacrylic monomers, which contain basic (amine) functional groups, including an example in acid-labile tert-butylcarbamate-protected glycine is used to form a novel monomer. The "protected" amino acid-derived monomer (BOC-Gly-MA) copolymerized with epoxide (GMA), deliver polymers, are processed into powder coatings study filiform corrosion at surface aluminum substrate. BOC-Gly-MA-containing copolymers were shown improve...

Ylide in Aktion: Eine asymmetrische Vinylsulfonium-vermittelte Epoxyanellierung wandelt Aminoaldehyde und -ketone kondensierte heterocyclische Epoxide um. Die Methode wurde auf eine Aziridin-Anellierung übertragen, mit deren Hilfe die kürzeste Formalsynthese von Balanol abgeschlossen werden konnte (siehe Schema, Ts=p-Toluolsulfonyl, Tf=Trifluormethansulfonyl).

The planet of the azepines: Epoxy-fused azepines have been synthesized in a highly selective reaction with hemiaminals and vinyl sulfonium salts. Stereochemistry is controlled by substituent at four- or five-position hemiaminal. key step involves ring-opening hemiaminal, conjugate addition onto salt, epoxidation aldehyde situ formed sulfur ylide.

Abstract Carbon capture and storage is required to meet Paris Agreement targets. Photosynthesis nature’s carbon technology. Drawing inspiration from lichen, we engineered 3D photosynthetic cyanobacterial biocomposites (i.e., lichen mimics) using acrylic latex polymers applied loofah sponge. Biocomposites had CO 2 uptake rates of 1.57 ± 0.08 g −1 biomass d . Uptake were based on the dry at start trial incorporate used grow new as well that contained in compounds such carbohydrates. These...

Abstract A versatile and simple method is reported for the synthesis of bicyclic epoxide aziridinefused heterocycles (up to 98% yield, up 96 : 4 er or 15 1 dr), using a tandem Michael addition/ JohnsonCoreyChaykovsky annulation approach. new chiral (2‐bromoethyl)sulfonium reagent described, based on an easily available sulfide; it promotes enhances stereoselectivity in reaction.

A versatile method for the creation of multitier hierarchical structured surfaces is reported, which optimizes both antiviral and hydrophobic (easy-clean) properties. The methodology exploits availability surface-active chemical groups while also manipulating surface micro- nanostructure to control way coating interacts with virus particles within a liquid droplet. This has significant advantages over single-tier surfaces, including ability overcome droplet-pinning effect in delivering high...

Current industrial production of polymer resins is generally undertaken in large multi-tonne stirred tank reactors. These are characterised by relatively slow heating and cooling cycles, resulting long vessel cycle times extended campaigns. In this work we present a design for hybrid microwave/oil jacket proof concept system capable producing up to 4.1 kg resin per batch. By exploiting rapid volumetric effects microwave energy at 2.45 GHz, have optimised the synthetic regime, such that 3.7...

A new type of epoxy-amine-borate (EAB) hybrid material is reported for control penetrant solvent molecules into cross-linked polymer networks.

In the automotive industry, mechanical grinding is employed at finishing line rectification to remove defects left over from upstream, which may also result in microstructure modification within near-surface region of work piece and, consequently, affects its corrosion performance. The present investigates influence on and behaviour Al–Si–Mg (A356) alloy castings order advance understanding potential issues. It found that a deformed layer with maximum thickness 3 μm, characterised by...

Significant increases in the reaction rate and final conversion of a model polyesterification are reported by use microwave heating.

Abstract Precise control of microparticle movement is crucial in high throughput processing for various applications scalable manufacturing, such as particle monolayer assembly and 3D bio-printing. Current techniques using acoustic, electrical optical methods offer precise manipulation advantages, but their scalability restricted due to issues as, input powers complex fabrication operation processes. In this work, we introduce the concept capillary wave tweezers, where mm-scale fields are...

The synthesis of a high-performance oxidative cross-linked thermoset alkyd coating is described that utilizes novel recycling strategy from contaminated postconsumer waste polyethylene terephthalate (wPET). A single-stage "depolymerization-repolymerization" process has been developed allows the exploitation stream commercial PET with 95% efficiency, which, when copolymerized glycerol and tall oil fatty acid, delivers sustainable acid-functional polyester suitable for use in coatings....

Abstract In the presence of [Au(PPh 3 )]NTf 2 and MeOH or 4‐methoxyphenylboronic acid, propargylic alcohols undergo convenient rearrangement to enones.

Abstract The synthesis of N‐substituted azetidines is extended to the preparation an oxetane (X) under similar conditions.