Results 101 to 110 of about 175,047 (318)

Asymmetric synthesis of 3-substituted 8-hydroxy-3,4-dihydroisocoumarins from (S)-4-isopropyl-2-(2-methoxy-6-methylphenyl)oxazoline [PDF]

open access: yes, 2007
Reaction of the laterally lithiated (S)-4-isopropyl-2-(2-methoxy-6-methylphenyl)oxazoline with p-tolualdehyde gave an inseparable mixture of the addition products in low diastereoselectivity.
Iwao, Masatomo   +2 more
core   +1 more source

Additive Manufacturing of Continuous Fibre Reinforced Composites: Process, Characterisation, Modelling, and Sustainability

open access: yesAdvanced Engineering Materials, EarlyView.
Additive manufacturing provides precise control over the placement of continuous fibres within polymer matrices, enabling customised mechanical performance in composite components. This article explores processing strategies, mechanical testing, and modelling approaches for additive manufactured continuous fibre‐reinforced composites.
Cherian Thomas, Amir Hosein Sakhaei
wiley   +1 more source

Asymmetric synthesis using sulfimides [PDF]

open access: yes
Asymmetric synthesis, the synthesis of chiral molecules, has developed into one of the most important areas of chemistry. Numerous methods are used to prepare chiral compounds, one of which involves using chiral acyl anion equivalents.
Sparey, Tim
core  

Carbohydrate-Based Hydrogels: Weaving Nature’s Versatility into Biomedical Innovation

open access: yesInternational Journal of Nanomedicine
Camilla Maria Cova, Alessio Zuliani, Noureddine Khiar Asymmetric Synthesis and Nanosystems Group (Art&Fun), Institute for Chemical Research (IIQ), CSIC-University of Seville, Seville, 41092, SpainCorrespondence: Noureddine Khiar, Asymmetric Synthesis
Cova CM, Zuliani A, Khiar N
doaj  

Computational investigation of functionalized BTBT-based molecules for organic solar energy harvesting: DFT and TD-DFT study

open access: yesScientific African
In this study, we present the design and theoretical investigation of four novel π-conjugated acceptor molecules (M1-M4), derived from the recently synthesized core structure 2,7-bis(4-octylthiophene-2-yl)BTBT, by functionalizing it with different ...
Walid Taouali, Kamel Alimi
doaj   +1 more source

Natural Bone‐Derived Ceramic Scaffolds Functionalized with Chitosan‐Gold, Chitosan‐Magnesium, and Chitosan‐Zinc for Enhanced Antibacterial Activity

open access: yesAdvanced Engineering Materials, EarlyView.
This study reports the development of antibacterial ceramic scaffolds derived from natural bovine bone. The bones were processed through sequential boiling and hydrogen peroxide treatment to remove organic matter, producing porous, mineral‐rich scaffolds.
Mohamad Hassan Taherian   +6 more
wiley   +1 more source

Novel Chiral Diamines and (S)-6-Chloronicotine Derivatives as Catalysts for Asymmetric Synthesis

open access: yes, 2009
Many enantiomerically pure products with biological activities are commonly used in the pharmaceutical industry due to their effectiveness. As such, procedures that produce stereochemically pure compounds are highly desirable.
Capracotta, Sonja Siefert
core  

Catalytic Asymmetric Synthesis of Geminal-Dicarboxylates

open access: yes, 2018
Stereogenic acetals, spiroacetals and ketals are well-studied stereochemical features that bear two heteroatoms at a common carbon atom. These stereocenters are normally found in cyclic structures while linear (or acyclic) analogues bearing two ...
Stephen P., Fletcher, Nisha, Mistry
core   +1 more source

Microstructure, Thermal Transport, and Dry‐Sliding Tribology of Powder‐Metallurgy Al7075 Composites Reinforced With Sol–Gel‐Derived ZnO–rGO Hybrid Nanoparticles

open access: yesAdvanced Engineering Materials, EarlyView.
Sol–gel‐derived ZnO–rGO hybrid nanoparticles enable Al7075 powder‐metallurgy composites to achieve concurrent gains in hardness and thermal conductivity while markedly lowering friction and wear. The hybrid architecture couples ZnO‐based load support with rGO‐assisted lamellar sliding and heat spreading, revealing a promising route toward lightweight ...
Bunyamin Aksakal   +3 more
wiley   +1 more source

From Food to Power: Hydrogel Thermoelectrics for Ingestible Electronics

open access: yesAdvanced Functional Materials, EarlyView.
We introduce a fully edible thermoelectric–electrochromic platform that harvests heat from food and converts it into a visible color change. N‐type and p‐type hydrogel thermoelectric generators connected in series power anthocyanin‐based electrochromic displays, demonstrating the feasibility of safe, biodegradable, ingestible systems for on‐food ...
Antonia Georgopoulou   +3 more
wiley   +1 more source

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