Results 191 to 200 of about 33,071 (276)

Asymmetric α‐Alkylation With Activated and Unactivated Electrophiles by a Highly Productive and Recyclable Lewis Acid/Imidazolium Catalyst

open access: yesAngewandte Chemie International Edition, EarlyView.
An air‐stable, easily prepared, bifunctional Cu(II)/imidazolium complex enables highly enantioselective α‐alkylation of 1,3‐dicarbonyls with outstanding productivity (TON up to 1740). Highlights include broad electrophile scope spanning π‐activated and nonactivated reagents, stereo‐retentive allylation, simple catalyst synthesis, and efficient catalyst
Johanna Haußmann   +8 more
wiley   +1 more source

A Ruthenium‐(Ph‐BPE) Catalyst for Asymmetric Alkynylation of Fluoral: Enantioselection From 1 of 12 Fluxional Stereogenic‐at‐Ruthenium Complexes

open access: yesAngewandte Chemie International Edition, EarlyView.
The first enantioselective alkynylations of aqueous fluoral are described. These processes are catalyzed by an iodide‐bound ruthenium‐(Ph‐BPE)‐catalyst; an octahedral metal complex that can exist as 12 diastereomeric‐at‐metal isomers. Calculations reveal that 2 of 12 stereoisomeric complexes account for 99.9% of the Boltzmann population and that ...
Weijia Shen   +6 more
wiley   +1 more source

Advances in Chitosan Nanoparticles: A Comprehensive Review of Properties, Synthesis, Characterization, Multidisciplinary Applications, and Future Perspectives

open access: yesJournal of Applied Polymer Science, EarlyView.
This review highlights the synthesis of chitosan nanoparticles from natural sources, the thorough characterization of them, and use of microscopic and spectroscopic methods. It emphasizes that it has some indispensable properties such as being non‐toxic, antimicrobial, and capable of controlled drug release.
Mariam Sohail Mansoor   +6 more
wiley   +1 more source

Leveraging target enrichment and genome skimming (Hyb‐Seq) of herbarium collections to unlock timber DNA barcoding

open access: yesApplications in Plant Sciences, EarlyView.
Abstract Premise DNA barcoding for timber species identification requires comprehensive reference datasets, informative DNA barcodes, and cost‐effective protocols. We developed a workflow leveraging Hyb‐Seq (target capture sequencing and genome skimming) to address these challenges, and we tested it on four genera from the mahogany family (Meliaceae ...
Sidonie Bellot   +14 more
wiley   +1 more source

Echocardiographic correlates of pressure-volume-derived indices: Advancing intraoperative assessment of right ventricular function. [PDF]

open access: yesJTCVS Open
Kiarad V   +9 more
europepmc   +1 more source

Surface Charges Guided Quasi‐TEM‐mode Microwave Propagation along Dielectric Nanowire

open access: yesAdvanced Physics Research, EarlyView.
According to Maxwell's equations, a single‐conductor transmission line cannot allow TEM‐mode electromagnetic wave propagation, however, this is based upon the assumption that dielectric material is isolated from the environment. In practice, surface electrostatic charges widely existed in nano‐materials with large surface‐to‐volume ratio.
BoYan Xu   +7 more
wiley   +1 more source

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