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Catalytic asymmetric C-N cross-coupling towards boron-stereogenic 3-amino-BODIPYs.
Nat Commun
January 2025
Shenzhen Grubbs Institute and Department of Chemistry, Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong, China.
3-Amino boron dipyrromethenes (BODIPYs) are a versatile class of fluorophores widely utilized in live cell imaging, photodynamic therapy, and fluorescent materials science. Despite the growing demand for optically active BODIPYs, the synthesis of chiral 3-amino-BODIPYs, particularly the catalytic asymmetric version, remains a challenge. Herein, we report the synthesis of boron-stereogenic 3-amino-BODIPYs via a palladium-catalyzed desymmetric C-N cross-coupling of prochiral 3,5-dihalogen-BODIPYs.
View Article and Find Full Text PDFChiral Phonons Induced from Spin Dynamics via Magnetoelastic Anisotropy.
Phys Rev Lett
December 2024
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
Article Synopsis
- The proposed mechanism generates chiral phononlike excitations through magnetoelastic couplings without needing magnetic fields or out-of-plane magnetization.
- By analyzing a triangular lattice ferromagnet, the research reveals how lattice symmetry influences chirality, linking it to topological phonon classes.
- The study suggests potential applications in spintronics and phononics, emphasizing the experimental viability of measuring phonon magnetization and thermal Hall conductivity in anisotropic magnets.
Topolectrical space-time circuits.
Nat Commun
January 2025
Key Laboratory of advanced optoelectronic quantum architecture and measurements of Ministry of Education, Beijing Institute of Technology, Beijing, China.
Topolectrical circuits have emerged as a pivotal platform for realizing static topological states that are challenging to construct in other systems, facilitating the design of robust circuit devices. In addition to spatial dimensionality, synergistic engineering of both temporal and spatial degrees in circuit networks holds tremendous potential across diverse technologies, such as wireless communications, non-reciprocal electronics and dynamic signal controls with exotic space-time topology. However, the realization of space-time modulated circuit networks is still lacking due to the necessity for flexible modulation of node connections in both spatial and temporal domains.
View Article and Find Full Text PDFScrolled Poly(L-lactic acid) Single Crystals via Chain End-Induced Symmetry-Breaking.
Angew Chem Int Ed Engl
January 2025
The University of Tennessee Knoxville, Chemistry, UNITED STATES OF AMERICA.
Article Synopsis
- Single crystals that lack translational symmetry have been observed in different materials, particularly in polymers where unique structures like twisted crystals and non-flat single crystals appear.
- Researchers have discovered scrolled single crystals of poly(L-lactic acid) (PLLA), a biodegradable polymer, which differ from the typical flat crystals formed in solution.
- The scrolled structure of PLLA crystals is influenced by factors such as the polymer's molecular weight and the presence of polymer chain ends, suggesting a novel mechanism for disrupting translational symmetry in the growth of polymer single crystals.
NMR-based structure elucidation and chiral separation of N-cyclohexylmethylone, a novel designer drug.
Forensic Sci Int
December 2024
Department of Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, University of Graz, Schubertstraße 1, Graz A-8010, Austria. Electronic address:
Synthetic cathinones belong to one of the biggest and most popular classes of New Psychoactive Substances. Each year, new derivatives appear on the drug market, traded under various labels like "bath salts" or "legal highs". In recent years, the emergence of new cathinone derivatives, containing a cyclohexyl residue, has been observed.
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