The asymmetric unit of the title compound, [Sn(C(6)H(5))(2)(C(12)H(9)N(3)OS)], contains two independent mol-ecules with almost identical configurations. In each mol-ecule, the Sn(IV) atom is coordinated by O, N and S atoms from a (2-oxido-1-naph-thaldehyde)-thio-semicarbazonato ligand and two C atoms from phenyl rings in a distorted trigonal-bipyramidal geometry. Weak inter-molecular N-H⋯O and N-H⋯S hydrogen bonds link four mol-ecules into a centrosymmetric tetra-mer. The crystal packing exhibits short inter-molecular S⋯S contacts of 3.335 (3) Å.
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http://dx.doi.org/10.1107/S1600536810054024 | DOI Listing |
PLoS One
January 2025
Department of Ophthalmology, Keck School of Medicine, USC Roski Eye Institute, University of Southern California, Los Angeles, California, United States of America.
Failure of central nervous system (CNS) axons to regenerate after injury results in permanent disability. Several molecular neuro-protective and neuro-regenerative strategies have been proposed as potential treatments but do not provide the directional cues needed to direct target-specific axon regeneration. Here, we demonstrate that applying an external guidance cue in the form of electric field stimulation to adult rats after optic nerve crush injury was effective at directing long-distance, target-specific retinal ganglion cell (RGC) axon regeneration to native targets in the diencephalon.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Max-Planck-Institut fur Kohlenforschung, Organometallic Chemistry, Kaiser-Wilhelm-Platz 1, 45470, Mülheim/Ruhr, GERMANY.
Ynamides, when reacted with H2 or HBpin in the presence of [Cp*RuCl]4, convert into chiral-at-metal Fischer carbenes by regioselective gem-hydrogenation or gem-hydroboration of the polarized triple bond, respectively. gem-Hydroboration concomitantly affords a carbogenic borylated stereocenter adjacent to the ruthenium carbene unit, the configuration of which can be controlled using an Evans auxiliary. These are the first examples of asymmetric gem-addition reactions to alkynes known in the literature; representative pianostool ruthenium carbene complexes formed by this unconventional route were characterized by crystallographic and spectroscopic means.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Changchun Institute of Applied Chemistry Chinese Academy of Sciences: Chang Chun Institute of Applied Chemistry Chinese Academy of Sciences, Jilin Province Key Lab of Green Chemistry and Process, CHINA.
A modular approach was developed for the first catalytic asymmetric total syntheses of naturally occurring C30 terpene quinone methides and their non-natural stereoisomers, which feature the presence of an unprecedented spiro[4.4]nonane-containing 6-6-6-5-5-3 hexacyclic skeleton. Resting on a chiral phosphinamide-catalyzed enantioselective reduction of 2,2-disubstituted cyclohexane-1,3-dione, a concise route for the synthesis of enantioenriched 6-6 bicyclic fragment was developed.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Korea University, Seongbuk-gu, Korea, Republic of (South).
Background: In rapidly developing countries like India, individuals undergo fluctuations in social status throughout their lives. However, there have been few investigations of the link between life course socioeconomic status and cognitive function in late middle age, particularly regarding whether upward and downward mobility exert symmetric effects. Furthermore, limited attention has been directed toward understanding gender heterogeneity within this association.
View Article and Find Full Text PDFActa Crystallogr F Struct Biol Commun
February 2025
Graduate School of Life Science, Hokkaido University, Kita 10, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
The bacterial enzyme tRNA 2-selenouridine synthase (SelU) catalyzes the conversion of 5-substituted 2-thiouridine (R5S2U) to 5-substituted 2-selenouridine (R5Se2U) at the wobble positions of several tRNAs. Seleno-modification potentially regulates translation efficiency in response to selenium availability. Notably, SelU uses the 2-geranylthiouridine (R5geS2U) intermediate for sulfur removal, and this geranylthiol (geS) is a unique leaving group among tRNA-maturation enzymes.
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