varian vrx 300s (Varian Medical)
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Varian Medical
varian vrx 300s
Varian Vrx 300s, supplied by Varian Medical, used in various techniques. Bioz Stars score: 86/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
https://www.bioz.com/product/vrx+300s/nmr+spectra/pmc11460725__jo4c01648_si_001-2-22-22
Average 86 stars, based on 1 article reviews
Varian Vrx 300s, supplied by Varian Medical, used in various techniques. Bioz Stars score: 86/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
https://www.bioz.com/product/vrx+300s/nmr+spectra/pmc11460725__jo4c01648_si_001-2-22-22
Average 86 stars, based on 1 article reviews
varian vrx 300s - by Bioz Stars,
2026-10
86/100 stars
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Nuclear Magnetic Resonance:Article Title: Stereoselective NaN3-catalyzed halonitroaldol-type reaction of azetidine-2,3-diones in aqueous media. Article Snippet: Azetidine-2,3-diones (a-oxo-b-lactams) and bromonitromethane undergo coupling in aqueous media in the presence of catalytic amounts of sodium azide.. The stereoselectivity of the process was generally good, proceeding with reasonable anti : syn ratios under substrate control.. On this basis, a simple and fast protocol for the synthesis of the potentially bioactive 3-substituted 3-hydroxy-b-lactam moiety has been developed. Article Title: Striking alkenol versus allenol reactivity: metal-catalyzed chemodifferentiating oxycyclization of enallenols. Article Snippet: Tetrahydrofuran and pyran rings are present in a wide variety of natural products and biologically relevant compounds, so the development of synthetic methods for their construction has attracted much attention.. Of the possible approaches, transition-metal-catalyzed intramolecular addition of oxygen nucleophiles across carbon–carbon double bonds is one of the most rapid and convenient methods for the preparation of oxygen heterocycles.. In particular, the heterocyclization of allenes, a class of compounds containing two cumulative carbon–carbon double bonds, is intriguing from the point of view of regioselectivity. Article Title: Gold-catalyzed bis-cyclization of 1,2-diol- or acetonide-tethered alkynes. Synthesis of ?-lactam-bridged acetals: a combined experimental and theoretical study Article Snippet: .. 1H NMR and 13C NMR spectra were recorded on a Bruker Avance AVIII-700 with cryoprobe, Bruker AMX-500, Bruker Avance-300, Article Title: Ring Expansion versus Cyclization in 4-Oxoazetidine-2- carbaldehydes Catalyzed by Molecular Iodine: Experimental and Theoretical Study in Concert Article Snippet: .. 1H NMR and 13C NMR spectra were recorded on a Bruker AMX-500, Bruker Avance-300, Article Title: Synthesis of fused or not β-lactam-biaryl hybrids by free radical aryl–aryl coupling of 2-azetidinone-tethered haloarenes Article Snippet: cis and trans-Aryl-2-azetidinone-tethered haloarenes can be stereoselectively prepared using the ketene–imine cyclization.. These b-lactam-tethered haloarenes were used for the regiocontrolled preparation of b-lactam-biaryl hybrids including fused tetracyclic biaryl-2azetidinones as well as C4-dearylated not fused biphenyl-2-azetidinones via aryl–aryl radical cyclization and/or rearrangement.. Alternatively, trans-dibenzocarbacephems could be stereoselectively prepared, both in racemic and enantiopure form, through the Staudinger reaction between phenanthridine and activated ketenes. q 2005 Elsevier Ltd. All rights reserved. Article Title: Lewis acid-assisted ene cyclization of 2-azetidinone-tethered enals: synthesis of enantiopure carbacepham derivatives. Article Snippet: The b-lactam nucleus is the central core of the most important pharmacophores for treatment of diseases caused by bacterial infections.. Besides, there are many important nonantibiotic uses of 2-azetidinones in fields ranging from enzyme inhibition to gene activation.. These biological activities, combined with the fact that b-lactams are useful intermediates for the preparation of a variety of highadded-value products, provide the motivation to explore new methodologies toward the preparation of new b-lactam derivatives. |