Invited for the cover of this issue is Guigen Li and co‐workers at Texas Tech University and Nanjing University. The cover artwork shows that chirality phenomena exists in the universe and in nature, ...including at micro and molecular levels. Read the full text of the article at 10.1002/chem.202100700.
“Here, we discuss a new form of chirality, multilayer 3D chirality. This work presents the first asymmetric catalytic approach to multi‐layer 3D chirality and shows that one of the aromatic rings of phosphorous oxide can be a parallel plane of this chirality.” Read more about the story behind the cover in the Cover Profile and about the research itself on page 8013 ff. (DOI: 10.1002/chem.202100700).
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
Chirality patterns are commonly observed in the universe and in nature, particularly at micro‐ and macrolevels governing the origin of life on earth. Multilayer folding 3D chirality was discovered as ...a new addition to the chirality family, which is now achieved at a macromolecular level through asymmetric catalytic polymerization. These polymers show conformational flexibility upon pushing and releasing operations providing a variety of molecular energy levels. Therefore, they can have unique photo and electronic properties and it is anticipated that they will have a great impact on chemistry and materials science in the future. More information can be found in the Research Article by G. Li et al. (DOI: 10.1002/chem.202104102).
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In this work, an innovative nanocatalyst (Cu/SiO
-Pr-NH-Benz) was synthesized and applied to coupling and click reaction in an aqueous solution. This work reports an efficient and straightforward ...approach for synthesizing diverse propargylamine and 1,2,3-triazole derivatives in excellent yield and short-time reaction. Also, a novel method involving the Cu NPs supported on the SiO
nanocatalyst as a heterogeneous novel catalyst for the "
" three-component A
-coupling of aldehyde, amine, and alkynes and "
" click reaction between alkyne, benzyl halide, and sodium azide in the water at room temperature was developed. Significant advantageous such as enhanced catalytic activity with efficient recycling for the one-pot synthesis of 1,4-disubstituted triazoles and propargyl amine derivatives and in green condition were observed. Also, after five successive reactions, the catalytic activity of recycled Cu/SiO
-Pr-NH-Benz remained high without significant loss in its intrinsic activity.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Invited for the cover of this issue are Guigen Li's groups at Texas Tech University and Nanjing University. The cover artwork shows that chirality patterns exist from universal to molecular levels ...showing light emission properties. Read the full story of multilayer 3D chirality and its asymmetric catalytic synthesis at 10.1002/chem.202104102.
“The resulting multiple π‐assemblies exhibited remarkable optical properties in aggregated states… as well as reversible redox properties.” This and more about the story behind the front cover can be found in the article at 10.1002/chem.202104102).
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
Asymmetric synthesis of new atropisomerically multilayered chiral targets has been achieved by taking advantage of the strategy of center-to-multilayer chirality and double Suzuki–Miyaura couplings. ...Diastereomers were readily separated via flash column chromatography and well characterized. Absolute configuration assignment was determined by X-ray structural analysis. Five enantiomerically pure isomers possessing multilayer chirality were assembled utilizing anchors involving electron-rich aromatic connections. An overall yield of 0.69% of the final target with hydroxyl attachment was achieved over 11 steps from commercially available starting materials.
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IJS, KILJ, NUK, PNG, UL, UM
In this work, we present a strategy for the preparation of functionalized 4
H
-chromene derivatives
via
a Cs
2
CO
3
-catalyzed 4 + 2 cycloaddition of enantiopure chiral salicyl
N
-phosphonyl imines ...with allenoates. Fifteen examples were achieved in excellent yields and diastereoselectivity. The products were purified simply by washing the crude mixture with hexanes following the Group-Assisted Purification (GAP) chemistry/technology to bypass traditional separation methods. The absolute configuration was unambiguously determined by X-ray structure analysis.
A new asymmetric method for the synthesis of highly functionalized 4
H
-chromenes was developed
via
Group-Assisted Purification (GAP) chemistry and shown in good to high yield and excellent diastereoselectivity.
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