Results 311 to 320 of about 195,903 (365)
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Polarity Umpolung Strategy for the Radical Alkylation of Alkenes.
Angewandte Chemie, 2020Free radical-mediated alkylation of general alkenes is a challenging and largely unmet goal. Herein, we disclose a conceptually novel "polarity umpolung" strategy for radical alkylation of alkenes using a portfolio of easily-accessed, dual-function ...
Jige Liu +7 more
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Nature Reviews Chemistry, 2021
The seminal paper by Yves Chauvin and Jean-Louis Herisson on the mechanism of alkene metathesis is elegant, simple and insightful. Published more than 50 years ago, it deserves appreciation and admiration even today.
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The seminal paper by Yves Chauvin and Jean-Louis Herisson on the mechanism of alkene metathesis is elegant, simple and insightful. Published more than 50 years ago, it deserves appreciation and admiration even today.
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Journal of the American Chemical Society, 2020
Stereoselective synthesis of trisubstituted alkenes is a long-standing challenge in organic chemistry, due to the small energy differences between E and Z isomers of trisubstituted alkenes (compared with 1,2-disubstituted alkenes).
Shu-wei Zhang +5 more
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Stereoselective synthesis of trisubstituted alkenes is a long-standing challenge in organic chemistry, due to the small energy differences between E and Z isomers of trisubstituted alkenes (compared with 1,2-disubstituted alkenes).
Shu-wei Zhang +5 more
semanticscholar +1 more source
Chemistry – A European Journal, 2008
AbstractSilylmetalation of alkenes is challenging due to the low reactivity of the substrates. In contrast, carbometalation of alkenes has been realized through several innovative methods, including activation of the reagent and the substrate. A similar approach could be applicable to silylmetalation of alkenes, and we have recently developed a bimetal
Shinji, Nakamura +2 more
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AbstractSilylmetalation of alkenes is challenging due to the low reactivity of the substrates. In contrast, carbometalation of alkenes has been realized through several innovative methods, including activation of the reagent and the substrate. A similar approach could be applicable to silylmetalation of alkenes, and we have recently developed a bimetal
Shinji, Nakamura +2 more
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2020
Visualising molecules in 3D is hard. Fortunately, chemists use quite a few of the important stereochemical concepts and terms to describe the shapes of more 2D molecules, like alkenes. So, even if you really came to this book to learn about chirality and conformations in molecules with sp3 carbon atoms, we suggest you venture first into the sp2 world ...
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Visualising molecules in 3D is hard. Fortunately, chemists use quite a few of the important stereochemical concepts and terms to describe the shapes of more 2D molecules, like alkenes. So, even if you really came to this book to learn about chirality and conformations in molecules with sp3 carbon atoms, we suggest you venture first into the sp2 world ...
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1996
This chapter considers the relations between alkanes, alkenes, and alkynes, noting that the first general characteristic of alkenes and alkynes is their tendency to be attacked by electrophiles. It mentions that the spherical s orbital of C may be regarded as near to the positive nucleus, while the pear-shaped p orbital may be considered as farther ...
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This chapter considers the relations between alkanes, alkenes, and alkynes, noting that the first general characteristic of alkenes and alkynes is their tendency to be attacked by electrophiles. It mentions that the spherical s orbital of C may be regarded as near to the positive nucleus, while the pear-shaped p orbital may be considered as farther ...
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Ni-Catalyzed Reductive Difunctionalization of Alkenes
Synthesis, 2020Alkene difunctionalization represents one of the most efficient methods to synthesize highly functionalized molecules from simple and readily available starting materials.
Yu Ping, Wangqing Kong
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Highly Efficient Alkene-Alkene and Arene-Alkene Coupling Reactions with Vicinal Dibromides
Synlett, 1990Palladium-catalyzed twofold coupling reactions of 1,2-dibromocycloalkenes 4, 7 with alkenes 2 give high yields of (E,Z,E)-1.3,5-hexatrienes 5, 8 which thermally cyclize to ringannulated 1,3-cyclohexadienes 6, 9. Two-, three- and fourfold Heck type coupling reactions were also achieved with vicinal di-13, tri- 16, and tetrabromobenzene 18 under ...
Annegret Lansky +2 more
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Visible-light photocatalytic di- and hydro-carboxylation of unactivated alkenes with CO2
Nature Catalysis, 2022Lei Song +8 more
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Angewandte Chemie, 2018
Catalytic alkene difunctionalization via Si-H and C-H activations represents an ideal atom- and step-economic pathway for quick assembly of molecular complexity. We herein developed a visible-light-promoted metal-free difunctionalization of alkenes using
Jing Hou +5 more
semanticscholar +1 more source
Catalytic alkene difunctionalization via Si-H and C-H activations represents an ideal atom- and step-economic pathway for quick assembly of molecular complexity. We herein developed a visible-light-promoted metal-free difunctionalization of alkenes using
Jing Hou +5 more
semanticscholar +1 more source