Results 261 to 270 of about 31,423,583 (299)
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2013
Transition metal-catalyzed carbonylation reactions represent an enormous toolbox for CO–X bond formation (X = C, N, O, etc.). While most coupling reactions take place with heteronucleophiles nowadays, carbonylations including C–H activation are attracting more and more attention because the use of stoichiometric amounts of organometallic reagents can ...
Matthias Beller, Xiao-Feng Wu
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Transition metal-catalyzed carbonylation reactions represent an enormous toolbox for CO–X bond formation (X = C, N, O, etc.). While most coupling reactions take place with heteronucleophiles nowadays, carbonylations including C–H activation are attracting more and more attention because the use of stoichiometric amounts of organometallic reagents can ...
Matthias Beller, Xiao-Feng Wu
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C–H bond activation of ethylene by a zirconacycle
Chemical Communications, 2013The reaction of C2H4 and β-SiH containing azasilazirconacycle Cp2Zr{κ(2)-N(SiHMe2)SiHMeCH2} (3), formed via a γ-abstraction reaction of Cp2Zr{N(SiHMe2)2}H (1), follows an unusual pathway in which a rare σ-bond metathesis reaction of ethylene generates a vinyl intermediate. That species undergoes a β-hydrogen abstraction under the reaction conditions to
KaKing, Yan, Aaron D, Sadow
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A Minimalist Approach to CH Activation by Copper
Helvetica Chimica Acta, 2006AbstractThe complex [Cu2(1)2]2+ (1 = 1,3‐bis(1‐methyl‐1H‐benzimidazol‐2‐yl)benzene) undergoes slow oxidation by dioxygen in DMF solution to give the hydroxylated product [Cu2(2‐H)2]2+ (2 = 2,6‐bis(1‐methyl‐1H‐benzimidazol‐2‐yl)phenol) characterized by an X‐ray crystal‐structure analysis. The oxidation occurs much faster when CuII is mixed with 1 in the
Kuebel Pollak, Anita +5 more
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Diastereoselective Remote CH Activation by Hydroboration
Chemistry – A European Journal, 2004Abstract Hydroboration of tetrasubstituted or trisubstituted alkenes with BH 3 and subsequent thermolysis allows remote diastereoselective CH activation of neighboring aryl rings.
Jesús A, Varela +6 more
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Catalytic activation of aromatic CH bonds
Journal of Organometallic Chemistry, 1982Abstract A new reaction is described, involving oxidative addtion of aromatic bromides to palladium(O), two successive insertions of norbornene, and ring closure to the aromatic carbon ortho to the carbon originally bearing the bromine.
CATELLANI, Marta, CHIUSOLI, Gian Paolo
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Enantioselective Double C−H Activation of Dihydronaphthalenes
Organic Letters, 2005[reaction: see text] Dirhodium tetrakis((S)-N-dodecylbenzenesulfonyl)prolinate) (Rh2(S-DOSP)4) catalyzed reaction of 1,2-dihydronaphthalenes with an excess of methyl vinyldiazoacetates results in a formal double C-H activation, generating four new stereogenic centers with very high stereoselectivity.
Huw M L, Davies, Qihui, Jin
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Photocatalysis in C-H Activation
1993The catalytic chemistry of organometallic complexes usually depends on coordinative unsaturation. Most substrates can only bind if an empty orbital is available on the metal to receive it. One way in which photochemistry can facilitate catalysis is to generate coordinative unsaturation by photoextrusion of a ligand. Photoextrusion of CO and H2 are both
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C-H activation: Good things come in threes.
Nature chemistry, 2016Three different methods that use a single ruthenium catalyst to enable the facile formation of meta- and para-substituted alkenylarenes have now been developed. The reactions proceed through a tandem alkenylation/decarboxylation process and provide several advantages over alternative approaches.
Simonetti, Marco, Larrosa, Igor
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Modulation of Noncoding RNAs (ncRNAs) and Their Potential Role as Therapeutics
Medical Epigenetics, 2021Luciano Pirola +2 more
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