نتایج جستجو برای: bromides

تعداد نتایج: 13171  

Journal: :Chemical Communications 2021

Preassociation of the substrate close to photoredox catalyst increases its efficiency, shown using pillarene-bound phenothiazines in reduction alkyl bromides.

Journal: :Molecules 2010
Seung-Hoi Kim Reuben D Rieke

A practical synthetic route for the preparation of 2-pyridyl and 3-pyridyl derivatives has been accomplished by utilizing a simple coupling reaction of stable 2-pyridylzinc bromides and 3-pyridylzinc bromides. The organozincs used in this study were easily prepared via the direct insertion of active zinc into the corresponding bromopyridines. The subsequent coupling reactions with a variety of ...

2016
Roman Yu Peshkov Elena V Panteleeva Wang Chunyan Evgeny V Tretyakov Vitalij D Shteingarts

A convenient one-pot approach to alkylcyanobiaryls is described. The method is based on biaryl cross-coupling between the sodium salt of the terephthalonitrile dianion and a neutral aromatic nitrile in liquid ammonia, and successive alkylation of the long-lived anionic intermediate with alkyl bromides. The reaction is compatible with benzonitriles that contain methyl, methoxy and phenyl groups,...

2014
Shaozhong Ge Wojciech Chaładaj John F. Hartwig

We report the Pd-catalyzed α-arylation of α,α-difluoroketones with aryl and heteroaryl bromides and chlorides catalyzed by an air- and moisture-stable palladacyclic complex containing P(t-Bu)Cy2 as ligand. The combination of this Pd-catalyzed arylation and base-induced cleavage of the acyl-aryl C-C bond within the α-aryl-α,α-difluoroketone constitutes a one-pot, two-step procedure to synthesize...

2016
Jiří Schulz Filip Horký Kei Manabe

A hydrophilic phosphinobiphenyl amidosulfonate, 2′-(dicyclohexylphosphino)-2{[(sulfonatomethyl)amino]carbonyl}[1,1′-biphenyl], triethylammonium salt (L2), was prepared and, together with its isomer bearing the polar amido-sulfonate tag in the position 4 of the biphenyl scaffold (compound L1), evaluated as a supporting ligand in Pd-catalyzed cyanation of aryl bromides using K4[Fe(CN)6] as the no...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2013
M Teresa Garcia Isabel Ribosa Lourdes Perez Angeles Manresa Francesc Comelles

Two series of long chain imidazolium- and pyridinium-based ionic liquids containing an ester functional group in the alkyl side chain, 3-methyl-1-alkyloxycarbonylmethylimidazolium bromides (C(n)EMeImBr) and 1-alkyloxycarbonylmethylpyridinium bromides (C(n)EPyrBr), were synthesized and their thermal stability, aggregation behavior in aqueous medium, and antimicrobial activity investigated. The i...

Journal: :Organic & biomolecular chemistry 2012
Deepak B Biradar Han-Mou Gau

Highly efficient and simple coupling reactions of benzylic bromides or chlorides with alkenylaluminum reagents catalyzed by NiCl(2)(PPh(3))(2) are reported. The coupling reactions proceed effectively at room temperature employing low loading of catalyst, 0.5 mol% for benzylic bromides having either electron-donating or -withdrawing substituents on the aromatic ring, affording coupling products ...

Journal: :Organometallics 2015
Phillip J Milner Yang Yang Stephen L Buchwald

A thorough investigation of the challenging Pd-catalyzed fluorination of five-membered heteroaryl bromides is presented. Crystallographic studies and density functional theory (DFT) calculations suggest that the challenging step of this transformation is C-F reductive elimination of five-membered heteroaryl fluorides from Pd(II) complexes. On the basis of these studies, we have found that vario...

Journal: :Chemical communications 2010
Xiaoyu Yan Yiqing Zhou Chanjuan Xi

Reaction of alkynylzirconates with allyl bromides afforded β-allyl-zirconacyclopentadienes with high selectivity in unique reaction site.

2016
Matthieu Jouffroy Christopher B. Kelly Gary A. Molander

Hypervalent alkylsilicates represent new and readily accessible precursors for the generation of alkyl radicals under photoredox conditions. Alkyl radicals generated from such silicates serve as effective hydrogen atom abstractors from thiols, furnishing thiyl radicals. The reactive sulfur species generated in this manner can be funneled into a nickel-mediated cross-coupling cycle employing aro...

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