Results 61 to 70 of about 29,722,087 (208)

Catalyst-Controlled Selective Functionalization of Unactivated C–H Bonds in the Presence of Electronically Activated C–H Bonds

Journal of the American Chemical Society, 2018
A new chiral dirhodium tetracarboxylate catalyst, Rh2( S-2-Cl-5-BrTPCP)4, has been developed for C-H functionalization reactions by means of donor/acceptor carbene intermediates. The dirhodium catalyst contains four ( S)-1-(2-chloro-5-bromophenyl)-2,2-diphenylcyclopropane-1-carboxylate ligands, in which all four 2-chloro-5-bromophenyl groups are on the
Wenbin Liu, Zhi Ren, Aaron T. Bosse, Kuangbiao Liao, Elizabeth L. Goldstein, John Bacsa, Djamaladdin G. Musaev, Brian M. Stoltz, Huw M. L. Davies   +8 more
openaire   +3 more sources

C−H and C−C Bond Activation of Primary Amines through Dehydrogenation and Transimination

, 2016
Dehydrogenation and subsequent transimination of primary amines offer a new pathway for C−H bond activation, ortho-alkylation, and C−C bond activation to afford a variety of ketones in the reaction of 1-alkene by a cocatalyt system of Rh(I) and 2-amino-3-
Jun-Bae Hong (1856974), Kwan-Yong Chung (3063795), Chul-Ho Jun (1270479)   +2 more
core   +1 more source

Cooperative α-C–H activation enabled quantitative and partial photooxidation of biomass-derived 5-hydroxymethylfurfural

Green Energy & Environment
Photocatalytic activation of C–H bonds is versatile but challenging for undergoing oriented conversion processes. Herein, a spatially site-isolated heterojunction (ZS-Vs/ZIS) of ZnIn2S4 with strong Lewis acidity (ZIS) and ZnS with S-vacancy (ZS-Vs) is ...
Jie Li, Ye Meng, Yu Wen, Yinyin He, Putla Sudarsanam, Song Yang, Hu Li   +6 more
doaj   +1 more source

Effect of zeolites on the alkylation of aromatics with alkanes using a Pd nanoparticle/solid acid cooperative catalytic system

Green Carbon
The direct alkylation of benzene with alkanes is an effective method for alkylbenzene production. Our group previously discovered that a mixture of supported Pd nanoparticles and solid acids effectively promoted the alkylation of benzene with alkanes ...
Satoshi Misaki, Moe Takabatake, Shingo Hasegawa, Yuichi Manaka, Wang-Jae Chun, Ken Motokura   +5 more
doaj   +1 more source

Different Patterns of Pd-Promoted C-H Bond Activation in (Z)-4-Hetarylidene-5(4H)-oxazolones and Consequences in Photophysical Properties

Inorganics
This work aims to amplify the fluorescence of (Z)-4-hetarylidene-5(4H)-oxazolones 1 by suppression of the hula-twist non-radiative deactivation pathway by C^N-orthopalladation of the 4-hetarylidene ring.
Miguel Martínez, David Dalmau, Olga Crespo, Pilar García-Orduña, Fernando Lahoz, Antonio Martín, Esteban P. Urriolabeitia   +6 more
doaj   +1 more source

C–H bond activation of benzene and thiophene by photochemically generated rhenocene cation

International Journal of Photoenergy, 1999
A cationic rhenocene-acetonitrile adduct [Cp2Re(NCMe)](BF4)(1) reacted with an excess of benzene, thiophene, 2-methylthiophene, and pyrrole under UV irradiation to afford the C–H bond activation products [Cp2Re(H)R]BF4 (R = phenyl, 2-thienyl, 2-(5 ...
Hiroshi Ogino, Hiromi Tobita, Kouji Endo, Kiyonari Hashidzume   +3 more
doaj   +1 more source

Successive Activation of C–H and C–O Bonds of Vinyl Ethers by a Diphosphine and Hydrido-Bridged Diiridium Complex

Inorganics, 2019
The reaction of [(Cp*Ir)2(μ-dmpm)(μ-H)][OTf] (2) [Cp* = η5-C5Me5, dmpm = bis(dimethylphosphino)methane] with 2,3-dihydrofuran gives [(Cp*IrH)2(μ-dmpm){μ-(2,3-dihydrofuranyl)}][OTf] (3) in an isolated yield of 70% via the C− ...
Yoshinori Takahashi, Takuya Shimbayashi, Ken-ichi Fujita   +2 more
doaj   +1 more source

A versatile gold synthon for acetylene C–H bond activation

Dalton Transactions, 2010
The reaction of N,N'-bis(2,6-diisopropylphenyl)imidazol-2-ylidene gold hydroxide ([Au(OH)(IPr)]; 1) with acetylene and trimethylsilylacetylene derivatives cleanly leads to the formation of a gold-acetylide bond with the concomitant formation of water or trimethylsilanol. All compounds were isolated in high yield (>85%).
Fortman, G.C., Poater, A., Levell, J.W., Gaillard, S., Slawin, A.M.Z., Samuel, I.D.W., Cavallo, L, and Nolan, S.P.   +15 more
openaire   +3 more sources

Modification of Purine and Pyrimidine Nucleosides by Direct C-H Bond Activation

Molecules, 2015
Transition metal-catalyzed modifications of the activated heterocyclic bases of nucleosides as well as DNA or RNA fragments employing traditional cross-coupling methods have been well-established in nucleic acid chemistry.
Yong Liang, Stanislaw F. Wnuk
doaj   +1 more source

Nickel-Catalyzed Alkenylation and Alkylation of Fluoroarenes via Activation of C−H Bond over C−F Bond

, 2016
Nickel-Catalyzed Alkenylation and Alkylation of Fluoroarenes via Activation of C−H Bond over C−F ...
Natsuko Kashihara (2261398), Yoshiaki Nakao (1522189), Kyalo Stephen Kanyiva (2338663), Tamejiro Hiyama (2094532)   +3 more
core   +1 more source