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Showing 9985 to 9996 of 41838 entries
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Amide to Alkyne Interconversion via a Nickel/Copper-Catalyzed Deamidative Cross-Coupling of Aryl and Alkenyl Amides.

Organic letters

Srimontree W, Chatupheeraphat A, Liao HH, Rueping M.
PMID: 28581761
Org Lett. 2017 Jun 16;19(12):3091-3094. doi: 10.1021/acs.orglett.7b01194. Epub 2017 Jun 05.

A nickel-catalyzed deamidative cross-coupling reaction of amides with terminal alkynes as coupling partners was disclosed. This newly developed methodology allows the direct interconversion of amides to alkynes and enables a facile route for C(sp2)-C(sp) bond formation in a straightforward...

An Expeditious Synthesis of Sialic Acid Derivatives by Copper(I)-Catalyzed Stereodivergent Propargylation of Unprotected Aldoses.

ACS central science

Wei XF, Shimizu Y, Kanai M.
PMID: 27163022
ACS Cent Sci. 2016 Jan 27;2(1):21-6. doi: 10.1021/acscentsci.5b00360. Epub 2016 Jan 04.

We developed a copper(I)-catalyzed stereodivergent anomeric propargylation of unprotected aldoses as a facile synthetic pathway to a broad variety of sialic acid derivatives. The soft allenylcopper(I) species, catalytically generated from stable allenylboronic acid pinacolate (2), is unusually inert to...

A Direct Grain-Boundary-Activity Correlation for CO Electroreduction on Cu Nanoparticles.

ACS central science

Feng X, Jiang K, Fan S, Kanan MW.
PMID: 27163043
ACS Cent Sci. 2016 Mar 23;2(3):169-74. doi: 10.1021/acscentsci.6b00022. Epub 2016 Mar 07.

Copper catalyzes the electrochemical reduction of CO to valuable C2+ products including ethanol, acetate, propanol, and ethylene. These reactions could be very useful for converting renewable energy into fuels and chemicals, but conventional Cu electrodes are energetically inefficient and...

A mechanistic investigation of the photoinduced, copper-mediated cross-coupling of an aryl thiol with an aryl halide.

Chemical science

Johnson MW, Hannoun KI, Tan Y, Fu GC, Peters JC.
PMID: 28044096
Chem Sci. 2016 Jul 01;7(7):4091-4100. doi: 10.1039/C5SC04709A. Epub 2016 Feb 24.

Photoinduced, copper-catalyzed cross-coupling can offer a complementary approach to thermal (non-photoinduced) methods for generating C-X (X = C, N, O, S, etc.) bonds. In this report, we describe the first detailed mechanistic investigation of one of the processes that...

Highly Enantioselective Copper- and Iron-Catalyzed Intramolecular Cyclopropanation of Indoles.

Journal of the American Chemical Society

Xu H, Li YP, Cai Y, Wang GP, Zhu SF, Zhou QL.
PMID: 28548850
J Am Chem Soc. 2017 Jun 14;139(23):7697-7700. doi: 10.1021/jacs.7b03086. Epub 2017 Jun 02.

We report the first intramolecular enantioselective cyclopropanation of indoles, which was accomplished in good to high yield (up to 94%) with excellent enantioselectivity (up to >99.9% ee) by using copper or iron complexes of chiral spiro bisoxazolines as catalysts....

Model System Study of Environmentally Persistent Free Radicals Formation in a Semiconducting Polymer Modified Copper Clay System at Ambient Temperature.

RSC advances

Nwosu UG, Khachatryan L, Youm SG, Roy A, Dela Cruz ALN, Nesterov EE, Dellinger B, Cook RL.
PMID: 28670444
RSC Adv. 2016;6(49):43453-43462. doi: 10.1039/C6RA08051K. Epub 2016 Apr 28.

This paper systematically investigates how environmentally persistent free radicals (EPFRs) are formed in a phenol contaminated model soil. Poly-

Redox-Driven Migration of Copper Ions in the Cu-CHA Zeolite as Shown by the In Situ PXRD/XANES Technique.

Angewandte Chemie (International ed. in English)

Andersen CW, Borfecchia E, Bremholm M, Jørgensen MRV, Vennestrøm PNR, Lamberti C, Lundegaard LF, Iversen BB.
PMID: 28670829
Angew Chem Int Ed Engl. 2017 Aug 21;56(35):10367-10372. doi: 10.1002/anie.201703808. Epub 2017 Jul 24.

Using quasi-simultaneous in situ PXRD and XANES, the direct correlation between the oxidation state of Cu ions in the commercially relevant deNO

Copper-Mediated Nucleophilic Addition/Cascade Cyclization of Aryl Diynes.

Organic letters

Sinclair GS, Yang T, Wang S, Chen WH, Schipper DJ.
PMID: 28145716
Org Lett. 2017 Feb 17;19(4):802-805. doi: 10.1021/acs.orglett.6b03787. Epub 2017 Feb 01.

Treatment of diyne substrates with sulfinate salts under the action of copper(II) triflate results in a cascade cyclization reaction. The reaction involves nucleophilic addition of the sulfinate and formation of two new C-C bonds with concomitant cleavage of an...

A new preparation of a bifunctional crystalline heterogeneous copper electrocatalyst by electrodeposition using a Robson-type macrocyclic dinuclear copper complex for efficient hydrogen and oxygen evolution from water.

Dalton transactions (Cambridge, England : 2003)

Majumder S, Abdel Haleem A, Nagaraju P, Naruta Y.
PMID: 28671221
Dalton Trans. 2017 Jul 18;46(28):9131-9139. doi: 10.1039/c7dt01594a.

The development of low-cost, stable bifunctional electrocatalysts, which operate in the same electrolyte with a low overpotential for water splitting, including the oxygen evolution reaction and the hydrogen evolution reaction, remains an attractive prospect and a great challenge. In...

Unconventional High-Energy-State Contribution to the Cooper Pairing in the Underdoped Copper-Oxide Superconductor HgBa_{2}Ca_{2}Cu_{3}O_{8+δ}.

Physical review letters

Loret B, Sakai S, Gallais Y, Cazayous M, Méasson MA, Forget A, Colson D, Civelli M, Sacuto A.
PMID: 27232035
Phys Rev Lett. 2016 May 13;116(19):197001. doi: 10.1103/PhysRevLett.116.197001. Epub 2016 May 11.

We study the temperature-dependent electronic B_{1g} Raman response of a slightly underdoped single crystal HgBa_{2}Ca_{2}Cu_{3}O_{8+δ} with a superconducting critical temperature T_{c}=122  K. Our main finding is that the superconducting pair-breaking peak is associated with a dip on its higher-energy...

Direct patterning of highly-conductive graphene@copper composites using copper naphthenate as a resist for graphene device applications.

Nanoscale

Bi K, Xiang Q, Chen Y, Shi H, Li Z, Lin J, Zhang Y, Wan Q, Zhang G, Qin S, Zhang X, Duan H.
PMID: 29072744
Nanoscale. 2017 Nov 09;9(43):16755-16763. doi: 10.1039/c7nr05779b.

We report an electron-beam lithography process to directly fabricate graphene@copper composite patterns without involving metal deposition, lift-off and etching processes using copper naphthenate as a high-resolution negative-tone resist. As a commonly used industrial painting product, copper naphthenate is extremely...

Preparation of MgAl-EDTA-LDH based electrospun nanofiber membrane and its adsorption properties of copper(II) from wastewater.

Journal of hazardous materials

Chen H, Lin J, Zhang N, Chen L, Zhong S, Wang Y, Zhang W, Ling Q.
PMID: 29128721
J Hazard Mater. 2018 Mar 05;345:1-9. doi: 10.1016/j.jhazmat.2017.11.002. Epub 2017 Nov 08.

Adsorption is recognized as one of the most promising technologies applied to remove heavy metals from contaminated water. However, the adsorption efficiency often decreases because of the aggregation and loss of adsorbents. Herein, a novel adsorbent was synthesized by...

Showing 9985 to 9996 of 41838 entries