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Electron paramagnetic resonance (EPR) study of free radicals in irradiated zinc poly methacrylate

01.03.2015 | Author(s): S. Galindo , F. Ureña-Núñez, Radiation Physics and Chemistry, 2015

Publication date: June 2015 Source:Radiation Physics and Chemistry, Volume 111 Author(s): S. Galindo , F. Ureña-Núñez We report the analysis of the X-band EPR spectrum of the free radical species formed in Zn(II) polymethacrylate (Zn(II) PMA), after degradation was induced in this polymer ...

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Preparation of Copper-Embedded Graphene Nanocomposites for Catalytic Hydroxylation of Benzene to Phenol

28.02.2015 | Bi, Huiping; He, Guangyu; Xu, Ran; Song, Zhiqi; Zhu, Junwu; Chen, Haiqun; Wang, Xin, Organic Chemistry, 2015

Abstract: The design and synthesis of graphene-based nanocomposites have drawn enormous attention in recent years owing to their unique structural properties. Here, we describe a simple hydrothermal procedure to fabricate Cu-graphene nanocomposites as a catalyst for direct hydroxylating ...

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Investigation of Suzuki–Miyaura catalyst‐transfer polycondensation of AB‐type fluorene monomer using coordination‐saturated aryl Pd(II) halide complexes as initiators

27.02.2015 | Zilong Zhang, Pan Hu, Xiao Li, Hongmei Zhan, Yanxiang Cheng, Journal of Polymer Science Part A: Polymer Chemistry, 2015

ABSTRACT Novel triarylamine‐based coordination‐saturated aryl Pd(II) halide complexes ligated by PEt3, PCy3, and P(o‐tol)3 were successfully synthesized by direct oxidative addition of aryl halide to the corresponding Pd(0) precursors. Suzuki–Miyaura coupling polymerization of ...

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A one-pot strategy to synthesize [small beta]-ketophosphonates: silver/copper catalyzed direct oxyphosphorylation of alkynes with H-phosphonates and oxygen in the air

27.02.2015 | Xin Chen; Xu Li; Xiao-Lan Chen; Ling-Bo Qu; Jian-Yu Chen; Kai Sun; Zhi-Dong Liu; Wen-Zhu Bi; Ying-Ya Xia; Hai-Tao Wu ..., Chemical Communication, 2015

A highly efficient one-pot strategy has been developed for the synthesis of β-ketophosphonates directly from alkynes and dialkyl H-phosphonates in the presence of widely available AgNO3/CuSO4 and K2S2O8 at room temperature under open-air conditions.

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Electrolytic Macrocyclizations: Scalable Synthesis of a Diazonamide‐Based Drug Development Candidate

26.02.2015 | Hui Ding, Patrick L. DeRoy, Christian Perreault, Alexandre Larivée, Arshad Siddiqui, Charles G. Caldwell, Susan Harr ..., Angewandte Chemie, 2015

Abstract An electrochemical method to synthesize the core macrolactam of diazonamides is described. Large ring‐forming dehydrogenation is initiated by anodic oxidation at a graphite surface. The reaction requires no tailoring of the substrate and occurs at ambient temperature in aqueous DMF in ...

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Synthesis of PEG-supported organotrifluoroborates and their applications in palladium-catalyzed homo-coupling reactions

26.02.2015 | Li Yong; Min-Liang Yao; David W. Blevins; George W. Kabalka, Dalton Transactions, 2015

A general synthetic route to water-soluble PEG-supported organotrifluoroborates has been developed. In the presence of air and catalytic amounts of Pd(OAc)2, the PEG-supported organotrifluoroborates undergo homo-coupling reactions smoothly at room temperature. No additional oxidizing agent, base, ...

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A new hypercrosslinked supermicroporous polymer, scope for sulfonation and its catalytic potential for the efficient synthesis of biodiesel at room temperature

26.02.2015 | Subhajit Bhunia; Biplab Banerjee; Asim Bhaumik, Chemical Communication, 2015

We have designed a new hypercrosslinked supermicroporous polymer (HMP-1) having BET surface area of 913 m2g-1 by FeCl3 catalyzed Friedel-Crafts alkylation reaction between carbazole and α,α′-Dibromo-p-xylene and upon sulfonation HMP-1 yielded a very efficient solid acid catalyst for the ...

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Copper catalyzed oxidative coupling reactions for trifluoromethylselenolations – synthesis of R-SeCF3 compounds using air stable tetramethylammonium trifluoromethylselenate

26.02.2015 | Quentin Lefebvre; Roman Pluta; Magnus Rueping, Chemical Communication, 2015

The aerobic, room-temperature coupling of tetramethylammonium trifluoromethylselenate with readily available boronic acids, boronic esters, and terminal alkynes has been developed. The method permits direct access to valuable trifluoromethylselenoarenes and alkynes under mild conditions. A ...

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Molecules, Vol. 20, Pages 3811-3820: An Efficient Synthesis of 3,4-Dihydropyrimidin-2(1H)-Ones and Thiones Catalyzed by a Novel Brønsted Acidic Ionic Liquid under Solvent-Free Conditions

26.02.2015 | Zhang, Yonghong ; Wang, Bin ; Zhang, Xiaomei ; Huang, Jianbin ; Liu, Chenjiang, Molecules, 2015

We report here an efficient and green method for Biginelli condensation reaction of aldehydes, β-ketoesters and urea or thiourea catalyzed by Brønsted acidic ionic liquid [Btto][p-TSA] under solvent-free conditions. Compared to the classical Biginelli reaction conditions, the present method has ...

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Chemical and Structural Evolution in the Th–SeO32–/SeO42– System: from Simple Selenites to Cluster-Based Selenate Compounds

26.02.2015 | Bin Xiao; Eike Langer; Jakob Dellen; Hartmut Schlenz; Dirk Bosbach; Evgeny V. Suleimanov; Evgeny V. Alekseev, Inorganic Chemistry, 2015

While extensive success has been gained in the structural chemistry of the U–Se system, the synthesis and characterization of Th-based Se structures are widely unexplored. Here, four new Th–Se compounds, α-Th(SeO3)2, β-Th(SeO3)2, Th(Se2O5)2, and Th3O2(OH)2(SeO4)3, have been obtained from mild ...

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