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2.160 Aktuelle Fachpublikationen zum Thema temperature

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SELECTIVE ETHERIFICATION OF [small beta]-CITRONELLENE CATALYZED BY ZEOLITE BETA

04.03.2015 | Sambhu Radhakrishnan; Martin Purino; Konstantinos Alexopoulos; Francis Taulelle; Marie-Francoise Reyniers; Guy B. Ma ..., Green Chemistry, 2015

The etherification of β-citronellene with bioalcohols over zeolite beta was investigated using a heterogeneous catalytic process in liquid phase at an optimum temperature of 80°C. The catalyst exhibits conversions close to 50% for β-citronellene and high selectivity for the etherification ...

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Catalytic hydrogen production from paraformaldehyde and water using an organoiridium complex

28.02.2015 | Tomoyoshi Suenobu; Yusuke Isaka; Satoshi Shibata; Shunichi Fukuzumi, Chemical Communication, 2015

Paraformaldehyde was decomposed using an organoiridium complex (1, [IrIII(Cp*)(4-(1H-pyrazol-1-yl-κN2)benzoic acid-κC3)(H2O)]2SO4) as a catalyst in water to produce H2 and CO2 in a 2 [ ] : [ ] 1 molar ratio at room temperature. The catalytic cycle is composed of the reduction of 1 by ...

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Natural Phosphate-supported Palladium: A Highly Efficient and Recyclable Catalyst for the Suzuki-Miyaura Coupling Under Microwave Irradiation

28.02.2015 | Hassine, Ayoub; Bouhrara, Mohamed; Sebti, Said; Solhy, Abderrahim; Mahfouz, Remi; Luart, Denis; Len, Christophe; Fih ..., Organic Chemistry, 2015

Abstract: This report explores Suzuki-Miyaura coupling under microwave irradiation, using a new generation of catalyst that is based on natural phosphate (NP) impregnated by palladium. This catalyst was prepared by the treatment of natural phosphate with bis(benzonitrile)palladium(II) ...

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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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Redox Tuning of a Direct Asymmetric Aldol Reaction

27.02.2015 | Qiying Zhang, Xiuling Cui, Long Zhang, Sanzhong Luo, Hui Wang, Yangjie Wu, Angewandte Chemie International Edition, 2015

Abstract Presented herein is a redox tuning strategy for asymmetric aminocatalysis with a designed chiral ferrocenophane. Under redox control, the ferrocenophane catalyst efficiently catalyzes the asymmetric aldol reaction at room temperature with excellent yield and good stereoselectivity. ...

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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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Mild Deoxygenation of Aromatic Ketones and Aldehydes over Pd/C Using Polymethylhydrosiloxane as the Reducing Agent

26.02.2015 | Alexey Volkov, Karl P. J. Gustafson, Cheuk‐Wai Tai, Oscar Verho, Jan‐E. Bäckvall, Hans Adolfsson, Angewandte Chemie International Edition, 2015

Abstract Herein, a practical and mild method for the deoxygenation of a wide range of benzylic aldehydes and ketones is described, which utilizes heterogeneous Pd/C as the catalyst together with the green hydride source, polymethylhydrosiloxane. The developed catalytic protocol is scalable and ...

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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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Pd(OAc)2 and (DHQD)2PHAL as simple, efficient and recyclable/reusable catalyst system for Suzuki–Miyaura cross–coupling reactions in H2O at room temperature

25.02.2015 | Bishwajit Saikia; Abdul Aziz Ali; Preeti Rekha Boruah; Diganta Sarma; Nabin Chandra Barua, New Journal of Chemistry, 2015

Suzuki–Miyaura cross–coupling reaction catalyzed by Pd(OAc)2 and (DHQD)2PHAL is a very simple, mild and efficient protocol for the synthesis of biaryls/heterobiaryls in neat H2O at room temperature. Coupling of different substituted aryl/heteroaryl halides with different aryl boronic acids was ...

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One-pot multicomponent synthesis of highly functionalized bio-active pyrano[2,3-c]pyrazole and benzylpyrazolyl coumarin derivatives using ZrO2 nanoparticles as reusable catalyst

25.02.2015 | Subhash Banerjee; Arijit Saha; Soumen Payra, Green Chemistry, 2015

A facile one-pot multicomponent protocol for the synthesis of bio-active pyrano[2,3-c]pyrazole and benzylpyrazolyl coumarin derivatives has been demonstrated using ZrO2 nanoparticles as catalyst at room temperature. The reactions are very fast and high yielding. The catalytic activity and ...

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