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2.053 Aktuelle Fachpublikationen zum Thema temperature

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A Phthalimidation Protocol That Follows Protein Defined Parameters

19.11.2014 | Rohith Singudas; Srinivasa Rao Adusumalli; Pralhad Namdev Joshi; Vishal Rai, Chemical Communication, 2014

This work outlines the first phthalimidation protocol suitable for protein labeling and performed in aqueous medium at room temperature and neutral pH with no obligation of catalyst or co-reagent. The methodology is suitable for a range of amines and its efficiency was determined with ...

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The Paal–Knorr reaction revisited. A catalyst and solvent-free synthesis of underivatized and N-substituted pyrroles

18.11.2014 | Hyejin Cho; Richard Madden; Bilal Nisanci; Béla Török, Green Chemistry, 2014

A new, modified synthesis of pyrroles is described. The reaction of 2,5-hexandione with a variety of amines yielded the expected pyrrole analogues in excellent yields. The reactions were carried out under the ultimate green conditions excluding both catalyst and solvent applying simple stirring ...

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Temperature-responsive nanobiocatalysts with an upper critical solution temperature for high performance biotransformation and easy catalyst recycling: efficient hydrolysis of cellulose to glucose

18.11.2014 | Priscilia A. Limadinata; Aitao Li; Zhi Li, Green Chemistry, 2014

Development of immobilized enzyme for efficient biocatalysis and catalyst recycling is of great importance in cost-effective and green chemical synthesis, with the hydrolysis of cellulose to glucose for the utilization of lignocellulosic biomass as a prominent and challenging example. We ...

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Microwave assisted glycolysis of poly(ethylene terephthalate) catalyzed by 1‐butyl‐3‐methylimidazolium bromide ionic liquid

14.11.2014 | Mohamed A. Alnaqbi, Mahmoud A. Mohsin, Reneesh M. Busheer, Yousef Haik, Journal of Applied Polymer Science, 2014

ABSTRACT The combination of ionic liquid (IL) associated with microwave energy may have some potential application in the chemical recycling of poly (ethylene terephthalate). In this processes, glycolysis of waste poly (ethylene terephthalate) recovered from bottled water containers were ...

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n-BuLi as a Highly Efficient Precatalyst for Hydrophosphonylation of Aldehydes and Unactivated Ketones

14.11.2014 | Chengwei Liu; Yu Zhang; Qinqin Qian; Dan Yuan; Yingming Yao, Organic Letters, 2014

It was found for the first time that organic alkali metal compounds serve as highly efficient precatalysts for the hydrophosphonylation reactions of aldehydes and unactivated ketones with dialkyl phosphite under mild conditions. For ketone substrates, a reversible reaction was observed, and the ...

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Nanocrystalline Pt-CeO2 as an efficient catalyst for a room temperature selective reduction of nitroarenes

12.11.2014 | Astha Shukla; Rajib Kumar Singha; Takehiko Sasaki; Rajaram Bal, Green Chemistry, 2014

We have developed a new synthesis strategy to prepare Pt nanoparticles with size between 2 and 5 nm supported on CeO2 nanoparticles with size between 30 and 60 nm by the hydrothermal method in the presence of the surfactant cetyltrimethyl ammonium bromide (CTAB) and a polymer (PVP). It was found ...

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Ultrathin Cobalt–Manganese Layered Double Hydroxide Is an Efficient Oxygen Evolution Catalyst

12.11.2014 | Fang Song; Xile Hu, Journal of the American Chemical Society, 2014

Cost-effective production of solar fuels requires robust and earth-abundant oxygen evolution reaction (OER) catalysts. Herein, we report that ultrathin nanoplates of cobalt–manganese layered double hydroxide (CoMn LDH) are a highly active and stable oxygen evolution catalyst. The catalyst was ...

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Hydrogen Exposure Effects on Pt/Al2O3 Catalysts Coated with Thiolate Monolayers

11.11.2014 | April R. Corpuz; Simon H. Pang; Carolyn A. Schoenbaum; J. William Medlin, Langmuir, 2014

Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to examine the effect of thermal treatment of self-assembled monolayers (SAMs) produced from various thiols (1-hexanethiol, 1-decanethiol, 1-octadecanethiol, 1,6-hexanedithiol, 1,10-decanedithiol, 1,2-benzenedithiol) on ...

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An Efficient Nanoscale Heterogeneous Catalyst for the Capture and Conversion of Carbon Dioxide at Ambient Pressure

10.11.2014 | Xiao‐Huan Liu, Jian‐Gong Ma, Zheng Niu, Guang‐Ming Yang, Peng Cheng, Angewandte Chemie International Edition, 2014

Abstract Silver nanoparticles were successfully supported on the zeolite‐type metal–organic framework MIL‐101 to yield Ag@MIL‐101 by a simple liquid impregnation method. For the first time, the conversion of terminal alkynes into propiolic acids with CO2 was achieved by the use of the ...

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An Efficient Nanoscale Heterogeneous Catalyst for the Capture and Conversion of Carbon Dioxide at Ambient Pressure

10.11.2014 | Xiao‐Huan Liu, Jian‐Gong Ma, Zheng Niu, Guang‐Ming Yang, Peng Cheng, Angewandte Chemie, 2014

Abstract Silver nanoparticles were successfully supported on the zeolite‐type metal–organic framework MIL‐101 to yield Ag@MIL‐101 by a simple liquid impregnation method. For the first time, the conversion of terminal alkynes into propiolic acids with CO2 was achieved by the use of the ...

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