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63.562 Aktuelle Fachpublikationen zum Thema Addition


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Asymmetric synthesis of functionalized tetrahydrofluorenones via an NHC-catalyzed homoenolate Michael addition

20.06.2018 | Dieter Enders; Tao Shu; Li Sun; Xiang-Yu Chen; Qiang Liu; Carolina von Essen; Kari Rissanen, Chemical Communication, 2018

The first example of an N-heterocyclic carbene-catalyzed asymmetric desymmetrization of enal-tethered cyclohexadienones via an intramolecular homoenolate Michael addition/esterification reaction is described. This new protocol offers a direct entry to various functionalized tetrahydrofluorenones ...


Rapid synthesis of polysubstituted phenanthridines from simple aliphatic/aromatic nitriles and iodo arenes via Pd(II) catalyzed domino C–C/C–C/C–N bond formation

20.06.2018 | Yogesh Jaiswal; Yogesh Kumar; Jagannath Pal; Ranga Subramanian; Amit Kumar, Chemical Communication, 2018

An efficient and straightforward method has been developed for the synthesis of polysubstituted phenanthridines from simple aryl iodides and alkyl/aryl nitriles via the palladium-catalyzed nucleophilic addition of aryl iodides to nitriles followed by cascade formation of C–C and C–N bonds viz. in ...


Sequential [3+2] cycloaddition and [5+n] annulation for modular synthesis of dihydrobenzoxazines, tetrahydrobenzoxazepines and tetrahydrobenzoxazocines

20.06.2018 | Alex Muthengi; Xiaofeng Zhang; Gagan Dhawan; Wensheng Zhang; Francesca Corsini; Wei Zhang, Green Chemistry, 2018

A two-step method for the [3+2] cycloaddition of azomethine ylides followed by a double SN2 substitution-based [5+n] annulation is introduced for the modular synthesis of dihydrobenzoxazine, tetrahydrobenzoxazepine and tetrahydrobenzoxazocine derivatives. After a quick water wash without further ...


Cycloaddition of CO2 to epoxides over a porous covalent triazine-based polymer incorporated with Fe3O4

20.06.2018 | Ravi - Seenu; Pillaiyar Puthiaraj; Dong-Wha Park; Wha-Seung Ahn, New Journal of Chemistry, 2018

Highly porous quaterphenyl-containing covalent triazine polymer (QP-CTP) incorporated with iron oxide nanoparticles (Fe3O4@QP-CTP) was synthesized and applied as a catalyst for cycloaddition of CO2 to epoxides under mild conditions. The synthesized materials were characterized using X-ray powder ...


Electrochemical sensing of attomolar miRNA combining cascade strand displacement polymerization and reductant-mediated amplification

20.06.2018 | Peng Miao; Yiting Jiang; Tian Zhang; Yue Huang; Yuguo Tang, Chemical Communication, 2018

Herein, we have developed a distinctive electrochemical sensing platform for miRNA assay. Target miRNA initiates two cycles of polymerization, nicking, and displacement reactions, which lead to the variation of the distance between redox molecules and the electrode surface. In addition, a ...


Novel 2-(hydroxy)-naphthyl imino functionalized pillar[5]arene: a highly efficient supramolecular sensor for tandem fluorescence detection of Fe3+ and F− and the facile separation of Fe3+

20.06.2018 | Wei Zhu; Hu Fang; Jun-Xia He; Wen-Hua Jia; Hong Yao; Tai-Bao Wei; Qi Lin; You-Ming Zhang, New Journal of Chemistry, 2018

A highly efficient supramolecular sensor based on 2-(hydroxy)-naphthyl imino-functionalized pillar[5]arene (AP5N) for the tandem fluorescence detection of Fe3+ and F− in H2O/DMSO (1/9, v/v) solution was successfully synthesized. On addition of Fe3+ to AP5N, the blue fluorescence was quenched. The ...


Carbonyl and Ester C-O Bond Hydrosilylation Using [small kappa]4-Diimine Nickel Catalysts

20.06.2018 | Christopher L. Rock; Thomas L Groy; Ryan J. Trovitch, Dalton Transactions, 2018

The synthesis of alkylphosphine-substituted α-diimine (DI) ligands and their subsequent addition to Ni(COD)2 allowed for the preparation of (iPr2PPrDI)Ni and (tBu2PPrDI)Ni. The solid state structures of both compounds were found to feature a distorted tetrahedral geometry that is largely ...


Solvent-Induced Structural Transformation and Magnetic Modulation in 1D Copper (II) Polymers Based on a Semi-rigid Ligand Containing 4-Amino-1,2,4-Triazole

20.06.2018 | Xiang-Wen Wu; Feng Pan; Shi Yin; Jing-Yuan Ge; Guo-Xia Jin; Peng Wang; Jian-ping Ma, CrystEngComm, 2018

One helical Cu(II) polymer 1 exhibits reversible SCSC transformation and magnetism switch by the chemisorption/desorption of MeCN molecules. Significant changes in the color, coordination environment, and magnetic behavior were found during the SCSC transformation. In addition, the effect of ...


Photochemical Conversion of a Cytidine Derivative to a Thymidine Analog via [2+2]-Cycloaddition

20.06.2018 | Xiaoxu Li; Ece Erturk; Xin Chen; Shiv Kumar; Cheng Guo; Steffen Jockusch; James J Russo; Timothy H. Bestor; Jingyue Ju, Photochemical & Photobiological Sciences, 2018

Epigenetic information is encoded in the mammalian genome in the form of cytosines methylated at the 5 position. While cytosine methylation has multiple biological effects, including gene regulation and silencing of integrated viral DNA, currently available methods for mapping methylation sites ...


Influence of land use on distribution of soil n-alkane δD and brGDGTs along an altitudinal transect in Ethiopia: Implications for (paleo)environmental studies

17.06.2018 | Author(s): Andrea Jaeschke, Janet Rethemeyer, Michael Lappé, Stefan Schouten, Pascal Boeckx, Enno Schefuß, Organic Geochemistry, 2018

Publication date: Available online 15 June 2018 Source:Organic Geochemistry Author(s): Andrea Jaeschke, Janet Rethemeyer, Michael Lappé, Stefan Schouten, Pascal Boeckx, Enno Schefuß The combined use of plant wax n-alkane δD values and branched glycerol dialkyl glycerol ...


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