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60,467 Newest Publications about the topic addition

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Uracil-bearing poly(2-isopropyl-2-oxazoline): Hg(II)-selective control of its thermoresponsiveness

19-Jan-2018 | Jaehyuk Nam; Yongseok Jung; Woo-Dong Jang, Chemical Communication, 2018

A poly(2-isopropyl-2-oxazoline)-containing mercury ion (Hg2+)-responsive uracil moiety (U-PiPOx-U) was synthesized and it exhibited thermoresponsiveness in its aqueous solution. The changes in the UV-Vis absorption and thermoresponsiveness of U-PiPOx-U upon the addition of Hg2+ were studied. ...

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Defect-free network formation and swelling behavior in ionic liquid-based electrolytes of tetra-arm polymers synthesized using a Michael addition reaction

19-Jan-2018 | Mari Yoshitake; Yuji Kamiyama; Kengo Nishi; Nobuko Yoshimoto; Masayuki Morita; Takamasa Sakai; Kenta Fujii, Physical Chemistry Chemical Physics, 2018

The gelation mechanism of tetra-arm poly(ethylene glycol) (TetraPEG) prepolymers via a Michael addition reaction was investigated from the viewpoint of chemical reaction kinetics. The polymer network was formed by mixing two different TetraPEGs functionalized with maleimide and thiol terminal ...

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A Stereoselective Thiocyanate Conjugate Addition to Electron Deficient Alkynes and Concomitant Cyclization to N, S-Heterocycles

19-Jan-2018 | Vikas Dwivedi; Manda Rajesh; Ravi Kumar; Ruchir Kant; Maddi Sridhar Reddy, Chemical Communication, 2018

A regio- and stereoselective thiocyanate addition to ynones is achieved using KSCN in AcOH at 70 °C. The reaction is extendable to ynals, ynesulfones, ynoic acids and ynoates. Adducts from ynones were readily transformed into thiazine-2-thione derivatives under slightly modified reaction ...

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A facile and green synthesis of MIL-100(Fe) with high-yield and its catalytic performance

19-Jan-2018 | Le Han; Hui Qi; Dan Zhang; Gan Ye; Wei Zhou; Changmin Hou; Wei Xu; Yinyong Sun, New Journal of Chemistry, 2018

MIL-100(Fe) is one of the important metal–organic frameworks due to its fascinating physicochemical properties. Generally, MIL-100(Fe) was synthesized under the conditions of adding HF and solvent. Here, we report that MIL-100(Fe) can be facilely synthesized without the addition of solvent and ...

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Sydnone–alkyne cycloaddition: applications in synthesis and bioconjugation

19-Jan-2018 | Elodie Decuypère; Lucie Plougastel; Davide Audisio; Frédéric Taran, Chemical Communication, 2018

Sydnones are among the most popular mesoionic compounds studied so far for cycloaddition reactions. However, despite their good chemical stability and versatility, only a limited number of research groups have worked on their chemistry and use in organic synthesis. This feature article aims at ...

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Mutual interference of Cu and Zn ions in Alzheimer's disease: perspectives at the molecular level

19-Jan-2018 | Elena Atrián-Blasco; Amandine Conte-Daban; Christelle Hureau, Dalton Transactions, 2018

While metal ions such as copper and zinc are essential in biology, they are also linked to several amyloid-related diseases, including Alzheimer's disease (AD). Zinc and copper can indeed modify the aggregation pathways of the amyloid-β (Aβ) peptide, the key component encountered in AD. In ...

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Photosensitised regioselective [2+2]-cycloaddition of cinnamates and related alkenes

18-Jan-2018 | Santosh K. Pagire; Asik Hossain; Lukas Traub; Sabine Kerres; Oliver Reiser, Chemical Communication, 2018

An efficient method for the synthesis of substituted cyclobutanes from cinnamates, chalcones, and styrenes has been developed utilizing a visible-light triplet sensitisation mode. This reaction provides a diverse range of substituted cyclobutanes in high yields under mild conditions without the ...

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Hexafluoroisopropanol mediated benign synthesis of 2H-pyrido[1,2-a]pyrimidin-2-ones by using a domino protocol

18-Jan-2018 | Zakeyah Alsharif; Mohamad Akbar Ali; Hessa Alkhattabi; Derika Jones; Evan Delancey; P. C. Ravikumar; Mohammad A. Alam, New Journal of Chemistry, 2018

A domino strategy has been used for the synthesis of 2H-pyrido[1,2-a]pyrimidin-2-ones. Four sequential reactions: aza-Michael addition, water elimination, intramolecular acyl substitution, and [1,3]-H shift were observed in this domino protocol. Hexafluoroisopropanol is used as a promotor and ...

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A green and efficient method for the synthesis of pyrroles using a deep eutectic solvent ([CholineCl][ZnCl2]3) under solvent-free sonication.

18-Jan-2018 | Hai Truong Nguyen; Duy-Khiem Nguyen Chau; Phuong Hoang Tran, New Journal of Chemistry, 2018

An efficient deep eutectic solvent-based synthesis of pyrroles under ultrasound irradiation has been developed to provide a significant improvement of the yield up to 99% in a short reaction time. The synthesis of pyrroles is highly atom-economical, producing water as the sole byproduct. In ...

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Metal-free diastereoselective construction of bridged ketal spirooxindoles via a Michael addition-inspired sequence

18-Jan-2018 | Yanshuo Zhu; Jing Zhou; Shaojing Jin; Huahui Dong; Jiaomei Guo; Xuguan Bai; Qilin Wang; Zhanwei Bu, Chemical Communication, 2018

A TfOH-catalyzed highly diastereoselective Michael addition/ketalization sequence of 3-hydroxyoxindoles and ortho-hydroxychalcones was developed, leading to biologically important bridged ketal spirooxindoles in moderate to excellent yields. Moreover, some chemical transformations were carried ...

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