A bench-stable low-molecular-weight vinyl azide surrogate for a cascade reaction: facile access to novel N-vinyl-1,2,3-triazoles

2020 ◽  
Vol 7 (18) ◽  
pp. 2628-2633
Author(s):  
Zhenhua Liu ◽  
Lianxiao Wang ◽  
Tian Yu ◽  
Yanan Sun ◽  
Huimin Chen ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Functional Groups ◽  
Cascade Reaction ◽  
Low Molecular Weight ◽  
Efficient Access ◽  
Metal Catalyzed

A novel metal-catalyzed cascade reaction of stable low-molecular-weight vinyl azide surrogate with S-/O-nucleophiles and alkynes was disclosed in a general fashion, thus providing mild and efficient access to various N-vinyl-1,2,3-triazoles bearing new functional groups.

Terpenes, Phenylpropanoids, Sulfur and Other Essential Oil Constituents as Inhibitors of Cholinesterases

2020 ◽  
Vol 27 (26) ◽  
pp. 4297-4343 ◽  
Author(s):  
Franko Burčul ◽  
Ivica Blažević ◽  
Mila Radan ◽  
Olivera Politeo
Keyword(s):  
Molecular Weight ◽  
Biological Activity ◽  
Essential Oils ◽  
Functional Groups ◽  
Organic Compounds ◽  
Chemical Structure ◽  
Low Molecular Weight ◽  
Active Compounds ◽  
Oxygenated Compounds ◽  
Nitrogen Containing Compounds

: Essential oils constituents are a diverse family of low molecular weight organic compounds with comprehensive biological activity. According to their chemical structure, these active compounds can be divided into four major groups: terpenes, terpenoids, phenylpropenes, and "others". In addition, they may contain diverse functional groups according to which they can be classified as hydrocarbons (monoterpenes, sesquiterpenes, and aliphatic hydrocarbons); oxygenated compounds (monoterpene and sesquiterpene alcohols, aldehydes, ketones, esters, and other oxygenated compounds); and sulfur and/or nitrogen containing compounds (thioesters, sulfides, isothiocyanates, nitriles, and others). : Compounds that act as cholinesterase inhibitors still represent the only pharmacological treatment of Alzheimer´s disease. Numerous in vitro studies showed that some compounds, found in essential oils, have a promising cholinesterase inhibitory activity, such as α-pinene, δ-3-carene, 1,8-cineole, carvacrol, thymohydroquinone, α- and β-asarone, anethole, etc. : Essential oils constituents are a diverse family of low molecular weight organic compounds with comprehensive biological activity. According to their chemical structure, these active compounds can be divided into four major groups: terpenes, terpenoids, phenylpropenes, and "others". In addition, they may contain diverse functional groups according to which they can be classified as hydrocarbons (monoterpenes, sesquiterpenes, and aliphatic hydrocarbons); oxygenated compounds (monoterpene and sesquiterpene alcohols, aldehydes, ketones, esters, and other oxygenated compounds); and sulfur and/or nitrogen containing compounds (thioesters, sulfides, isothiocyanates, nitriles, and others).

In VitroAntioxidant Activities of Low-Molecular-Weight Polysaccharides with Various Functional Groups

2009 ◽  
Vol 57 (7) ◽  
pp. 2699-2704 ◽  
Author(s):  
Szu Kai Chen ◽  
Min Lang Tsai ◽  
Jin Ru Huang ◽  
Rong Huei Chen
Keyword(s):  
Molecular Weight ◽  
Functional Groups ◽  
Low Molecular Weight

scholarly journals Inhibition of Oxidative Stress by Low-Molecular-Weight Polysaccharides with Various Functional Groups in Skin Fibroblasts

2013 ◽  
Vol 14 (10) ◽  
pp. 19399-19415 ◽  
Author(s):  
Szu-Kai Chen ◽  
Chu-Hsi Hsu ◽  
Min-Lang Tsai ◽  
Rong-Huei Chen ◽  
Gregor Drummen
Keyword(s):  
Oxidative Stress ◽  
Molecular Weight ◽  
Functional Groups ◽  
Skin Fibroblasts ◽  
Low Molecular Weight

Low-molecular-weight styrene–butadiene copolymers (L-SSBR) as processing aids used for silica-filled rubber: Synthesis, functionalization and application

2018 ◽  
Vol 51 (3) ◽  
pp. 244-261
Author(s):  
Barbara Robak ◽  
Jarosław Rogoża ◽  
Mieczysław Łapkowski
Keyword(s):  
Molecular Weight ◽  
Functional Groups ◽  
Gel Permeation Chromatography ◽  
Proton Nuclear Magnetic Resonance ◽  
Low Molecular Weight ◽  
Nuclear Magnetic Resonance Analysis ◽  
Resonance Analysis ◽  
Filled Rubber ◽  
Cure Characteristic ◽  
Styrene Butadiene

Three different types of low-molecular-weight solution styrene-butadiene rubbers (L-SSBRs) were synthesized by anionic polymerization. Two of them were end-capped with methoxy (M-L-SSBR) and ethoxy (E-L-SSBR) functional groups, respectively, while the other was terminated with alcohol (L-SSBR). The content of functional groups was estimated on the basis of gel permeation chromatography and proton nuclear magnetic resonance analysis. The influence of L-SSBR on the properties of silica-filled SSBR as an alternative for the plasticizing oil was investigated in tyre tread formulation. L-SSBRs of high vinyl content were used in place of part of oil for preparation of compound K1 enriched with linear (L-SSBR) and compound K2 and K3 enriched with two star-like liquid rubbers modified, respectively, with methoxy (M-L-SSBR) and ethoxy (E-L-SSBR) functional groups. Although particular attention was paid to the effect of polar groups on the silica dispersions, cure characteristic, compound viscosity and mechanical properties were also analyzed. Rubber with only treated distillate aromatic extract was used (K5) as the reference.

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