Results 11 to 20 of about 9,771 (260)
Direct Synthesis of Bicyclic Acetals via Visible Light Catalysis
iScience, 2020 Summary: Polysubstituted bicyclic acetals are a class of privileged pharmacophores with a unique 3D structure and an adjacent pair of hydrogen bond acceptors.
Fengjin Wu +7 more
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Modeling of Living Cationic Ring-Opening Polymerization of Cyclic Ethers: Active Chain End versus Activated Monomer Mechanism [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2020 Living cationic ring-opening polymerization of cyclic ethers in the presence of diol was modeled using the method of moments. A widespread kinetic model was developed based on previous experimental studies.
Mehdi Mahmoudian +5 more
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CHIMIA, 1975 For the preparation of polyesters an ionically initiated ring-opening copolymerization reaction of dicarboxylic acid anhydrides and cyclic ethers can be used beside the conventional polycondensation technique. The main advantage of this copolymerization
Karl-Heinz W. Reichert
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Synthesis and desulfurization-decarboxylation of cyclic thionocarbonates of glycerol 1-ethers
Journal of Lipid Research, 1969 A method is described for the synthesis of cyclic thionocarbonates of 1-O-alkyl glycerols in quantitative yield. These derivatives of glycerol ethers can be quantitated by UV absorbance, analyzed by gas-liquid chromatography, or quantitatively converted ...
S. Ramachandran +2 more
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Investigation of the stability of azacrown complexes with some transition metal ions [PDF]
مجله علوم و فنون هستهای, 2020 The separation of metal ions from nuclear waste is an important issue in the nuclear industry. Cyclic chemical compounds including ether groups are called crown ethers. These compounds strongly bind to certain cations, forming complexes.
M. Arabieh +3 more
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Crystals, 2017 The electrostatic potential near to the oxygen atom in each of the cyclic ethers 2,5-dihydrofuran, oxetane and oxirane has been calculated by using a distributed multipole analysis (DMA) of each molecule. The electrostatic potential energy V(φ) of a unit
J. Grant Hill, Anthony C. Legon
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NIPPON KAGAKU KAISHI, 2002 フッ素含有率の高いヘキサフルオロプロピレンオキシド(HFPO)と環状エーテルとの反応による重合について検討を行った．モノマーとして六員環エーテルであるテトラヒドロピラン(THP)を用いたときには，重合体は得られなかった．四員環エーテルであるオキセタン，および三員環エーテルであるプロピレンオキシド(PO)をモノマーとして用いたときに重合生成物が得られた． モノマーとしてオキセタンを用いたときに，最も高分子量の重合体を得ることができ，その数平均分子量は4.8 × 103であった．これは，オキセタンの開環重合反応性が，環状エーテルの中で最も高いためであると考えられる． モノマーとしてプロピレンオキシド(PO)を用いたときに得られる重合生成物は ...
Yasuyuki MASUBUCHI +4 more
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The hydrolysis of geminal ethers: a kinetic appraisal of orthoesters and ketals
Beilstein Journal of Organic Chemistry, 2016 A novel approach to protecting jet fuel against the effects of water contamination is predicated upon the coupling of the rapid hydrolysis reactions of lipophilic cyclic geminal ethers, with the concomitant production of a hydrophilic acyclic ...
Sonia L. Repetto +4 more
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International Journal of Electrochemical Science, 2009 The electrochemical oxidation of catechol (H2Q) (1) has been studied in the absence and presence of 1,10.diaza-18-crown-6 (DA18C6) (2a), 1,7-diaza-15-crown-5 (DA15C5) (2b) and aza-15-crown-5 (A15C5) (2c) and also, in the presence of some transition metal
Davood Nematollahi +1 more
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Giant, 2023 ABAC-type periodic poly(cyclic acetal)s were synthesized via a two-step method consisting of the synthesis of a sequence-programmed cyclic trimers from one vinyl monomer and two bifunctional aldehydes (isophthalaldehyde or terephthalaldehyde) and the ...
Tadashi Naito +2 more
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