Results 21 to 30 of about 12,704 (308)

Lewis Acid Mediated Cyclizations: Diastereoselective Synthesis of Six- to Eight-Membered Substituted Cyclic Ethers [PDF]

, 2017
Cyclic ethers are widely abundant in natural products. Cyclic ether templates are also utilized in drug design and medicinal chemistry. Although the synthetic processes for this class of compounds have been studied extensively with respect to five- and ...
Arun Ghosh, Kelsey Cantwell, Anthony Tomaine   +2 more
core   +1 more source

Electrostatic Potential and a Simple Extended Electric Dipole Model of Hydrogen Fluoride as Probes of Non-Bonding Electron Pairs in the Cyclic Ethers 2,5-Dihydrofuran, Oxetane and Oxirane

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
doaj   +1 more source

Heterocyclic Crown Ethers with Potential Biological and Pharmacological Properties: From Synthesis to Applications

Applied Sciences, 2022
Cyclic organic compounds with several ether linkages in their structure are of much concern in our daily life applications. Crown ethers (CEs) are generally heterocyclic and extremely versatile compounds exhibiting higher binding affinity.
Faiz Ullah, Taskin Aman Khan, Jawaria Iltaf, Saleha Anwar, Muhammad Farhan Ali Khan, Muhammad Rizwan Khan, Sami Ullah, Muhammad Fayyaz ur Rehman, Muhammad Mustaqeem, Katarzyna Kotwica-Mojzych, Mariusz Mojzych   +10 more
doaj   +1 more source

Ring-opening polymerization

Chemistry Teacher International, 2021
Ring-opening polymerization is defined by IUPAC (Penczek, S., Moad, G. (2008). Glossary of the terms related to kinetics, thermodynamics, and mechanisms of polymerization.
Penczek Stanislaw, Pretula Julia, Slomkowski Stanislaw   +2 more
doaj   +1 more source

Polymerization of Cyclic Ethers Initiated by the Reaction of Cyclic Ether with Hexafluoropropylene Oxide.

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, Tokio HAGIWARA, Youichi IKEGAYA, Seiji KAWATA, Noriyuki YONEZAWA   +4 more
openaire   +2 more sources

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, James F. Costello, Craig P. Butts, Joseph K. W. Lam, Norman M. Ratcliffe   +4 more
doaj   +1 more source

Electrochemical Oxidation of Catechol in the Presence of some Azacrown Ethers and Transition Metal Ions in Acetonitrile

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, Leila Mohammadi-Behzad   +1 more
doaj   +1 more source

Thermochemistry of Solution, Solvation and Hydrogen Bonding of Chloroform in Linear and Cyclic Ethers [PDF]

, 2021
In this work the thermochemistry of solution, solvation and hydrogen bond formation of chloroform in linear and cyclic ethers was studied. The infinite dilution solution enthalpies of chloroform in diethyl ether, diglyme, 1,4-dioxane, tetrahydrofuran, 12-
Semenov K.N., Petrov A.A., Akhmadiyarov A.A., Rakipov I.T., Khachatrian A.A., Fakhurtdinova A.R., Solomonov B.N.   +6 more
core  

Addition to Electron Deficient Olefins of α-Oxy Carbon- Centered Radicals, Generated from Cyclic Ethers and Acetals by the Reaction with Alkylperoxy- λ3-iodane

Molecules, 2005
Thermal decomposition of 1-tert-butylperoxy-1,2-benziodoxol-3(1H)-one in cyclic ethers and acetals at 50 °C generates α-oxy carbon-centered radicals, which undergo an addition reaction with vinyl sulfones and unsaturated esters.
M. Ochiai, T. Suefuji, Y. Takeuchi, T. Sueda   +3 more
doaj   +1 more source

pH-Responsive Hollow Polymeric Microspheres from Irradiated Cyclic Ether Aqueous Solution

Applied Sciences, 2021
Smart hollow polymeric microspheres have been widely applied in various fields such as controlled release, drug delivery, catalysis, and so on. Herein, a facile, green and one-step template-free method is introduced for preparing pH-responsive hollow ...
Chuhong Yu, Jing Peng, Jiuqiang Li, Maolin Zhai   +3 more
doaj   +1 more source