Results 21 to 30 of about 478,322 (298)

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

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

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

Piers' borane-mediated hydrosilylation of epoxides and cyclic ethers

, 2018
We report the first diarylborane-catalysed hydrosilylation of epoxides and cyclic ethers. Mechanistic studies on the in situ generated Piers' borane (C6F5)2BH with hydrosilanes in the presence of an epoxide revealed that an alkyloxy(diaryl)borane (C6F5 ...
Sehoon Park, Sukbok Chang, Jianbo Zhang
core   +2 more sources

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

Lewis Acid-Initiated Ring-Opening Reactions of Five- and Six-Membered Cyclic Ethers Based on the Oxonium Ylide Intermediates

Organics
In light of the small ring strain of five/six-membered cyclic ethers, constructing complex molecules via ring-opening reactions has consistently been a highly challenging topic in organic synthesis.
Dandan Jiang, Jun Xiao, Yingzhen Zhang, Kunming Liu, Juanhua Li, Jinbiao Liu   +5 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

Occupational exposure to glycidyl ethers [PDF]

"Glycidyl ethers are characterized by the presence of a three-carbon chain with an epoxide group and an ether linkage. This recommended standard applies to monoglycidyl ethers and diglycidyl ethers that contain an alkyl group, an aromatic group, or a ...

core   +1 more source