نتایج جستجو برای: glycol ethers

تعداد نتایج: 29872  

Journal: :Physical chemistry chemical physics : PCCP 2008
Bogdan C Ibănescu Michael Allan

A difference was observed in the reactivity of alcohols and ethers toward free electrons. Whereas the lowest core-excited state of the negative ion-a 2(n,3s2) Feshbach resonance-of the alcohols readily dissociates by losing a hydrogen atom, ethers show no observable signal from this resonance. This difference in reactivity has a parallel in the anomalous shapes and energies of the parent states...

Journal: :Topics in current chemistry 2012
Martin Kaller Sabine Laschat

In this chapter, a comprehensive review over the entire reserarch on liquid crystalline crown ethers since their discovery will be given. Monomeric and polymeric molecules containing crown ethers as well as aza crown ethers, thia crown ethers and crown ethers with several different heteroatoms will be presented. Liquid crystallinity is, in most cases, caused by the substituents attached to the ...

Bita Mohtat Delaram Abdolahi,

7-hydroxy coumarin undergoes neutral conditions with alkyl propiolates in the presence of triphenylphosphine, and bysubstituation the corresponding aryl vinyl ethers was obtained in good yields

2017
Ryan DeAngelis Amy Solinski David A. Hunt

In a heretofore-unreported reaction, 1,2-cyclohexandione reacts with a variety of alcohols under mild acid-catalyzed dehydration conditions to afford not only ethers of 1,2cyclohexanedione but the corresponding aryl ethers as well in moderate to good yield.

Journal: :The Journal of organic chemistry 2004
Michael E Jung Andreas Maderna

We describe the first synthesis of homoallyl ethers from acetals and allyltrimethylsilane using microwave heating and CuBr as a promoter. This method works best for aromatic acetals, giving the corresponding homoallyl ethers in good to quantitative yield.

2014
Cheng-Chung Lee Manuel Maestre-Reyna Kai-Cheng Hsu Hao-Ching Wang Chia-I Liu Wen-Yih Jeng Li-Ling Lin Richard Wood Chia-Cheng Chou Jinn-Moon Yang Andrew H-J Wang

Crown ethers are small, cyclic polyethers that have found wide-spread use in phase-transfer catalysis and, to a certain degree, in protein chemistry. Crown ethers readily bind metallic and organic cations, including positively charged amino acid side chains. We elucidated the crystal structures of several protein-crown ether co-crystals grown in the presence of 18-crown-6. We then employed biop...

Journal: :Chemico-biological interactions 1987
J E Sinsheimer E Van den Eeckhout B H Hooberman V G Beylin

The Ames procedure with Salmonella typhimurium strain TA100 was used to follow the detoxication by rat liver fractions of two series of aliphatic epoxides. The epoxides employed were 3-chloro-, 3,3-dichloro- and 3,3,3-trichloropropylene oxides and also p-methoxyphenyl-, phenyl- and p-nitrophenylglycidyl ethers. In our procedure with preincubation of the epoxides with rat liver fractions prior t...

Journal: :transport phenomena in nano and micro scales 2014
s. akbarzadeh m. farhadi k. sedighi m. ebrahimi

in this paper, the measurement of the viscosity of zno in ethylene glycol, propylene glycol, mixture of ethylene glycol and water (60:40 by weight), and a mixture of propylene glycol and water (60:40 by weight) and the thermal conductivity in ethylene glycol and propylene glycol as base fluids in the range of temperature from 25 ºc to 60 ºc are investigated. the results indicate that as the tem...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2008
Kensuke Kurahashi Shigeo Umetani Yoshiki Sohrin

Novel 4-acyl-5-pyrazolones having aza-15-crown-5 (HPMP-A15C5) and aza-18-crown-6 (HPMP-A18C6) moieties as an intramolecular synergist have been synthesized by simple coupling reactions between 1-phenyl-3-methyl-4-chloroacetyl-5-pyrazolone and the corresponding azacrown ethers. The solvent extraction of the divalent metal ions (Mn(2+), Co(2+), Ni(2+), Cu(2+), Zn(2+), Cd(2+) and Pb(2+)) were exam...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید