نتایج جستجو برای: ally aryl ether

تعداد نتایج: 38019  

2016
Jose Henrique Pereira Richard A. Heins Daniel L. Gall Ryan P. McAndrew Kai Deng Keefe C. Holland Timothy J. Donohue Daniel R. Noguera Blake A. Simmons Kenneth L. Sale John Ralph Paul D. Adams

There has been great progress in the development of technology for the conversion of lignocellulosic biomass to sugars and subsequent fermentation to fuels. However, plant lignin remains an untapped source of materials for production of fuels or high value chemicals. Biological cleavage of lignin has been well characterized in fungi, in which enzymes that create free radical intermediates are u...

Journal: :Organic & biomolecular chemistry 2011
Kokkirala Swapna Sabbavarapu Narayana Murthy Mocharla Tarani Jyothi Yadavalli Venkata Durga Nageswar

An efficient alumina-supported CuO-catalyzed O-arylation of phenols and aliphatic alcohols with various aryl as well as heteroaryl halides under ligand-free conditions are reported. This protocol provides a variety of diaryl ether and bis-diaryl ether motifs by reacting different aryl/aliphatic halides with differently substituted phenols and saturated alcohols in the presence of a catalytic am...

2014
W. Marek Gołębiewski Monika Cyrta Maria Krawczyk

Several ether and ester derivatives of aryl aldoximes have been synthesized from the aryl aldehydes. Structures of all new products were established by spectral methods. Many of the obtained compounds showed higher activity against fungal pathogens Botrytis cinerea, Fusarium culmorum, Phytophthora cactorum, and Rhizoctonia solani than the reference substance chlorothalonil, reaching 100% inhibi...

Journal: :The Journal of organic chemistry 2004
Shanthaveerappa K Boovanahalli Dong Wook Kim Dae Yoon Chi

We have used the high nucleophilicity of bromide ion in the form of the ionic liquid, 1-n-butyl-3-methylimidazolium bromide ([bmim][Br]), for the nucleophilic displacement of an alkyl group to regenerate a phenol from the corresponding aryl alkyl ether. Using 2-methoxynaphthalene (1) as a model compound, we found that the combination of ionic liquid [bmim][Br] and p-toluenesulfonic acid with wa...

Journal: :Organic & biomolecular chemistry 2008
Gopal K Datta Mats Larhed

Highly stereoselective chelation-controlled Pd(0)-catalyzed beta-arylations and beta-vinylations of a five-membered chiral, pyrrolidine-based vinyl ether were achieved using aryl- and vinyl chlorides as substrates, yielding quaternary 2-aryl/vinyl-2-methyl cyclopentanones in 89-96% ee under neutral reaction conditions.

Journal: :Organic letters 2005
Xiao-jun Wang Li Zhang Xiufeng Sun Yibo Xu Dhileepkumar Krishnamurthy Chris H Senanayake

[chemical reaction: see text]. Direct addition of Grignard reagents to acid chlorides in the presence of bis[2-(N,N-dimethylamino)ethyl] ether proceeds selectively to provide aryl ketones in high yields. A possible tridentate interaction between Grignard reagents and bis[2-(N,N-dimethylamino)ethyl] ether moderates the reactivity of Grignard reagents, preventing the newly formed ketones from nuc...

2015
Talon M Kosak Heidi A Conrad Andrew L Korich Richard L Lord

One of the most well-known, highly utilized reagents for ether cleavage is boron tribromide (BBr3), and this reagent is frequently employed in a 1:1 stoichiometric ratio with ethers. Density functional theory calculations predict a new mechanistic pathway involving charged intermediates for ether cleavage in aryl methyl ethers. Moreover, these calculations predict that one equivalent of BBr3 ca...

Journal: :Communications, Faculty Of Science, University of Ankara Series B Chemistry and Chemical Engineering 1969

Journal: :Journal of the American Chemical Society 2012
Paul Kelley Sibo Lin Guy Edouard Michael W Day Theodor Agapie

Mechanistic studies of the hydrogenolysis of aryl ethers by nickel were undertaken with (diphosphine)aryl methyl ethers. A Ni(0) complex containing Ni-arene interactions adjacent to the aryl-O bond was isolated. Heating led to aryl-O bond activation and generation of a nickel aryl methoxide complex. Formal β-H elimination from this species produced a nickel aryl hydride which can undergo reduct...

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