scholarly journals A Common Diaryl Ether Intermediate for the Gram-Scale Synthesis of Oxazine and Xanthene Fluorophores

2012 ◽  
Vol 52 (2) ◽  
pp. 650-654 ◽  
Author(s):  
Andrew V. Anzalone ◽  
Tracy Y. Wang ◽  
Zhixing Chen ◽  
Virginia W. Cornish
Keyword(s):  
Diaryl Ether

Synthesis and Biological Evaluation of Diaryl Ether Linked DC-81 Conjugates as Potential Antitumor Agents

2013 ◽  
Vol 13 (10) ◽  
pp. 1590-1600 ◽  
Author(s):  
Ahmed Kamal ◽  
A. Viswanath ◽  
M. Ramaiah ◽  
J. Murty ◽  
Farheen Sultana ◽  
...  
Keyword(s):  
Antitumor Agents ◽  
Biological Evaluation ◽  
Diaryl Ether ◽  
Synthesis And Biological Evaluation ◽  
Potential Antitumor

scholarly journals Metal-free formal synthesis of phenoxazine

2018 ◽  
Vol 14 ◽  
pp. 1491-1497 ◽  
Author(s):  
Gabriella Kervefors ◽  
Antonia Becker ◽  
Chandan Dey ◽  
Berit Olofsson
Keyword(s):  
Reaction Time ◽  
Transition Metal ◽  
Formal Synthesis ◽  
Metal Free ◽  
Diaryl Ether ◽  
Diaryliodonium Salt ◽  
Moderate Yield ◽  
Stable Iodine

A transition metal-free formal synthesis of phenoxazine is presented. The key step of the sequence is a high-yielding O-arylation of a phenol with an unsymmetrical diaryliodonium salt to provide an ortho-disubstituted diaryl ether. This species was cyclized to acetylphenoxazine in moderate yield. The overall yield in the three-step sequence is 72% based on recovered diaryl ether. An interesting, unusually stable iodine(III) intermediate in the O-arylation was observed by NMR and could be converted to the product upon longer reaction time.

ChemInform Abstract: Ligand-Free, Highly Efficient Synthesis of Diaryl Ether over Copper Fluorapatite as Heterogeneous Reusable Catalyst.

ChemInform ◽  
2012 ◽  
Vol 43 (28) ◽  
pp. no-no
Author(s):  
Shafeek A. R. Mulla ◽  
Suleman M. Inamdar ◽  
Mohsinkhan Y. Pathan ◽  
Santosh S. Chavan
Keyword(s):  
Reusable Catalyst ◽  
Efficient Synthesis ◽  
Highly Efficient ◽  
Diaryl Ether ◽  
Ligand Free

ChemInform Abstract: Diaryl Ether Synthesis in Supercritical Carbon Dioxide in Batch and Continuous Flow Modes.

ChemInform ◽  
2009 ◽  
Vol 40 (8) ◽  
Author(s):  
Jin-Kyun Lee ◽  
Matthew J. Fuchter ◽  
Rachel M. Williamson ◽  
Gary A. Leeke ◽  
Edward J. Bush ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Continuous Flow ◽  
Diaryl Ether ◽  
Ether Synthesis ◽  
Supercritical Carbon

Transition-Metal-Catalyzed Transformation of Sulfonates via S–O Bond Cleavage: Synthesis of Alkyl Aryl Ether and Diaryl Ether

2019 ◽  
Vol 21 (22) ◽  
pp. 8879-8883 ◽  
Author(s):  
Xuemeng Chen ◽  
Xue Xiao ◽  
Haotian Sun ◽  
Yue Li ◽  
Haolin Cao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Bond Cleavage ◽  
Aryl Ether ◽  
Alkyl Aryl ◽  
Diaryl Ether ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed

Structural characterization of milled wood lignins from different eucalypt species

Holzforschung ◽  
2008 ◽  
Vol 62 (5) ◽  
Author(s):  
Jorge Rencoret ◽  
Gisela Marques ◽  
Ana Gutiérrez ◽  
David Ibarra ◽  
Jiebing Li ◽  
...  
Keyword(s):  
Eucalyptus Globulus ◽  
Chemical Structure ◽  
2D Nmr ◽  
Analytical Pyrolysis ◽  
Additional Information ◽  
Diaryl Ether ◽  
Heteronuclear Single Quantum Correlation ◽  
Relative Abundances ◽  
Type 3

Abstract The chemical structure of milled-wood lignins from Eucalyptus globulus, E. nitens, E. maidenii, E. grandis, and E. dunnii was investigated. The lignins were characterized by analytical pyrolysis, thioacidolysis, and 2D-NMR that confirmed the predominance of syringyl over guaiacyl units and only showed traces of p-hydroxyphenyl units. E. globulus lignin had the highest syringyl content. The heteronuclear single quantum correlation (HSQC) NMR spectra yielded information about relative abundances of inter-unit linkages in the whole polymer. All the lignins showed a predominance of β-O-4′ ether linkages (66–72% of total side-chains), followed by β-β′ resinol-type linkages (16–19%) and lower amounts of β-5′ phenylcoumaran-type (3–7%) and β-1′ spirodienone-type linkages (1–4%). The analysis of desulfurated thioacidolysis dimers provided additional information on the relative abundances of the various carbon-carbon and diaryl ether bonds, and the type of units (syringyl or guaiacyl) involved in each of the above linkage types. Interestingly, 93–94% of the total β-β′ dimers included two syringyl units indicating that most of the β-β′ substructures identified in the HSQC spectra were of the syringaresinol type. Moreover, three isomers of a major trimeric compound were found which were tentatively identified as arising from a β-β′ syringaresinol substructure attached to a guaiacyl unit through a 4-O-5′ linkage.

Synthesis of a cyclic diaryl ether derivative under solid-phase conditions

2001 ◽  
Vol 42 (36) ◽  
pp. 6311-6313 ◽  
Author(s):  
Kazuhiko Nakamura ◽  
Hisa Nishiya ◽  
Shigeru Nishiyama
Keyword(s):  
Solid Phase ◽  
Ether Derivative ◽  
Diaryl Ether

Ligand free copper(i)-catalyzed synthesis of diaryl ether with Cs2CO3via a free radical path

2015 ◽  
Vol 44 (27) ◽  
pp. 12086-12090 ◽  
Author(s):  
Hong-Jie Chen ◽  
Mei-Chun Tseng ◽  
I-Jui Hsu ◽  
Wei-Ting Chen ◽  
Chien-Chung Han ◽  
...  
Keyword(s):  
Free Radical ◽  
Catalytic Reaction ◽  
Coupling Reaction ◽  
Reaction Conditions ◽  
Esi Ms ◽  
Ms Analysis ◽  
Diaryl Ether ◽  
Ligand Free

Complexes [Cu(i)(2,4-dimethylphenoxy)2]− (A) and [Cu(ii)(2,4-dimethylphenoxy)2(p-tolyl)]− (B) were observed by in situ ESI-MS analysis of the ligand free copper(i)-catalyzed C–O coupling reaction using Cs2CO3 under the catalytic reaction conditions.

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