Rapid microwave-assisted cleavage of methyl phenyl ethers: new method for synthesizing desmethyl precursors and for removing protecting groups

2002 ◽  
Vol 45 (6) ◽  
pp. 529-538 ◽  
Author(s):  
Anna Fredriksson ◽  
Sharon Stone-Elander
Keyword(s):  
New Method ◽  
Protecting Groups ◽  
Microwave Assisted ◽  
Phenyl Ethers ◽  
Methyl Phenyl

Methylation of Phenolic Hydroxyl Group and Demethylation of Anisoles

2009 ◽  
Vol 2009 (4) ◽  
pp. 229-230 ◽  
Author(s):  
Nobuhiro Sato ◽  
Hiroyuki Endo
Keyword(s):  
Microwave Heating ◽  
Room Temperature ◽  
Reverse Reaction ◽  
Phenolic Hydroxyl ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Phenolic Hydroxyl Groups ◽  
Phenyl Ethers ◽  
Methyl Phenyl

A mild methylation of phenolic hydroxyl groups with iodomethane was enabled in the presence of sodium bis(trimethylsilyl)amide at room temperature. The reverse reaction, namely demethylation of methyl phenyl ethers, was easily achieved by microwave heating with neat iodotrimethylsilane.

Determination of biogenic halogenated methyl-phenyl ethers (halogenated anisoles) in the picogram m -3 range in air

1996 ◽  
Vol 354 (3) ◽  
pp. 333-343
Author(s):  
Ursula F�hrer ◽  
Angela Dei�ler ◽  
K. Ballschmiter
Keyword(s):  
Phenyl Ethers ◽  
Methyl Phenyl

scholarly journals Oxygen-Free Regioselective Biocatalytic Demethylation of Methyl-phenyl Ethers via Methyltransfer Employing Veratrol-O-demethylase

ACS Catalysis ◽  
2020 ◽  
Vol 10 (18) ◽  
pp. 10375-10380
Author(s):  
Christopher Grimm ◽  
Mattia Lazzarotto ◽  
Simona Pompei ◽  
Johanna Schichler ◽  
Nina Richter ◽  
...  
Keyword(s):  
Phenyl Ethers ◽  
Methyl Phenyl

Analysis of Ni, Cr, Cu, Pb and Cd in marine bioindicators using mixed-micelles with microwave assisted micellar extraction and GF-AAS

2016 ◽  
Vol 8 (39) ◽  
pp. 7141-7149 ◽  
Author(s):  
A. M. Hernández-Martínez ◽  
C. Padrón-Sanz ◽  
M. E. Torres-Padrón ◽  
Z. Sosa-Ferrera ◽  
J. J. Santana-Rodríguez
Keyword(s):  
Heavy Metals ◽  
Mytilus Galloprovincialis ◽  
Mixed Micelles ◽  
New Method ◽  
Micellar Extraction ◽  
Nereis Diversicolor ◽  
Microwave Assisted ◽  
Gf Aas ◽  
Triton X

A new method has been developed for the extraction and determination of the heavy metals Ni, Cu, Cr, Pb, and Cd in mussels (Mytilus galloprovincialis) and polychaetes (Nereis diversicolor), using biodegradable mixed-micelles (SDS and Triton X-100) as the extractant, and GF-AAS analysis.

Monoacetylation of Carbohydrate Diols via Transesterification with Ethyl Acetate

2014 ◽  
Vol 67 (4) ◽  
pp. 679 ◽  
Author(s):  
Xuyu Liu ◽  
Bernd Becker ◽  
Matthew A. Cooper
Keyword(s):  
Ethyl Acetate ◽  
Efficient Method ◽  
New Method ◽  
Protecting Groups ◽  
Acyl Donor

Monoacetylation of secondary diols in protected monosaccharides was achieved with ethyl acetate as acyl donor and sodium tert-butoxide as a base. The regioseletivity of the reaction varied depending on the substrate. This new method provides a simple, fast, and efficient method to access selectively acetylated carbohydrates that is compatible with acid-sensitive protecting groups.

scholarly journals Development of a Microwave-assisted Chemoselective Synthesis of Oxime-linked Sugar Linkers and Trivalent Glycoclusters

2019 ◽  
Vol 12 (1) ◽  
pp. 39
Author(s):  
Katherine McReynolds ◽  
Dustin Dimas ◽  
Grace Floyd ◽  
Kara Zeman
Keyword(s):  
Biomedical Applications ◽  
Model System ◽  
Protecting Groups ◽  
Microwave Assisted ◽  
Synthetic Procedure ◽  
Chemoselective Synthesis ◽  
Aqueous Conditions ◽  
Acid Stable

A rapid, high-yielding microwave-mediated synthetic procedure was developed and optimized using a model system of monovalent sugar linkers, with the ultimate goal of using this method for the synthesis of multivalent glycoclusters. The reaction occurs between the aldehyde/ketone on the sugars and an aminooxy moiety on the linker/trivalent core molecules used in this study, yielding acid-stable oxime linkages in the products and was carried out using equimolar quantities of reactants under mild aqueous conditions. Because the reaction is chemoselective, sugars can be incorporated without the use of protecting groups and the reactions can be completed in as little as 30 min in the microwave. As an added advantage, in the synthesis of the trivalent glycoclusters, the fully substituted trivalent molecules were the major products produced in excellent yields. These results illustrate the potential of this rapid oxime-forming microwave-mediated reaction in the synthesis of larger, more complex glycoconjugates and glycoclusters for use in a wide variety of biomedical applications.

A novel photorearrangement of (coumarin-4-yl)methyl phenyl ethers

2009 ◽  
Vol 208 (2-3) ◽  
pp. 171-179 ◽  
Author(s):  
Janina Schaal ◽  
Nico Kotzur ◽  
Brigitte Dekowski ◽  
Jana Quilitz ◽  
Maria Klimakow ◽  
...  
Keyword(s):  
Phenyl Ethers ◽  
Methyl Phenyl
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