Microwave-assisted hydrolysis of phosphonate diesters: an efficient protocol for the preparation of phosphonic acids

2012 ◽  
Vol 14 (8) ◽  
pp. 2282 ◽  
Author(s):  
Petr Jansa ◽  
Ondřej Baszczyňski ◽  
Eliška Procházková ◽  
Martin Dračínský ◽  
Zlatko Janeba
Keyword(s):  
Phosphonic Acids ◽  
Microwave Assisted ◽  
Hydrolysis Of

ChemInform Abstract: Microwave-Assisted Hydrolysis of Phosphonate Diesters: An Efficient Protocol for the Preparation of Phosphonic Acids.

ChemInform ◽  
2012 ◽  
Vol 43 (51) ◽  
pp. no-no
Author(s):  
Petr Jansa ◽  
Ondrej Baszczynski ◽  
Eliska Prochazkova ◽  
Martin Dracinsky ◽  
Zlatko Janeba
Keyword(s):  
Phosphonic Acids ◽  
Microwave Assisted ◽  
Hydrolysis Of

Microwave-assisted enzymatic hydrolysis of starch

2009 ◽  
Author(s):  
Marcin Lukasiewicz ◽  
Anna Osowiec ◽  
Magdalena Marciniak
Keyword(s):  
Enzymatic Hydrolysis ◽  
Microwave Assisted ◽  
Hydrolysis Of

scholarly journals Microwaves as “Co-Catalysts” or as Substitute for Catalysts in Organophosphorus Chemistry

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1196
Author(s):  
György Keglevich
Keyword(s):  
Coupling Reaction ◽  
Diels Alder ◽  
Typical Case ◽  
Conventional Heating ◽  
Phosphine Oxides ◽  
Phosphonic Acids ◽  
Co Catalysts ◽  
Mw Irradiation ◽  
Organophosphorus Chemistry ◽  
Hydrolysis Of

The purpose of this review is to summarize the importance of microwave (MW) irradiation as a kind of catalyst in organophosphorus chemistry. Slow or reluctant reactions, such as the Diels-Alder cycloaddition or an inverse-Wittig type reaction, may be performed efficiently under MW irradiation. The direct esterification of phosphinic and phosphonic acids, which is practically impossible on conventional heating, may be realized under MW conditions. Ionic liquid additives may promote further esterifications. The opposite reaction, the hydrolysis of P-esters, has also relevance among the MW-assisted transformations. A typical case is when the catalysts are substituted by MWs, which is exemplified by the reduction of phosphine oxides, and by the Kabachnik–Fields condensation affording α-aminophosphonic derivatives. Finally, the Hirao P–C coupling reaction may serve as an example, when the catalyst may be simplified under MW conditions. All of the examples discussed fulfill the expectations of green chemistry.

Microwave-assisted hydrolysis of lutein and zeaxanthin esters in marigold (Tagetes erectaL.)

2011 ◽  
Vol 62 (8) ◽  
pp. 851-856 ◽  
Author(s):  
Hongcheng Liu ◽  
Ying Zhang ◽  
Bin Zheng ◽  
Qiwan Li ◽  
Yanhong Zou
Keyword(s):  
Microwave Assisted ◽  
Hydrolysis Of

One Step Microwave-Assisted Synthesis of Fluorinated Titania Photocatalyst

2015 ◽  
Vol 670 ◽  
pp. 177-182
Author(s):  
Alexey A. Sadovnikov ◽  
Alexander E. Baranchikov ◽  
Vladimir Kozik ◽  
Lyudmila P. Borilo ◽  
Sergey A. Kozyukhin ◽  
...  
Keyword(s):  
Ammonium Fluoride ◽  
Organic Dye ◽  
Microwave Assisted Synthesis ◽  
Dye Sensitized ◽  
Microwave Assisted ◽  
One Step ◽  
Nanocrystalline Titanium ◽  
Nanocrystalline Titanium Dioxide ◽  
Titania Photocatalyst ◽  
Hydrolysis Of

Microwave-assisted high temperature hydrolysis of titanium oxysulfate, in the presence of ammonium fluoride, allows synthesizing nanocrystalline titanium dioxide photocatalysts possessing photocatalytic activity as high as the commercial photocatalyst Evonik Aeroxide® TiO2 P 25. Dye-sensitized reactions play an important role in organic dye discoloration in the presence of fluorinated titania.

Acid–base synergistic catalysis of biochar sulfonic acid bearing polyamide for microwave-assisted hydrolysis of cellulose in water

Cellulose ◽  
2018 ◽  
Vol 26 (2) ◽  
pp. 751-762 ◽  
Author(s):  
Zengtian Chen ◽  
Qingfeng Li ◽  
Yuxue Xiao ◽  
Chao Zhang ◽  
Zaihui Fu ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Acid Base ◽  
Synergistic Catalysis ◽  
Microwave Assisted ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

scholarly journals Novel Greener Microwave-Assisted Deprotection Methodology for the 1,3-Dioxolane Ketal of Isatin Using Calix[n]arenes

2022 ◽  
Author(s):  
Lucas Barbosa ◽  
Tiago da Silva ◽  
Michelle Rezende ◽  
Bianca da Silva ◽  
Rodrigo Guzzo ◽  
...  
Keyword(s):  
Aromatic Ring ◽  
Sulfonic Acid ◽  
Microwave Energy ◽  
Protecting Group ◽  
Additional Advantage ◽  
Microwave Assisted ◽  
Combined Use ◽  
Ketone Carbonyl ◽  
First Time ◽  
Hydrolysis Of

In this work, the combined use of p-sulfonic acid-calix[n]arene and microwave energy to hydrolyze the 1,3-dioxolane ketal of isatin was evaluated with excellent results. This is the first time that p-sulfonic acid-calix[n]arene has been used as the catalyst in a ketal hydrolysis reaction and the deprotection of the ketone carbonyl of isatin is reported. The presence of 2.5 mol% of p-sulfonic acid-calix[4,6]arene at 160 ºC resulted in over 96% conversion of this ketal in 10 min, with the additional advantage of using water as a solvent. This catalytic system (aqueous phase containing p-sulfonic acid-calix[4]arene) was reused for five consecutive cycles, with a conversion above 96% maintained. This reusable system is not practicable using p-toluenesulfonic acid and p-hydroxybenzenesulfonic acid as catalysts since both are extracted to the organic phase with the reaction product. The hydrolysis of 1,3-dioxolane ketal of isatins with different substituents (CH3, I, Br, Cl, F, NO2) in the aromatic ring was also evaluated. The protecting group of 5-methyl-isatin was removed with 73% conversion using 2.5 mol% of p-sulfonic acid-calix[4]arene at 160 ºC for 5 min. In contrast, the ketal of 5-nitro-isatin reached 80% conversion using the same conditions after 40 min.

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