نتایج جستجو برای: methoxymethyl ethers

تعداد نتایج: 7421  

Journal: :iranian journal of catalysis 2015
farhad shirini masoumeh abedini mahnaz shamsi-sani mohadeseh seddighi

a mild, efficient and fast method for the oxidation of alcohols and trimethylsilyl, tetrahydropyranyl and methoxymethyl ethers to their corresponding carbonyl compounds using cro3 in the presence of rice husk ash (rha) is reported. all reactions were performed at room temperature in high to excellent yields. a new, efficient and green catalyst, heterogeneous reaction conditions, easy work-up of...

A mild, efficient and fast method for the oxidation of alcohols and trimethylsilyl, tetrahydropyranyl and methoxymethyl ethers to their corresponding carbonyl compounds using CrO3 in the presence of rice husk ash (RHA) is reported. All reactions were performed at room temperature in high to excellent yields. A new, efficient and green catalyst, heterogeneous reaction conditions, easy work-up of...

2001
G. Romanelli H. Thomas

Deprotection of various phenols from their respective methoxymethyl ethers using an heteropolyacid catalyst was studied. The catalyst was the Wells-Dawson heteropolyacid, used both in bulk or supported on silica. Yields were high to quantitative after less than one hour reaction time and the catalyst was easily recoverable and reusable.

Journal: :iranian chemical communication 0
abbas amini manesh payame noor university, hamedan ardeshir khazaei faculty of chemistry, bu-ali sina university, p.o. box 651783868, hamedan, iran maedeh gohari department of chemistry, payame noor university, 19395-4697 tehran, i. r. of iran mahdieh chegeni department of chemistry, faculty of science, ayatollah ozma boroujerdi university, boroujerd, iran shahnaz saednia young researchers & elites club, toyserkan branch, islamic azad university, toyserkan, iran

methoxymethylation of a variety of alcohols was performed using formaldehyde dimethyl acetal in the presence of 1,3-dichloro-5,5-dimethyl hydantoin [dcdmh] and poly n,n′-dibromo-n-ethyl naphthyl-2,7-disulfonamide [pbns] as catalysts at room temperature and under solvent-free conditions. our experiments show that primary and secondary alcohols can be smoothly converted into the corresponding mom...

Methoxymethylation of a variety of alcohols was performed using formaldehyde dimethyl acetal in the presence of 1,3-dichloro-5,5-dimethyl hydantoin [DCDMH] and Poly N,N′-dibromo-N-ethyl naphthyl-2,7-disulfonamide [PBNS] as catalysts at room temperature and under solvent-free conditions. Our experiments show that primary and secondary alcohols can be smoothly converted into the corresponding MOM...

A mild, efficient and fast method for the oxidation of alcohols and trimethylsilyl, tetrahydropyranyl and methoxymethyl ethers to their corresponding carbonyl compounds using CrO3 in the presence of rice husk ash (RHA) is reported. All reactions were performed at room temperature in high to excellent yields. A new, efficient and green catalyst, heterogeneous reaction conditions, easy work-up of...

Journal: :Journal of The Energy Institute 2022

Replacing fossil fuels by oxymethylene ethers (OMEs) produced from renewable resources could help to reduce the rising CO2 levels. In this work, thermal decomposition chemistry of methoxymethyl formate (CH3OCH2OCHO) and formic anhydride (OCHOCHO) is investigated means a combination quantum chemical calculations kinetic modeling. The latter compounds are two important intermediates formed during...

Journal: :Beilstein Journal of Organic Chemistry 2008
Rajeev K Shrivastava Elise Maudru Gurdial Singh Richard H Wightman Keith M Morgan

Treatment of 5-(tert-butyldimethylsilyl)-2,3-O-isopropylidene-D-ribose with lithium acetylides gave mixtures of syn- and anti-alkynols 2a-2c which were separated following protection as methoxymethyl ethers. These were converted to the corresponding iodides which underwent 6-exo-dig radical cyclisation to afford chiral cyclohexanes and carbasugars. Oxidation of the primary alcohols 6a-b gave th...

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