نتایج جستجو برای: phosphite ester

تعداد نتایج: 37751  

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 1996
farajollah mohanazadeh yousef ranjbar

deprotection of phosphate, phosphate, and sulfite esters by silica chloride is described. silica chloride is a mild, selective, and effective reagent for cleavage of benzyl and t-butyl esters of the above compounds.

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1978
E L Muetterties J F Kirner W J Evans P L Watson S Abdel-Meguid I Tavanaiepour V W Day

A simple synthesis of the zerovalent complex Mo[P(OCH(3))(3)](6) has been devised from a potassium reduction of MoCl(4)(tetrahydrofuran)(2) followed by reaction with trimethyl phosphite at 70 degrees . Protonation of this octahedral complex gave only low yields of the expected seven-coordinate hydride, HMo[P(OCH(3))(3)](6) (+). The major product was an octahedral nonhydridic cation, Mo[P(OCH(3)...

Journal: :Bioresource technology 2008
Reed E Oshel Mecheril V Nandakumar Sameer Urgaonkar David G Hendricker John G Verkade

Ethanol production from corn starch in the corn dry milling process leaves Distillers' Dry Grains and Solubles (DDGS) as a major by-product from which additional ethanol may be economically obtained from its glucan content. A challenge in processing the cellulose content of this material lies in its extensive inter-cellulose chain hydrogen bonding, which inhibits access of enzymes capable of cl...

Farajollah Mohanazadeh, Yousef Ranjbar

Deprotection of phosphate, phosphate, and sulfite esters by silica chloride is described. Silica chloride is a mild, selective, and effective reagent for cleavage of benzyl and t-butyl esters of the above compounds.

Journal: :Analytical biochemistry 2011
Oliver Berkowitz Ricarda Jost Stuart J Pearse Hans Lambers Patrick M Finnegan Giles E St J Hardy Philip A O'Brien

A sensitive fluorometric assay for the quantification of phosphite has been developed. The assay uses the enzymatic oxidation of phosphite to phosphate by a recombinant phosphite dehydrogenase with NAD(+) as cosubstrate to produce the highly fluorescent reaction product resorufin. The optimized assay can be carried out in a 96-well microtiter plate format for high-throughput screening purposes ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2010
Peter A Jordan Katherine J Kayser-Bricker Scott J Miller

Despite the ubiquitous use of phosphoramidite chemistry in the synthesis of biophosphates, catalytic asymmetric phosphoramidite transfer remains largely unexplored for phosphate ester synthesis. We have discovered that a tetrazole-functionalized peptide, in the presence of 10-Å molecular sieves, functions as an enantioselective catalyst for phosphite transfer. This chemistry in turn has been us...

2015
Ricarda Jost Made Pharmawati Hazel R Lapis-Gaza Claudia Rossig Oliver Berkowitz Hans Lambers Patrick M Finnegan

Phosphite is a less oxidized form of phosphorus than phosphate. Phosphite is considered to be taken up by the plant through phosphate transporters. It can mimic phosphate to some extent, but it is not metabolized into organophosphates. Phosphite could therefore interfere with phosphorus signalling networks. Typical physiological and transcriptional responses to low phosphate availability were i...

Journal: :Journal of bacteriology 2010
Diliana Dancheva Simeonova Marlena Marie Wilson William W Metcalf Bernhard Schink

Desulfotignum phosphitoxidans is a strictly anaerobic, Gram-negative bacterium that utilizes phosphite as the sole electron source for homoacetogenic CO2 reduction or sulfate reduction. A genomic library of D. phosphitoxidans, constructed using the fosmid vector pJK050, was screened for clones harboring the genes involved in phosphite oxidation via PCR using primers developed based on the amino...

2014
SARA HALLAJIAN ESKANDAR ALIPOUR NASER FOROUGHIFAR MOHAMMAD A. KHALILZADEH

The reaction of dimethyl acetylenedicarboxylate with OH-acid such as 2-naphthol in the presence of trimethyl or triphenyl phosphite under solvent-free conditions produce oxaphosphaphenanthrene derivatives in good yields. Also, the reaction of dimethyl acetylenedicarboxylate and trimethyl phosphite in the presence of 1-naphthol leads to succinate derivatives in excellent yields. Using triethyl p...

2010
B. L. Shearer

Low volume aerial phosphite applications has been used in recent years at rates of up to 24 kg ha" to protect native plant species and communities threatened by Phytophthora cinnamomi while the recommended rate for spray to run-off phosphite application is 5 g L·'. Phosphite uptake and in planta phosphite concentrations in native plant species may vary considerably between species and with appl...

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