نتایج جستجو برای: phosphite ester

تعداد نتایج: 37751  

Journal: :Biochemistry 2007
Tina L Amyes John P Richard

More than 80% of the rate acceleration for enzymatic catalysis of the aldose-ketose isomerization of (R)-glyceraldehyde 3-phosphate (GAP) by triosephosphate isomerase (TIM) can be attributed to the phosphodianion group of GAP [Amyes, T. L., O'Donoghue, A. C., and Richard, J. P. (2001) J. Am. Chem. Soc. 123, 11325-11326]. We examine here the necessity of the covalent connection between the phosp...

Journal: :Journal of Coordination Chemistry 2021

Thioether-phosphite ligands (SP’s) with axially chiral (S)-H0- or (S)-H8-binaphthyl moiety and their [Rh(COD)(SP)]BF4 complexes have been synthesized to study coordination chemistry catalytic features compare them those of the structurally analogous phosphine-phosphites (PP’s). NMR exchange studies on showed selective 1,5-cyclooctadiene dynamics. Firm evidence has found that this fluxional proc...

Journal: :Indian Journal of Pharmaceutical Sciences 2021

The current study was designed to conduct the physicochemical, phytochemical and gas chromatography- mass spectrometry analysis of Chenopodium album Stellaria media L. Methanolic extract dried leaves prepared subsequently fractionated using different solvents like hexane, chloroform, ethyl acetate. Obtained plant fractions were analyzed for presence secondary metabolites screening methods. Furt...

Journal: :Progress in Organic Coatings 2021

To create an effective adhesion promotion for different surfaces, specific anchor groups are necessary such as phosphonic metals. Biobased phosphorylated monomer from cardanol was synthesized and polymerized by UV curing or miniemulsion radical polymerization. Phosphonic ethoxy methacrylate (CMP) via hydroxyethylation, followed phosphorylation addition of dimethyl phosphite onto the unsaturatio...

Journal: :Organic & biomolecular chemistry 2011
Ana Alcaine Eugenia Marqués-López Pedro Merino Tomás Tejero Raquel P Herrera

Bifunctional thiourea catalyzes the enantioselective Michael addition reaction of diphenyl phosphite to nitroalkenes. This methodology provides a facile access to enantiomerically enriched β-nitrophosphonates, precursors for the preparation of synthetically and biologically useful β-aminophosphonic acids. DFT level of computational calculations invoke the attack of the diphenyl phosphite to the...

Journal: :Chemical communications 2005
Miguel Rubio Andrés Suárez Eleuterio Alvarez Antonio Pizzano

Chiral phosphine-phosphites provide versatile catalysts for the highly enantioselective hydrogenation of alpha-acyloxy alpha, beta-unsaturated phosphonates.

2005
Barry V. L. POTTER

Syntheses of a metabolite of the second messenger myo-inositol 1,4,5-trisphosphate, myo-inositol 1,4bisphosphate, and an analogue, the 1,4-bisphosphorothioate, are reported, by using phosphite chemistry on (± )1,2: 4,5-di-isopropylidene-myo-inositol. The synthesis of (± )1,2: 4,5-di-isopropylidene 3,6-bis[di-(2cyanoethyl)]phosphite provides an intermediate that can be oxidized to either the cor...

Journal: :Chemical communications 2016
Yasuhiro Sawamura Yoshihiro Ogura Hidefumi Nakatsuji Akira Sakakura Kazuaki Ishihara

Chiral phosphite-urea bifunctional catalysts have been developed for the enantioselective bromocyclization of 2-geranylphenols with N-bromophthalimide (NBP) for the first time. The chiral triaryl phosphite moiety activates NBP to generate a bromophosphonium ion. On the other hand, the urea moiety interacts with a hydroxyl group of the substrate through hydrogen bonding interactions. Enantiosele...

2015
Cheau Yuaan Tan Hidehiko Hirakawa Teruyuki Nagamune

Diverse applications of the versatile bacterial cytochrome P450 enzymes (P450s) are hampered by their requirement for the auxiliary proteins, ferredoxin reductases and ferredoxins, that transfer electrons to P450s. Notably, this limits the use of P450s as immobilized enzymes for industrial purposes. Herein, we demonstrate the immobilization of a bacterial P450 and its redox protein partners by ...

Journal: :Beilstein Journal of Organic Chemistry 2005
T Kop-Weiershausen J Lex J-M Neudörfl B Goldfuss

Biphenyl-2,2'-bisfenchol (BIFOL) based chlorophosphite, BIFOP-Cl, exhibits surprisingly high stabilities against hydrolysis as well as hydridic and organometallic nucleophiles. Chloride substitution in BIFOP-Cl proceeds only under drastic conditions. New enantiopure, sterically demanding phosphorus ligands such as a phosphoramidite, a phosphite and a P-H phosphonite (BIFOP-H) are hereby accessi...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید