borrowing hydrogen scheme in fine chemical synthesis
Supported group II transition metal catalysts in liquid phase reactions using borrowing hydrogen methodology 1
Ngày tải lên :
09/09/2015, 10:14
... nitroaromatic hydrogenation over an Ag nanocluster Scheme 1-2 Metal catalysed cross coupling Scheme 1-3 Borrowing hydrogen scheme in fine chemical synthesis Scheme 1-4 Activation of alkane by borrowing hydrogen ... substrate Borrowing hydrogen scheme in fine chemical synthesis Here, ‘cat’ refers to the dehydrogenation/hydrogenation catalyst Where the initial dehydrogenation is endothermic, particularly in the ... cross-coupling reaction mediated by silver oxide [63] 20 1.2 Borrowing hydrogen methodology in fine chemical synthesis Borrowing hydrogen catalysis is an important catalytic concept It is based on the intermediate...
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development of methodology for the palladium-catalysed synthesis of oxygen-containing heterocycles
Ngày tải lên :
22/12/2014, 21:07
... selective serotonin reuptake inhibitor (−)-histrionicotoxin nicotinic acetylcholine receptor inhibitor stachyflin H1N1 influenza inhibitor Figure 2.1: Heterocyclic rings in medicinal and natural ... Pd-catalysed carboiodination (Scheme 1.28) 52 In these reactions, the iodine from aryl starting material 1.119 is incorporated into product 1.120 via C−X bond forming reductive elimination from Pd(II) ... °C using dimethylaniline for h, giving rearranged product 2.38 in 30% yield (Scheme 2.18) However, the authors used microwave heating for the remaining substituted phenol examples reported in their...
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Decolorization of Dye with Iron Oxide Catalysed Decomposition of Hydrogen Peroxide
Ngày tải lên :
05/09/2013, 08:40
... the following explanations for hydrogen peroxide decomposition and dye removal Figure indicates that the portion of OH radical reacts with H2O2 is minimal in this experimental condition since the ... acknowledged REFERENCES Abbot J and Brown D.G (1990) Kinetics of Iron-Catalysed Decomposition of Hydrogen Peroxide in Alkaline Solution, Int J Chem Kinetics, 22, 963-974 Buxton G V., Greenstock C L., ... peroxide concentration was determined spectrophotometrically using TiⅣ method (Eisenberg, 1943) The aqueous concentration of dye was determined by measuring the absorbance intensity at the maximum absorbance...
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Tài liệu CCNA v2.0 Review Critical Concepts of the 640-802 CCNA Exam ppt
Ngày tải lên :
17/01/2014, 06:20
... point-to-point or multipoint • point-to-point defines a subinterface that will only have one DLCI (interface-dlci command) • multipoint defines a subinterface that may have more than one DLCI (interface-dlci ... Addresses? Disabled Discarding No No Listening Discarding Yes No Blocking Learning Forwarding Discarding Learning Forwarding Copyright ©2007 Global Knowledge Training LLC All rights reserved ... Router(config-line)# password string Router(config-line)# login User Auxiliary Port Router# configure terminal Router(config)# line auxiliary Router(config-line)# password string Router(config-line)# login...
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Tài liệu Báo cáo khoa học: Kinetic analysis of effector modulation of butyrylcholinesterase-catalysed hydrolysis of acetanilides and homologous esters pdf
Ngày tải lên :
18/02/2014, 17:20
... actual binding site of serotonin cannot be inferred from these results Although serotonin can bind to the active site binding locus (W82), binding to PAS cannot be ruled out If serotonin binds only ... result from tyramine binding to PAS Such qualitatively opposite effects can be tentatively interpreted in terms of allosteric inhibition activation: the binding of tyramine to PAS induces a conformational ... kinetic analysis of these inhibiting or activating effects was either incomplete [22,3639] or debatable [33,42] In particular, reported results were interpreted in terms of an AAA site distinct...
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Báo cáo khoa học: Comparative biochemical characterization of nitrile-forming proteins from plants and insects that alter myrosinase-catalysed hydrolysis of glucosinolatesk docx
Ngày tải lên :
23/03/2014, 11:20
... protein (341 amino acids) with 45–55% amino acid sequence identity to several A thaliana myrosinase-binding proteins In the presence of myrosinase, crude extracts of Escherichia coli expressing ... myrosinase assays (B) (L1, flow-through after binding of ESP; W1, wash step after binding of ESP; L2, flow-through after loading of plant extract containing myrosinase; W2, wash step after loading ... program interproscan (http://www.ebi.ac.uk/InterProScan/ European Bioinformatics Institute, Hinxton, Cambridge, UK) These features are known to mediate protein–protein interactions providing some...
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metal catalysed reactions of hydrocarbons fac
Ngày tải lên :
01/04/2014, 10:35
... Origin of Selectivity in Alkyne Hydrogenation 9.1.5 Interpretation of Results: Some Preliminary Comments 9.2 Hydrogenation of Ethyne: 1, In Static Systems 9.2.1 Introduction ... being incomplete Of the five d-orbitals, it is assumed that only 2.56 are capable of bonding, the remaining 2.44 being localised atomic d-orbitals, which are non-bonding, and capable of receiving ... atoms in the plane defined by the Miller indices will be swamped by that of the low-index plateaux Incidentally, scanning-tunnelling microscopy (STM) has shown that even surfaces giving a seemingly...
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palladium thiolate bonding of carbon nanotube thermal interfaces
Ngày tải lên :
06/05/2014, 08:54
... moderated by increasing the interfacial contact area In an effort to increase the interfacial contact area, developments in bonded and semibonded CNT TIMs have rendered thermal interface resistances ... semiconducting singlewalled CNTs interacting with Au and Pt nanoparticles and found a significant increase in the ratio of the metallic to semiconducting tubes when metal nanoparticles are introduced ... decrease in electron density in the valance band of Au and an increase in the outer orbitals of C, indicating direct charge transfer A recent study [16] also found significant changes in the Raman...
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palladium thiolate bonding of carbon nanotube thermal interfaces
Ngày tải lên :
06/05/2014, 08:58
... moderated by increasing the interfacial contact area In an effort to increase the interfacial contact area, developments in bonded and semibonded CNT TIMs have rendered thermal interface resistances ... semiconducting singlewalled CNTs interacting with Au and Pt nanoparticles and found a significant increase in the ratio of the metallic to semiconducting tubes when metal nanoparticles are introduced ... decrease in electron density in the valance band of Au and an increase in the outer orbitals of C, indicating direct charge transfer A recent study [16] also found significant changes in the Raman...
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Báo cáo vật lý: "Enzymatic Reduction of Ketones to Optically Active Secondary Alcohols" ppsx
Ngày tải lên :
07/08/2014, 14:20
... has been reduced dramatically by increasing the temperature of the fermentation step to 40°C This finding is encouraging to apply such technique in asymmetric synthesis However, the addition of ... fluorinated hydroxyketones using ketoreductases Org Lett., 9(24), 4951–4954 Busto, E., Gotor-Fernandez, V & Gotor, V (2006) Enantioselective synthesis of 4-(dimethylamino)pyridines through a chemical ... (Fig 1) to the corresponding optically active secondary alcohols The ketoreductase enzyme that was involved in the reduction process was generated in the reaction using baker’s yeast at 40°C...
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Pentanidium catalysed a hydroxylation reactions of cyclic ketones
Ngày tải lên :
13/10/2015, 15:57
... Chem, 1987, 4754 20 Chapter hydrogen bonding interaction π-π stacking interactions Figure 1.5 Interactions involved in influencing the ee of alkylation reaction Following the work from Merck’s ... permitting longevity, crop protection and growth enhancement chemicals introduced allowing an increase in global food production to meet with the exponential increase in world population In addition, ... resulting in the synthesis of a few variants of the catalyst 2.4.1 Synthesis of pentanidium The synthesis of pentanididium (Scheme 2.5) is very simple involving only steps Throughout the synthesis, ...
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Tài liệu Drugs and Poisons in Humans - A Handbook of Practical Analysis (Part 64) pptx
Ngày tải lên :
26/01/2014, 19:20
... al (1993) Atrazine in plasma and tissue following atrazine-aminotriazoneethylene glycol-formaldehyde poisoning J Toxicol Clin Toxicol 31:323–331 14) Naito H (2001) Poisoning of Industrial Products, ... remove impurities being contained in the cartridge A 1-mL volume of plasma or urine, containing diazine herbicides (both target and IS compound), is mixed with mL distilled water; in the case of whole ... 592 Diazine and triazine herbicides ⊡ Figure 7.1 Structures of diazine herbicides ⊡ Table 7.1 Structures of triazine herbicides ametryn atrazine cyanazine prometon prometryn propazine simazine metribuzin...
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Tài liệu OCCASIONAL PAPER SERIES NO 64 / JULY 2007: THE USE OF PORTFOLIO CREDIT RISK MODELS IN CENTRAL BANKS doc
Ngày tải lên :
16/02/2014, 10:20
... however, other financial risks in the balance sheet – including credit and interest rate risk – are usually very small Credit risk is only a minor component of overall financial risks, in particular ... comprehensive introduction into credit risk modelling, the interested reader is referred to one of the standard textbooks, including Bluhm et al (2003), Cossin and Pirotte (2007), Duffie and Singleton ... migration mode Finding reliable data may be a challenge, in particular for lower ratings and certain currencies A certain “smoothness” in the spreads is desired, to avoid a bias in simulation results...
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Tài liệu Báo cáo khoa học: The mechanism of a-proton isotope exchange in amino acids catalysed by tyrosine phenol-lyase doc
Ngày tải lên :
19/02/2014, 16:20
... times Rapid-scanning stopped-flow kinetic data were obtained with an RSM1000 instrument from OLIS, Inc This instrument has a dead time of % ms, and is capable of collecting spectra in the visible ... of amino acid inhibitors mentioned above The interaction of L-phenylalanine, L-methionine, and their a-deuterated analogs with TPL in D2O was characterized by the appearance of quinonoid intermediates, ... the quinonoid intermediate structure [18], but not in the external aldimine The observed predominant formation of the quinonoid intermediate in the reaction of TPL with L-methionine gives evidence...
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Tài liệu Báo cáo Y học: Phosphatidylinositol synthesis and exchange of the inositol head are catalysed by the single phosphatidylinositol synthase 1 from Arabidopsis docx
Ngày tải lên :
22/02/2014, 04:20
... results indicate that the yeast PtdIns synthase placed in a microbial environment is capable of catalysing several enzymatic reactions: PtdIns de novo synthesis, using CDP-DAG and free inositol ... and producing PtdIns and CMP; a CMP-independent exchange reaction whereby the inositol molecule of PtdIns can be replaced by another inositol polar head without net synthesis of PtdIns; a CMP-dependent ... medium lacking inositol, membranes were purified as described in Materials and methods and incubated under various conditions with different substrates The values indicated and in pmol PtdInsÆmin)1Æmg)1...
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Báo cáo khoa học: Relationship between the structure of guanidines and N-hydroxyguanidines, their binding to inducible nitric oxide synthase (iNOS) and their iNOS-catalysed oxidation to NO pptx
Ngày tải lên :
16/03/2014, 22:20
... 0.4 binding of an N-hydroxyguanidine moiety in the iNOS heme pocket thus roughly involves the same binding energy as binding of the guanidine moiety, and the equilibrium constants are mainly ... glycine nitrogen [17,19] It thus seems that in such a positioning, changing the N-hydroxyguanidine moiety into a guanidine moiety does not strongly modify the energy of binding to iNOS Preliminary ... to the binding of l-Arg [10–14] and NOHA [10], nothing is known about the thermodynamics and kinetics of the binding of guanidines and N-hydroxyguanidines to iNOS Removal of the a-amino or a-carboxylate...
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Báo cáo khoa học: Microperoxidase 8 catalysed nitrogen oxides formation from oxidation of N-hydroxyguanidines by hydrogen peroxide ppt
Ngày tải lên :
17/03/2014, 09:20
... following program: min, 5% B; min, linear gradient to 40% B in 10 min; 15 min, linear gradient to 100% B in 10 min; 30 min, linear gradient to 5% B in followed by 15 re-equilibration The absorbance was ... program: min, 10% B; min, linear gradient to 40% B in 10 min; 15 min, linear gradient to 100% B in 10 min; 28 min, linear gradient to 10% B in followed by 10 re-equilibration The absorbance was monitored ... Nx-hydroxy-L-arginine is an intermediate in the biosynthesis of nitric oxide from L-arginine J Biol Chem 296, 62596263 Clague, M.J., Wishnok, J.S & Marletta, M.A (1997) Formation of Nd-cyanoornithine from...
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leonardo da vinci life of 642
Ngày tải lên :
21/03/2014, 22:06
... the Florentine Republic in order to return to Milan, where he was to finish certain projects which he had left incomplete due to his earlier hasty departure In Milan he once again came into contact ... It was in Florence that Leonardo had his greatest following, and it was during his years there that he painted such classics as the Mona Lisa Then in 1506 Leonardo obtained temporary ... ingenieur ordinarie" He devoted much of his time to scientific studies and to the engineering projects such as the channeling of the course of the Adda river The return of the Sforza family in 1512...
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