enolates chain elongating syntheses of carbonyl compounds and carboxylic acid derivatives

... of oxygenate desorption and decomposition 1.6 Objectives of the Present Work The objectives of the present work are to investigate the adsorption and reactions of several groups of carbonyl compounds ... SURFACE CHEMISTRY OF ORGANIC CARBONYL COMPOUNDS AND THEIR DERIVATIVES ON Ni(111) LI TINGCHENG (B.Sc WUHAN UNIVERSITY) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMISTRY ... the corresponding carbonyl compounds, i.e acetone and acetaldehyde, respectively The understanding of the surface reaction mechanisms of these molecules is of fundamental value and carries potential...

Ngày tải lên: 17/09/2015, 17:19

... with metal salts for detection of amines (Guilbault et al., 1972), (2) QCM coated with 10  cryptands for detection of alcohols and carboxylic acid (Chang and Shih, 2000), and (3)  SAW  coated  with  hydrogen  bond  acidic  ... strength  of metal­ligand  interactions  depend  on the nature of metal ions and ligands. Ligands with strong interactions create large  energy  level  splitting  of metal  ions  d  orbitals  and ... spectra of PSCLCs with different rations of NOA61 (0 – 30% w/w)……………………………… …… 71 Effect of temperature on the optical responses of PSCLCs (with 5%, 10%, and 20% of NOA61) to 400 ppmv of octylamine...

Ngày tải lên: 10/09/2015, 15:51

... Interestingly, usage of lithium base showed poor regioselectivity (Table 1, entry 15) and usage of DIPEA or absence of base afforded no cyclization products (Table 1, entries 13 and 14) This way, ... reduction of cyano to methyl and oxidation of hydroxyl group of the cyclopentane moiety (Scheme 5) At first step, cyanocyclopentyl alcohol 8b was treated with DIBAH (along with the corresponding acidic ... type of cyclization other acidic species, in order to evaluate if an additional 5endo promotion could emerge to improve yield of cyclopentanic structures over cyclobutanic with no chemo and stereoselectivity...

Ngày tải lên: 26/01/2016, 10:44

... success of these reactions using SmI2 prompted us to examine the reductive cleavage of the N-O bond of N-benzyl-N-acetylhydroxamic acid (Table 3, Entries and 2) Typically hydroxamic acids are ... Hydroxamic Acid Derivatives Preparation of 3-aza-2-oxa-3-benzylbicyclo[2.2.2]oct-5-ene (20) To a stirring solution of hydroxamic acid derivative 19 l° (0.44 g, 2.0 mmol) in 100 mL of Et20 was ... excellent yield of N-benzyl-benzylcarbamate Interestingly, upon examination of a similar substrate, an N,O-benzyl-phenyloxycarbonyl-hydroxylamine derivative, (Entries and 3), none of the desired...

Ngày tải lên: 22/03/2014, 18:20

... of the causes and effects of acidic deposition and a comparison of the costs and effectiveness of alternative emission control scenarios Since adverse effects of acid rain on fish have been of ... Within acid- sensitive regions of the United States, percent of the lakes and percent of the streams are chronically acidic Florida has the highest percentage of acidic surface waters (23 percent of ... transport of pollutants from the heavily industrialized areas of northern Europe The rain and snow in portions of eastern Canada and the eastern United States are as acid as in southern Scandinavia, and...

Ngày tải lên: 10/08/2014, 20:20

... (KDM) and two varieties from Korea, Chucheong variety (milled rice), and Black rice (mixture of several varieties) For the identification and quantification of change in 2-AP and other volatile compounds, ... Pirouette®software RESULTS AND DISCUSSION 3.1 Extraction, identification, and quantification of 2-AP in Pandan leaf In this experiment, response factor (RF) of collidine has been used to identify and ... standard to identify and quantify 2-AP in aromatic rice (Phan Phuoc Hien, 2009; 2010; 2011) Quantification of 2-AP in pandan leaf: Fig System of the SPME extraction 732 Content of - AP in pandan...

Ngày tải lên: 28/08/2013, 16:28

... Society of Chemistry, 1992, A788 Aconitic acid A-108 [499-12-7] 1-Propene-1,2,3-tricarboxylic acid, 9CI Achilleaic acid Citridinic acid Equisetic acid Pyrocitric acid 3-Carboxy-2-pentenedioic acid ... headings AND PRESENTATION are of six types The selection of compounds for DFC is broad Included Structural headings (WA) classify naturally occurring are all compounds or group of compounds of interest ... indication of crystal form and of recrystallisation solvent is often given but these are imprecise items of data; most compounds can be crystallised from several solvent systems and the crystal form often...

Ngày tải lên: 16/09/2013, 21:58

... density of RTA R213D in the vicinity of residue 213 The backbone and sidechains of the R213D substitution are shown as stereo images in thick ball and stick and the position of the Arg213 side -chain ... density of RTA N122A in the vicinity of residue 122 The backbone and sidechains of the N122A substitution are shown as stereo images in thick ball and stick and the position of the Asn122 side -chain ... activity of ricin A chain (Eur J Biochem 271) 155 Creation of ricin A chain variants Ricin A chain variants containing single amino acid substitutions were generated by PCR mutagenesis and standard...

Ngày tải lên: 19/02/2014, 12:20

... Pta-F1, the last 352 amino acids in the case of Pta-F2, and the last 470 amino acids in the case of Pta-F3 (Fig 2) PCR reactions performed in a final volume of 25 lL, and using the following components: ... from CONICET and ´ ´ Agencia Nacional de Promocion Cientı´ fica y Tecnologica M F Drincovich and C S Andreo are members of the Researcher Career of CONICET, and V A Campos-Bermudez and F P Bologna ... specific amino acids involved in metabolic regulation and stabilization of this Pta [5] On the other hand, crystal structure analysis of several PtaIs, which lack the N-terminal end of PtaII, revealed...

Ngày tải lên: 06/03/2014, 11:20

... Comparison of colocalization and focal staining of Pol e and RNA pol II by immunoelectron microscopy The number of gold particles representing Pol e (5 nm) and RNA pol II (10 nm), and the fraction of ... immunoprecipitations, mg of protein A– or G–Sepharose and lL of p140 serum, lL of K30 serum and lg of purified GIA antibody were used to precipitate, in parallel, Pols a, d and e, respectively Immunoprecipitates ... incubated in the presence of radioactive UTP or dATP and the photoreactive DNA precursor BrdUTP, and subjected to UV crosslinking The photolabelled derivatives of Pols a, d and e were then resolved...

Ngày tải lên: 07/03/2014, 11:20

... source temperature of 100 °C and capillary and cone voltages of 4230 V and 29 V, respectively NMR of His-cTCRf Results The protein was resuspended in 500 lL H2O and 50 lL D2O, and the pH adjusted ... scan range of 500–2500 m/z, a source temperature of 100 °C, and capillary and cone voltages of 4230 V and 29 V, respectively Mass profiles were deconvoluted using the maximum entropy software MAX ... metalloproteinase degradation of elastin, type-IV collagen and proteoglycan: a quantitative comparison of the activities of 95 kDa and 72 kDa gelatinases, stromelysin-1 and stromelysin-2 and punctuated metalloproteinase...

Ngày tải lên: 08/03/2014, 02:20

... tuberculosis barrier and to virulence [2–5] DIMs are composed of a mixture of long chain b-diols, esterified by multimethyl-branched fatty acids, the mycocerosic acids [6] (Fig 1) These compounds are ... elongation of either C22–24 fatty acids or p-hydroxyphenylalkanoic acids by the addition of malonyl-CoA and methylmalonyl-CoA extender units to yield phthiocerol and phenolphthiocerol derivatives, ... Structures of the DIM A and DIM B produced by Mycobacterium tuberculosis and Mycobacterium bovis BCG and of the glycosylated phenolphthiocerol dimycocerosates produced by M tuberculosis (PGL-tb) and...

Ngày tải lên: 15/03/2014, 11:20

... lanes and 5), Nd-sD (200 lg; Fig 5, lanes and 6) and two transgenic lines [L6 · (5 lg; Fig 5, lanes and 7) and H -chain L -chain fhx/25 H -chain : L -chain : fhx/P25 L7-4 (200 lg; Fig 5, lanes and ... for H -chain, 50 ng for Lchain and 125 ng for fhx/P25 from cocoons of C108 and the transgenic line L6 · 7, or lg for H -chain, 10 lg for L -chain and 100 lg for fhx/P25 from naked-pupa cocoons of Nd-sD ... H -chain, L -chain, and fhx/P25 as shown by Western blotting (Fig 1D) When fractions 13–15 (bracketed) were pooled and analyzed by the quantitative ELISA, the molar ratio of H- and L-chains, and...

Ngày tải lên: 16/03/2014, 16:20

... (KDM) and two varieties from Korea, Chucheong variety (milled rice), and Black rice (mixture of several varieties) For the identification and quantification of change in 2-AP and other volatile compounds, ... Pirouette®software RESULTS AND DISCUSSION 3.1 Extraction, identification, and quantification of 2-AP in Pandan leaf In this experiment, response factor (RF) of collidine has been used to identify and ... standard to identify and quantify 2-AP in aromatic rice (Phan Phuoc Hien, 2009; 2010; 2011) Quantification of 2-AP in pandan leaf: Fig System of the SPME extraction 732 Content of - AP in pandan...

Ngày tải lên: 19/03/2014, 16:20

... images, both diameter and length of nanowires were larger than those of nanotubes; the diameter and length of nanowires were about 10–50 nm and several mm, respectively TEM images and nitrogen adsorption ... almost only nanowires Those of (c) and (d) show both nanowires and small amount of particles Over 800 1C, the surfaces of nanowires became smooth because of the progress of surface diffusion (At ... spacings of ð201ÞTiO2 ðBÞ and (103)anatase are 5.08 and ˚ 2.43 A (almost half of the former), respectively [26,27] In addition, those of ð110ÞTiO2 ðBÞ and corresponding ˚ (101)anatase are 3.57 and...

Ngày tải lên: 20/03/2014, 13:08

... mammalian carcinogens Pure standard materials and stock standard solutions of these compounds should be handled with suitable protection to skin, eyes, etc EQUIPMENT AND SUPPLIES (All specifications ... detection limits 9.3.5 Develop and maintain a system of control charts to plot the precision and accuracy of analyte and surrogate measurements as a function of time Charting of surrogate recoveries ... internal standards for each analyte and surrogate, and quantitation ions for all compounds This calculation is supported in acceptable GC/MS data system software (Section 6.10.4), and many other software...

Ngày tải lên: 22/03/2014, 14:20

... properties to Program Offices (e.g., Office of Water, Office of Solid Waste and Emergency Response, Office of Prevention, Pesticides and Toxic Substances) and Regional Offices Also, SPARC has been used ... databases The strength of the electrostatic interaction between S and C depends on the magnitude and relative orientation of the local fields of S and C and the dielectric properties and distances through ... molecules such as oxy acids and aliphatic bases and acids within ±0.25 pKa units; ±0.36 pKa units for most other organic structures such as amines and acids; and ±0.41 pKa units for =N and in-ring N...

Ngày tải lên: 22/03/2014, 14:20

... stabilization of aromatic compounds, conjugative stabilization of linear polyenes and polyynes, and steric effects in cisand trans- isomers Kistiakowsky's measurement of AhydH of benzene (Conant and Kistiakowsky, ... part of hydrogen thermochemistry: Vll Vlll Heats of Hydrogenation Practical and historical aspects of experimental determination of the enthalpies of hydrogenation and formation \ydH29S and Af ... Fitting a pair of verticals to the extrapolated linear drifts before and after reaction for a series of 18 alternating injections of standard and sample leads to a series of ratios of verticals...

Ngày tải lên: 01/04/2014, 10:53

... acetic acids Propionic acid conclusions 1-20 Cyan-acetic acid Thio-acetic acid Butyric acid; isobutyric acid, Hamonet's Valeric acid Capronic acid Oxalic acid etc Malonic acid Succinic acid acid ... EXPERIMENTS OF MILLER AND HOFER (1) Glycolic acid (2) Electrosy ntheses Ordinary lactic acid Sarco-lactic acid a-Oxy-butyric acid a-Oxy-isobutyric acid Tartaric acid Hydracrylic acid /S-Oxy-butyric acid ... Formation of aldehydes /7-Iodo-propionic acid Oxy-acids Iso- 35~36 Nitro-ethane 37 ELECTROSYNTHESES OF BROWN AND WALKER Formation of di-esters of dibasic acids Adipic acid Suberic acid Sebasic...

Ngày tải lên: 02/04/2014, 16:00

... production costs, output and prices by types of ownership, regions and size of mills • To obtain data on the nature of information and product flow, quality control standards and processes for livestock ... understanding of: • livestock feed production in Thailand; • participation of SMEs in the livestock feed sector in Thailand; and • the role of public policy in the livestock feed sector in Thailand ... Objective 2: Understand the role and performance of SMEs in the animal feed sector in other countries • Desk-top literature search and review of the nature, experiences and lessons of the animal feed...

Ngày tải lên: 21/06/2014, 04:20