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Showing 1 to 20 of 30 for “"methoxide"”.
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NMR study of palladium methoxide and palladium carbomethoxide complexes
The preparation of palladium methoxide complexes was attempted by reacting LiOCH3 with precursors such as Me2- bpyPdCl2 , [(Me2-bpy)Pd(CH3CN)2 J (BF4 )2 and (Me2-bipy)Pd(OAC)2 which have been synthesized for this purpose. Typically the reactions were done on small scale in an NMR tube and monitored …
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Exploring the Chemistry of Methoxide with Oxygen through Photoelectron Imaging Spectroscopy
… to probe the gas-phase chemistry between methoxide (CH3O) and oxygen, including evidence of previously unexplored reaction paths and providing further insight into the fundamentals of chemical bonding. First, the known reaction of CH3O and O2 to produce the hydroperoxide anion (HO2) is …
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Mechanisms of Methoxide Ion Substitution and Acid- Catalyzed Z/E Isomerization of N-Methoxyimines
… rate constants for nucleophilic substitution by methoxide of (Z)- and (E)-O-methylbenzohydroximoyl fluorides [C6H4C(F)=NOCH3] with various substituents on the phenyl ring [p-OCH3 (1h, 2h), p-CH3 (1g, 2g), p-Cl (1f, 2f), p-H (1e, 2e), (3,5)-bis-CF3 (1i, 2i)] in 90:10 DMSO:MeOH have been measured. …
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Synthesis and cycloaddition chemistry 1,3-Bis(phenylsulfonyl)propadiene
… by treatment with sodium hydride. Potassium methoxide treatment of the furan cycloadducts resulted in the isolation of a methoxide addition product together with the aromatised adduct. Procedures for the synthesis ofphenylsulfinylpropadiene and phenylsulfonylpropadiene are described.
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Reaction chemistry of C₁ hydrocarbon fragments and oxygenates on Cr₂O₃ (101̅2)
… dehydrogenation to formate, and hydrogenation to methoxide. Methoxide hydrogenation produces methane and methanol near 670 K. Formate decomposition occurs at 720 K, producing acetylene, carbon monoxide, carbon dioxide and formic acid. The site requirements for these reactions are a cation/anion …
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A study of the kinetic and thermodynamic properties of carbon acids in methanol
… labelled acid.</p> <p>The rate constants for the methoxide-catalyzed hydrogentritium exchange of chloroform, iodoform, 9-phenylfluorene and indene were determined in methanol at various temperatures. The second-order rate constants obtained from these studies were shown to be the rate constants …
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PART I PREPARATION OF NOVEL LACTONES AND THEIR PRECURSORS DERIVED FROM METHYL SALICYLATE PART II NUCLEOPHILIC AROMATIC SUBSTITUTION IN A DINITROSALICYLIC LACTONE WITH RING OPENING AND ELIMINATION VIA MEISENHEIMER INTERMEDIATES
… included iodide, several amines, hydroxide, methoxide, thiophenoxide, thiosulfate, sulfides, thiocyanate, cyanide, and several enolates. Reaction with a nucleophile was accompanied by the consistent loss of the (beta)-hydroxyethoxy unit. In several of these experiments, the isolation and …
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PART I: INVESTIGATION OF ENDOCYCLIC NUCLEOPHILIC SUBSTITUTION AT DI- AND TETRA-COORDINATE SULFUR PART II: SYNTHESIS OF 3-TOSYL-1,2,3-BENZOXATHIAZOLE-2,2-DIOXIDE AND ITS REACTIONS WITH NUCLEOPHILES
… gave products from exo S-N bond cleavage. Sodium methoxide yielded products from both exo and endo S-N bond cleavage. An amide synthesis utilizing the cyclic sulfamate as a coupling reagent was also demonstrated.</p>
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Determination of Carbon Nanotube Modification by TG-MS and Pyrolysis-GC/MS
… the TG-MS data. Based on the data, some form of methoxide or methanol is imparting solubility to the SWNTs.
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The dehydrochlorination of 1,1-diaryl-2,2,2-trichloroethanes in protic and dipolar aprotic solvents
… 2, 2-trichloroethanes (DDT-type compounds) with methoxide-methanol and t-butoxide-t-butanol. Literature comparisons indicate that the kinetic evidence for these two systems is in accord with an "irreversible" E1cB elimination pathway. PART III Characteristics of weak base-promoted eliminations in …
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Chalcone derivatives from pyrrole-2-aldehyde
… acetophenone with benzaldehyde using sodium methoxide as a condensing agent. Chalcone and its derivatives have been prepared primarily as intermediates for the synthesis of anthocyanins and other related pigments.</p><p>In recent years extensive preparation and study of chalcones has been …
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Synthesis, Chemical Behavior, and Spectroscopic and Theoretical Probes of Cyamelurine and Related Compounds
… with methyl N-cyanomethanimidate and sodium methoxide in dimethyl sulfoxide and methanol to give the intermediate 2,4-bis (N'-cyano-N-formamidino)-1,3,5-triazine, which was subjected to short vacuum pyrolysis to give cyamelurine. The compound gave no evidence of (a) formation of (pi) …
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Molecular Magnetism: The Design, Synthesis, and Characterization of New Building Blocks for Molecule-based Magnetic Materials
… (VIII). Attempts to exchange the labile methoxide bridges of a tetraironIIl single molecule magnet of stoichiometry [Fe4(OMe)6(dpm)6] (Hdpm = dipivaloylmethane) with the triol appended porphyrins will be discussed. [molecular structure diagram will not copy here, but is available in full …
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An investigation into the use of ultrasound in the synthesis of fine chemicals
… from 2-bromthiophene using sodium methoxide with several catalyst systems (Cu, CuO, CuO/KI, CuO/KI/Copper acetyl acetonate).<br/><br/>2-Bromothiophene was used as a substrate in attempted Wurtz-type coupling reaction conditions. These reactions produced complex mixtures of …
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The synthesis and reactivity of 7-azaindolizines.
… Nucleophilic replacement of chlorine by methoxide and amino from 8-chloro-2-methyl-7-azaindolizine occurred readily. A number of simple alkyl, aryl, and carboethoxy substituted dipyrrolo[1 ,2-a;2,1-c]pyrazines have been obtained by the Chichibabin reaction between appropriate substituted …
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Studies in Benzopyran chemistry
… of the -- - 3,4-dibromochromans with sodium methoxide. Routes to 2,2-dimethylchroman-4-ones based on the Fries rearrangement of phenyl 3-methylbut-2-enoates and the reaction between a phenol and 3-methylbut-2-enoic acid have been examined. In many instances, the isomeric …
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Reactions of 4-chloro-2,6-dimethoxypyrimidine and 2-chlorothiazole with carbanion nucleophiles
… the product resulting from displacement of methoxide was the major substitution product, while reaction of 1 with propionitrile carbanion afforded a preponderance of the product resulting from chloride displacement. Photostimulated reaction of 2-chlorothiazole (2) with the potassium enolate …
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The chemistry of thujone : new enantioselective syntheses of Ambrox[Registered trade mark] and Epi-Ambrox
… of the side chain in 219 with sodium methoxide in methanol gave compound 225 which was further converted into (-)-Ambrox® (2) by an identical sequence as for (-)-epi-Ambrox (3).
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The synthesis and reactivity of 6- and 8-azaindolizines.
… at C-3. Nucleophilic replacement of chlorine by methoxide from a 5-chloro-6-azaindolizine and a 7-chloro-8-azaindolizine occurred readily. Ammonolysis and hydrolysis were, however, only successful in the case of the former compound. These experimentally-determined sites of reactivity in 6- and 8- …
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