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Showing 1 to 20 of 49 for “"Sulfones"”.
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Synthesis and characteristics of polyarylene ether sulfones
… polycarbonate and several poly(arylether sulfones) were synthesized from well characterized oligomers. It was possible to prepare one or two phase block copolymers by controlling the molecular weights and/or interaction parameters of the parent oligomers. Surface characterization showed …
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Kinetics of base-catalyzed isomerization and hydration of butadiene sulfones
… isomerization and hydration of butadiene sulfones has been studied by using the gas chromatographic method. The reaction has been shown to be first-order with respect to each of the three components, i.e., α-butadiene sulfone, β-butadiene sulfone, and alcohol, in this complex reaction …
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Peptide vinyl sulfones : inhibitors and active site probes for the study of proteasome function in vivo
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1997.
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TRANSITION METAL CATALYZED CROSS-COUPLINGS OF ALKYL SULFONE ELECTROPHILES
Sulfones are an important class of organic molecules that can participate in a wide variety of synthetic transformations. For this reason, they have been described as chemical chameleons. While their use as Csp2 electrophiles in cross-coupling dates to the early 1970’s, their potential as competent …
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Synthesis and Evaluation of New Antimicrobial Agents and Novel Organic Fluorophores
… improve the activity of the zinc salts. Organosulfones are widely used in the field of pharmaceuticals and ploymers. Traditional methodologies for synthesizing biphenyl sulfones include Suzuki-Miyaura coupling, Friedel-Crafts and other multistep reactions. These methodologies require catalysts, …
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ΜΕΘΟΔΟΙ ΑΠΟΘΕΙΩΣΗΣ ΠΡΟΙΟΝΤΩΝ ΠΕΤΡΕΛΑΙΟΥ ΧΩΡΙΣ ΚΑΤΑΛΥΤΗ ΚΑΙ ΥΔΡΟΓΟΝΟ
… OF THE SULFUR COMPOUNDS OF PETROLEUM TO SULFONES (R-[S02]-R'). THE EXTRACTION OF THE OXIDIZED PRODUCTS WITH NMP AND DMF GAVE BETTER RESULTS THAN BEFORE BECAUSE OF THE INCREASED POLARITY OF THE SULFONES. WE ALSO FOUND THAT DESULFURIZATION WAS POSSIBLE BY USING SEVERAL POLAR EXTRACTION …
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Reactions and properties of the isomeric dihydrothiophene 1, 1- dioxides
… of a large group of five-membered cyclic β-sulfones while the 2,3-dihydrothiophene 1,1-dioxide (II) is the parent member of the corresponding α-sulfones. Structurally, I contains a carbon-carbon double bond, a sulfone group and two α-methylene groups while II only has one α-methylene group …
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Derivatives of 1-(3-methoxy-4-acetoxyphenyl)-2,6-dicarbethoxy-cyclohexanedione-3,5
… further research in the two fields of dyes and sulfones. It is known that some dyes are of pharmaceutical as well as industrial importance, such as prontosil. Lately sulfones have attracted more attention since 4,4'-diamino-diphenylsulfone has been shown to have effect against tuberculosis and …
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Investigation of catalyst effects in enantioselective copper- and rhodium-mediated transformations of α-diazocarbonyl compounds
… and C–H insertion reactions of α-diazo-β-keto sulfones leading to α-sulfonyl cyclopentanones as the major product. Detailed investigation of the impact of substrate structure (both the sulfonyl substitutent and the substituent at the site of insertion), the copper source, ligand, counterion, …
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Synthesis and characterization of poly(arylene ethers) and functionalized oligomers
… endgroup functionalization in poly(arylene ether sulfones) has been achieved by two synthetic routes. The first utilizes DMSO/sodium hydroxide and aminophenol to introduce the amine functionality. This route, though synthetically useful, suffers from serious limitations, such as hydrolytic side …
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Organocatalytic asymmetric mannich-type reactions: an easy approach to optically active amine derivatives
… compounds. For this purpose we used α-amido sulfones, bench stable white crystalline solids, as imine precursors (Scheme II). In particular we were able to obtain the aza-Henry adducts, by using chiral phase transfer catalysis, with a broad range of substituents as R-group and excellent …
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Synthesis and Characterization of Phosphine Oxide Containing Monomers and of the Flame Resistant Polymers Prepared Therefrom
… poly(arylene ether ketones) poly(arylene ether sulfones) and poly(arylene ether phosphine oxides) were. Internal and external fire testing methodologies showed that the new polymers containing phosphine oxide units were fire resistant while maintaining the desirable physical characteristics of …
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Oxidation & 1, 5-hydride shift of sulfoximine derivatives
… sulfoximines using dimethyldioxirane gave sulfones and nitroso derivatives. A mechanism for the process was proposed. Thermal isomerization and decomposition of different N-substituted and S-alkenyl sulfoximines was studied. Cyclic sulfoximines and N-H sulfoximines were obtained. Reactivity …
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Synthetic and stereochemical aspects of enantioselective copper catalysed C-H insertion reactions leading to cyclopentanones and sultones
… compounds including α-diazoβ-keto sulfones, α-diazo-β-keto phosphine oxides, 2-diazo-1,3-diketones and αdiazosulfonates, and their reactivity in intramolecular copper–bis(oxazoline)–NaBARF catalysed C–H insertion reactions. Excellent enantioselectivities of up to 91% ee were …
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Fluorinated Organic Molecules for Medicinal Applications
… α,α-difluoromethyl sulfones, ?-deutero-α,α-difluoromethyl sulfones, monofluoro α-hydroxy ketones and α,α-difluorohalohydrins. </p> <p>We also endeavored to design and synthesize fluorinated molecules for biological applications. Our efforts were aimed at the use of a …
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Study of the application of the high performance liquid chromatography-particle beam interface-mass spectrometry technique on some pesiticides and the reduction phenomena in the system
… included in them are: quinones, sulfoxides, and sulfones.
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Synthesis of Cylindricine C and its Stereoisomers
… these compounds from natural sources. Acetylenic sulfones have been used by our group in the synthesis of numerous nitrogen-containing heterocycles. We have applied our acetylenic sulfone methodology to the synthesis of 2,13-di-epi-cylindricine C and cylindricine C by employing a tandem conjugate …
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