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Showing 1 to 20 of 61 for “"halogenation"”.
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Sustainable strategies for alcohol halogenation
… the efficiency of alcohol activation towards halogenation, with respect to halide waste generation. Though many organocatalytic routes to alcohol halogenation have been developed, these methods often require the use of polyhalogenated starting materials, generating a super-stoichiometric …
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Pyrohydrolytic de-halogenation of electric arc furnace dusts
Includes bibliographical references (pages 200-204).
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Crystallographic studies on enzymatic halogenation of natural products
… the molecule's potency and selectivity, making halogenation an important tailoring reaction. To understand the mechanisms of enzymatic halogenation of natural products, X-ray crystallography was used to solve structures of enzymes from two classes of halogenases, the flavin-dependent halogenases …
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Studies on the Mechanism of the Halogenation Reactions Catalyzed by Chloroperoxidase
Made available in DSpace on 2014-12-09T17:36:18Z (GMT). No. of bitstreams: 1 6910864.pdf: 6006461 bytes, checksum: 29370b4f6e2f2dbbaaf3b6c21b14556c (MD5) Previous issue date: 1968
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Boron Subnaphthalocyanines: The First Unsubstituted Examples, New Boron Lewis Acids, Random Bay Position Halogenation, and Computational Material Screening
… properties on the frequency of bay position halogenation and developed improved analytical techniques for this class of materials. We also present a new method for the synthesis of BsubNcs that circumvents the generation of bay position halogenated species, resulting in the first examples of …
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Two versatile cofactors, flavin adenine dinucleotide and non-heme iron, involved in DNA repair and natural product halogenation
… oxygen as an oxidizing agent, can perform halogenation chemistry. Flavin-dependent halogenasess perform halogenation reactions on aromatic substrates, while non-heme iron-dependent halogenases perform halogenations reactions on unactivated aliphatic substrates. I is a flavin-dependent …
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Asymmetric Lewis base catalysis: I. Lewis base catalyzed halogenation and development of an enantioselective bromocycloetherification reaction; II. enantioselective addition of silyl ketene imines to carbonyl electrophiles
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-06-15T13:39:00Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Thesis-6-12.docx: 11084823 bytes, checksum: 0609048b408ae3adf1f485e3a9dde5d3 (MD5) Burk_Matthew.pdf: 14255171 bytes, …
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Synthetic Design of Multiphase Systems for Advanced Polymeric Materials
… synergistic manner. In this work, we detail the halogenation of poly(ether ether ketone) (PEEK) through both solution-state and gel-state functionalization methods. The multiphase gel-state chemistry restricts functionalization to the amorphous regions of the semi-crystalline parent homopolymer …
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The Synthesis of 5-[(P-Hydroxyphenyl)-2, 4, 6-Tricarbethoxy]-Cyclohexanedione-1, 3.
… alkylation, acylation, Grignard, Reformatsky, halogenation, and many other type reactions.
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THREE STUDIES OF 2-PYRIDONE PHOTOADDUCT REACTIVITY
… adducts, three studies have been conducted. Halogenation of trans iv give rearranged i. Cope rearrangement of cis v gives vi which can undergo retro-Mannich reaction to yield unsymmtrically coupled piperidines vii. Pyridones can also undergo photo-[4+4] reactions with furans. Cycloaddition of …
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Site-selective C-H Bond Diversification of Glycosides
… functionalization: 1) site-selective halogenation & derivatization of sugars, 2) expedient synthesis of L-glucose and 3) diastereoselective C-H alkylation of sugars. These radical-based transformations harness polarity compatibility between the hydrogen atom abstractor and the …
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Reagents and Strategies for the Total Synthesis of Halogenated Natural Products
… halonium-induced polyene cyclization, asymmetric halogenation, and medium-ring haloether formation would facilitate access to hundreds of halogenated natural products, but these reactions have traditionally proven challenging. Chapter 2. The Discovery of BDSB and Initial Investigations into …
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Lithiation of Oxy-Arenes; New Methodology for Electrophilic Aromatic Substitutions: Attempted Synthesis of Thiaheptalenes and Heterocyclic Pyrene Systems
… 1,2-dichloro-tetrafluoroethane were used for the halogenation of the lithiated positions. These remote lithiation reactions are useful in the synthesis of theoretically interesting heterocyclic heptalene and pyrene systems.
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Purification and characterization of methyl chloride transferase: A novel halogenating enzyme
… is the hydrogen peroxide-dependent halogenation mechanism common to haloperoxidase enzymes such as chloroperoxidase. No production of monohalomethanes can be detected by the haloperoxidase mechanism. The white rot fungus, Phellinus pomaceus has been known to produce methyl chloride …
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Structural effects of chloraminated seawater on the SW30HR reverse osmosis membrane
… of reverse osmosis membrane polymers including halogenation of the polyamide active layer and polysulfone support near the interface with the active layer.
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Fluorescent chemosensors for exploring zinc metalloneurochemistry and detecting mercury in aqueous solution
… The effects of electronic variation, achieved by halogenation of either the zinc-binding unit or the fluorophore platform, on the fluorescence properties and aniline nitrogen atom pKa values are considered.
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Theoretical And Experimental Studies Of Noncovalent Metal Cation Binding And Base Pairing Interactions Of Cytosine And Modified Cytosines
… of cytosine, such as methylation and halogenation, can influence the binding modes or the strength of the base-pairing interactions. The IRMPD action spectroscopy of four proton-bound homodimers, (5<i>x</i>C)H<sup>+</sup>(5<i>x</i>C), where <i>x</i> = H, F, Br, and Me, and three …
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Total synthesis of macrocyclic bisbibenzyl natural products
… and, in the case of cavicularin, regioselective halogenation and radical induced transannular ring contraction. This work also furnished a number of highly strained macrocycles as precursors to the natural products. These structures were found to contain boat-shaped aromatic rings, in addition to …
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Optimalisation de la radiosynthèse et production au niveau de la curie d'acides aminés aromatiques marqués au fluor-18
… and the subsequent conversion (reduction and halogenation) into benzyl halides was directly realized, on-line, on the support. Reduction of the aldehydes and the following halogenation step were performed with an aqueous solution of NaBH4 and aqueous solutions of concentrated acid (HI, HBr, …
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Characterizing peptide-modifying enzyme activity in RiPP biosynthesis
… activity was further leveraged to demonstrate halogenation capability on various non-native RiPP precursor peptides, pharmacologically relevant peptides, and even on a folded protein. Molecular dynamics simulations support the role of a C-terminal motif in substrate engagement, and lay the …
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