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Showing 1 to 20 of 99 for “"Quinones"”.
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Reactions of quinones with aromatic ethers.
The reactions between quinones and aromatic compounds in the presence of acids are surveyed; and a summary of the methods used for preparing triphenylenes is outlined. Mono- and di-arylquinones have been prepared by the arylation of benzoquinones with diazotised 3,4-dimethoxyaniline (Meerwein …
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The Synthesis and Reactivity of Vitamin E Quinones
… of the products of tocol oxidation: tocol quinones. Herein, an investigation of the adduct formation of tocol quinones with N-acetyl cysteine (NAC) is described. The synthesis of the tocopheryl quinones is described via the two-electron oxidation of the parent tocols with ceric ammonium …
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Characterization of Triggerable Quinones for the Development of Enzyme-Responsive Liposomes
… tissues), thus yielding a series of triggerable quinones to be used in the formation of enzyme-activated liposomes. The step-wise process to achieve the ultimate research objective includes: (1) measurement by cyclic voltammetry of–the electronic properties of naked, propionic acid quinones and …
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Synthesis, characterisation and application of novel quinones for the detection of latent fingermarks
… into the development of new fingermark reagents. Quinones have been used for the development of amino acids in chromatography and biochemistry. Recent research into the use of 2‐hydroxy‐1,4‐naphthoquinone (lawsone) has shown promising results for the development of latent fingermarks on porous …
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Total synthesis of Dan Shen diterpenoid quinones ; Synthesis and chemistry of (triakylsilyl)vinylketens
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
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Application of ketenes and allenes in the total synthesis of diterpene quinones and indoles
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
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Synthesis of side-chain-modified mycothiol analogues incorporating carbazole quinones, and evaluation as inhibitors of enzymes in the Mycobacteria
… of anti-TB activity associated with carbazole quinones such as B, led to the design and synthesis of a new class of hybrid molecules C which have the carbazole quinone motif tethered to the pseudodisaccharide core. The synthesis of these hybrid molecules involved initial preparation of …
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Characterization of the Electronic and Molecular Structures of Transition Metal Semiquinone and Catecholate Complexes
Quinones interact with transition metal ions in biological electron transfer processes such as photosynthesis and the respiratory electron transport chain. Two types of quinones exist, paraquinones and orthoquinones, however, only transition metal-orthoquinone complexes were studied. Orthoquinones …
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Mechanisms of antifatigue agents used in natural rubber
… roles as antifatigue agents. Among the evaluated quinones and phenols expected to have macroalkyl radical scavenging ability, BQ, αTOC, γTOC and GM showed relatively good performance for fatigue resistance (although their performance was slightly less effective than the commercial aromatic amine …
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Fullerene-acene chemistry: Part I Studies on the regioselective reduction of acenes and acene quinones; Part II Progress toward the synthesis of large acenes and their Diels-Alder chemistry with [60]fullerene
… regioselective reduction of acenes and acene quinones has been studied. Using hydriodic acid (HI) in acetic acid (HOAc) as reductant, it was found that acenes smaller than five rings reduce in a regioselective fashion. It was also found that phenyl substituted acenes with as many as seven …
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Heterogeneity of the Bc1 Complex Subunits and Qo Site Occupants From Rhodobacter Sphaeroides
… succinate-ubiquinone reductase and appropriate quinones was developed to characterize the best samples for crystallization based on enzymatic activity. The presence of all cofactors in bc1 complex is required for proper function and is required to be of equimolar stoichiometry to ensure …
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Rapid High-Throughput Screening Methods for Monitoring Electron Transfer Reactions in Biological Systems and Microalgae Phenotyping
… of environmental parameters and exogenous quinones in order to optimize electron extraction. To monitor electron extraction and donation to metabolites, a novel assay was created that monitored the chemiluminescence (CL) produced by superoxide radicals formed during the process. In …
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Health and social disparities influence opioid misuse among adult females living in rural areas
… from opium extracted from opium poppy plants (Quinones, 2015). Soon after a chemist invents a synthetic derivative of opium and names it diacetylmorphine (heroin) (Quinones, 2015, (Drugs and Morphine Text, 2018). Heroin originally was a safe cure for morphine addiction. Once this was proven to …
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THE STUDY OF PYRENEDIONE AS A PHOTOREDOX CATALYST AND A FLUOROMETRIC PROBE FOR VISUAL DETECTION AND QUANTIFICATION OF TRYPTOPHAN
Quinones are redox-active organic molecules that play significant roles in a wide range of chemical and biochemical redox processes. Pyrenediones (PYD) are poly aromatic quinones with extended conjugated structures which enable them to absorb light in the visible range. Their exceptionally strong …
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Novel quinone syntheses
… of the syntheses of a number of novel quinones. Chapter I deals with the syntheses of quinonoid derivatives of the compounds isobenzofuran and isoindole. These are the parent species of that series of heterocyclic compounds which contain a single heteroatom and are isoelectronic with …
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A Study of Novel Nitrogen-Containing Quinoidal Electrolytes for Redox Flow Batteries
… research chapter presents an investigation of quinones functionalised with aryl amines. 2,5-bis(4-carboxyanilino)-benzo-1,4-quinone was found to be the most promising example, retaining its electrochemical activity after reacting with hydroxide ions, the resultant molecule showing greater …
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L-Cysteine Effects on Chlorogenic Acid Quinone-Amino Acid Induced Greening and Browning: Mechanism and Effects on Antioxidant Capacity
… (TBA) derivatives when chlorogenic acid (CGA) quinones and amino acids react can be visually unappealing in some applications where CGA containing ingredients are used. Cysteine was studied as an amino acid anti-greening strategy, because cysteine-CGA conjugates are colorless. Buffered CGA: …
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