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Showing 1 to 20 of 40 for “"Naphthoquinone"”.
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Studies of 1,2-naphthoquinone mono-oximato complexes
The synthesis of 1,2-naphthoquinone I-oxime and 1,2- naphthoquinone 2-oxina complexes of rhodium and Iridium has been Investigated. In the case of rhodium, complexes of the type Rh(l-nqo)3 have been prepared by reacting 1 ,2-naphthoquinone 1-oxime with hydrated rhodium(III) chloride. Both products …
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1,2-naphthoquinone mono-oximato complexes of ruthenium
… the interaction of the sodium salts of the 112-naphthoquinone mono-oximes with hydrated ruthenium(III) chloride in aqueous tetrahydrofuran.
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In Vitro Investigation on Therapeutic Potential of Juglone, a Naphthoquinone from Walnuts against Pancreatic Cancer
Juglone, a naphthoquinone found in Juglandaceae family, which includes black walnut, European walnut, and butter nut possess various biological activities. The anti-cancer properties of juglone has been reported; however, the effect of juglone in pancreatic cancer (PC) has not been elucidated yet. …
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Studies of quinone monooximes derived from dihydroxyphenylalanines
… 1,6-dihydroxynaphthalene afforded 6-hydroxy-1,2-naphthoquinone 2-oxime as the main product together with some 6-hydroxy1,4-naphthoquinone 4-oxime as the 4-nitrosated compound, which were separated by using the chelating technique. For the 1,5- and 2,7-dihydroxynaphthalenes only one product …
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Studies of 1,2-quinone mono-oximato complexes and of their oxidation of amines
… of amine adducts of Cu(qo), where qoH = 1,2-naphthoquinone 1-oxime (1-nqoH), 1,2 naphthoquinone 2-oxime (2-nqoH), 4-chloro-1, 2-benzoquinone 2-oxime (4-ClqoH), 4-methyl-1, 2-benzoquinone 2-oxime (4-MeqoH) have been examined.
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Lewis Base Promoted Annulations of Allenoates with 1,4-Naphthoquinones
… easy to obtain starting materials such as 1,4-naphthoquinone is a significant goal of this project. Current research has been focused on cyclizing 1,4-naphthoquinone with varying allenoate substituents using triphenylphosphine as the Lewis base. This method has proven successful with yields up …
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Stereoisomerism of diphenyls : preparation and resolution of four substituted 2-methoxy-2'-nitro-6'-carboxydiphenyls ; salts of diiodomethane disulfonic acid ; synthesis of 2-mesityl-1, 4-naphthoquinone and its derivatives.
U of I Only Restriction set for Item 117776 on 2021-06-02T16:53:41Z with date by madinag@illinois.edu.
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Dermatophyte Respiration Antagonism in Vitro by Juglone
… unrelated diseases. Juglone, 5-hydroxy-1, 4-naphthoquinone, is a naturally occurring compound in walnut tree bark and walnut coverings. | History records the use of bark and shell covering extract in Greek medicine about 200 years before Christ. During the Revolutionary War it was used to …
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Design and synthesis of potential inhibitors of enzymes involved in the biosynthesis and utilisation of mycothiol
This thesis describes the synthesis of several naphthoquinone- and carbazole-1,4-quinone-derived conjugates of a mycothiol-like scaffold designed to act as redox cycling subversive substrates of the enzyme, Mtr, or potentially inhibit other mycothiol-dependent or biosynthetic enzymes, in order to …
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Lithium and indium quinoneoximic complexes and their application in scintillation counting
Several complexes of lithium derived from 1,2-naphthoquinone 1-oxime and 1,2-naphthoquinone 2-oxime have been prepared and characterised using analytical, spectroscopic and thermal gravimetric techniques. I.r. studies indicate that the ligands in these complexes are essentially quinoneoximic in …
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Synthesis of Crown Ether/Ammonium Salt for Electron Transfer Study
… synthesized which bear substituted quinone and naphthoquinone acceptor. The complexes characterization and preliminary electron transfer rate measurement were completed with UV/Vis and steady-state emission spectroscopy.
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Rethinking the dithiothreitol based PM oxidative potential: measuring DTT consumption versus ROS generation
… (9,10-phenanthrenequinone, 5-hydroxy-1,4-naphthoquinone, 1,2-naphthoquinone, 1,4-naphthoquinone) were tested to study the pattern of the generation of •OH. Metals such as copper(II), Manganese(II) and iron (II) which exist in the ambient particulate matter abundantly were also examined in …
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Development of a test system for screening toxic substances: a comparison using organic substances
… system. The toxicities of TEG, quinoline and naphthoquinone were compared for each sediment type. Toxicity was evluated in terms of the chemicals' effects on primary productivity and heterotrophic activity though other effects are also noted. The toxicity of the chemicals in this study was …
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The syntheses of some naturally derived naphthoquinones
… 8-acetyl-3-acetylamino-5,7-dihydroxy-1,4-naphthoquinone from benzoquinone by means of simple reactions including, Diels-Alder adduct formation, mild acetylation, oxime formation and Beckmann rearrangement in five steps with an overall yield of 22% is described in Chapter 1. The synthesis …
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Synthesis and characterization of molecules for electron transfer research.
… -(1,4-dimethoxynaphthyl)bromocyclohexane, was 1,4-naphthoquinone. After methylation and bromination, the Grignard reagent of the resulting bromide was reacted with cyclohexanedione, mono ethylene ketal. The resulting alcohol was changed to the donor precursor through the following functional group …
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Synthetic Studies Towards the Crisamicins
… towards the synthesis of the dimeric pyranonaphthoquinone antibiotic crisamicin A 1.46 and its regioisomer 2.77. The synthetic strategy adopted is based on a double furofuran annulation/oxidative rearrangement strategy that has been successfully used by this research group to prepare a …
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Aspects of the chemistry of 1,4-naphthoquinones. An investigation of nucleophilic substitution reactions of alkylamines and hydroxyalyklamines on 1,4 napthoquinones and the role of solvent on the position of substitution.
… and hydroxyalkylamines with 5-substituted-1,4-naphthoquinones have been studied. It has been found that the nature of the solvent employed in the reaction influences the position of mono-substitution at either the 2- or 3-position. Although both regioisomers were produced in all the reactions, …
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The synthesis of derivatives of naturally occurring naphthalenes
… and efficient synthesis of a substituted 1,4-naphthoquinone which would function as a model for the naphthoquinonoid nucleus of the rifamycin subclass of these antibiotics. In this synthesis, 1,4-benzoquinone was converted into 8- …
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Biomimetic synthesis of meroterpenoid natural products using dearomatization strategies
… α-ketol rearrangement reaction to form the naphthoquinone core of the napyradiomycins. The synthetic naphthomevalin was additionally converted into A80915G via a biomimetic Sɴ2 epoxidation reaction, and into napyradiomycin A1 via a chemoenzymatic reaction.
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Kinetics of electron transfer and binding of inhibitors in the two-electron gate of chloroplasts
… o-phenanthroline, cyanoacrylate derivatives, naphthoquinone analogues.
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