نتایج جستجو برای: hydroquinones

تعداد نتایج: 156  

Journal: :Rapid communications in mass spectrometry : RCM 2011
Iriux Almodóvar Oney Ramírez-Rodríguez Andrés Barriga Marcos Caroli Rezende Ramiro Araya-Maturana

The fragmentation patterns of nine di-, tri- and tetracyclic hydroquinones with potential antitumor activity were rationalized by invoking competing mechanisms that included sterically accelerated homolytic cleavage, Meerwein-type rearrangements and dehydrations through elimination or intramolecular nucleophilic substitution.

Journal: :Water Research 2021

Substituted para-benzoquinones and hydroquinones are ubiquitous transformation products that arise during oxidative water treatment of phenolic precursors, for example through ozonation or chlorination. The benzoquinone structural motive is associated with mutagenicity carcinogenicity, also induction the stress response Nrf2 pathway. For either endpoint, toxicological data differently substitut...

Journal: :Environmental microbiology 2006
Melissa R Suzuki Christopher G Hunt Carl J Houtman Zachary D Dalebroux Kenneth E Hammel

The fungi that cause brown rot of wood initiate lignocellulose breakdown with an extracellular Fenton system in which Fe(2+) and H(2)O(2) react to produce hydroxyl radicals (.OH), which then oxidize and cleave the wood holocellulose. One such fungus, Gloeophyllum trabeum, drives Fenton chemistry on defined media by reducing Fe(3+) and O(2) with two extracellular hydroquinones, 2,5-dimethoxyhydr...

Journal: :Chemical Society reviews 2012
Peter J Cragg Kushal Sharma

Pillar[5]arenes are [1(5)]paracyclophane derivatives consisting of 1,4-disubstituted hydroquinones linked by methylene bridges in the 2,5-positions. The first report of these novel macrocycles was in 2008, when 1,4-dimethoxypillar[5]arene was prepared in 22% yield, and subsequent improvements in synthetic methods have allowed the number of derivatives to expand significantly. In addition to D(5...

Journal: :Denki Kagaku oyobi Kogyo Butsuri Kagaku 1994

Journal: :Zeitschrift fur Naturforschung. C, Journal of biosciences 1999
N Mihopoulos C Vagias I Chinou C Roussakis M Scoullos C Harvala V Roussis

In order to check the structure-activity relationship and find more potent derivatives of the natural products 1 and 2 obtained from sponge Ircinia spinosula, a series of oxidation, hydrogenation, acetylation and methylation derivatives was prepared. All compounds (natural and synthetic ones) were screened for their cytotoxic and antibacterial activities. The biological studies showed a wide ra...

Journal: :Chemical communications 2013
Kelly A Volp Andrew M Harned

Molecular modelling of an iodine(III) phenoxide was used as a starting point in the design of chiral aryl iodide catalysts for stereoselective oxidative dearomatization reactions. Using this approach, catalysts derived from 8-iodotetralone and tartaric acid were constructed and used to synthesize enantioenriched para-quinols from phenols.

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