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Topic: Naphthoquinone


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In the News (Fri 16 Aug 19)

  
  Process for removing naphthoquinone from phthalic anhydride produced through air oxidation of naphthalene - Patent ...
More specifically, the undesirable byproduct naphthoquinone is effectively removed from crude phthalic anhydride by treating the crude phthalic anhydride with small quantities of polymeric oils containing several double bonds optionally in the presence of alkali.
Because naphthoquinone is within the boiling range of phthalic anhydride, its presence diminishes the color and purity of the phthalic anhydride.
Thus the effective removal of naphthoquinone from crude phthalic anhydride is surprisingly achieved by treating crude phthalic anhydride containing naphthoquinone at a temperature of 180.degree.-280.degree.
www.freepatentsonline.com /4547578.html   (2178 words)

  
 1,2-NAPHTHYLQUINONE (BETA-NAPHTHOQUINONE)
Naphthoquinone is the fundamental ring structure that is related with vitamin K activity, which can be formed by addition of long side chain substituents.
A naphthoquinone compound with prenyl units side cnain at 3 position and methyl group at 2 position is Vitamin K
In industrial field, naphthoquinone is used as a rubber (and polyester resins) polymerization regulator.
www.chemicalland21.com /specialtychem/finechem/1,2-NAPHTHYLQUINONE.htm   (154 words)

  
 Development of Polyclonal Antibodies for Detection of Protein Modification by 1,2-Naphthoquinone   (Site not responding. Last check: 2007-10-16)
Naphthoquinones have been reported to be toxic to liver cells in vitro.
In addition, 1,2-naphthoquinone was found to bind covalently to cysteine residues of proteins of lung Clara cells incubated with naphthalene.
To further identify the target proteins of the naphthoquinone, we raised polyclonal antibodies by immunizing rabbits with 1,2-naphthoquinone protein adducts.
pubs.acs.org /cgi-bin/abstract.cgi/crtoec/1996/9/i05/abs/tx960014b.html   (294 words)

  
 Structure, absolute stereochemistry, and synthesis of conocurvone, a potent, novel HIV-inhibitory naphthoquinone trimer ...   (Site not responding. Last check: 2007-10-16)
Bioassay-guided fractionation provided conocurvone (1), a novel trimeric naphthoquinone derivative, as the active anti-HIV constituent of an extract from a Conospermum sp.
The related naphthoquinone monomer teretifolione B (2) also was isolated from a Conospermum sp.
While compound 2 was inactive against HIV, the natural and synthetic conocurvone (1) and the synthetic trimeric analog 4 were all active and equipotent, preventing the cytopathic effects and replication of HIV in human T-lymphoblastic cells (CEM-SS) over a concentration range of 0.02-50 µM. Up to MTDP References
home.ncifcrf.gov /mtdp/Catalog/abstract/abs193.html   (186 words)

  
 Naphthoquinone derivatives - Patent 5053432
Other of the compounds exhibit a very good activity against theilerial parasites and are notable for their activity against both T.parvum and T.annulata, exhibiting a higher activity than naphthoquinones previously noted as anti-theilerial agents.
It will be appreciated that the compounds of formula (I) wherein R.sup.1 is hydrogen may exist as cis or trans isomers, that is to say that the cyclohexyl ring may be cis or trans substituted by the naphthoquinone nucleus and the group R.sup.2.
The naphthoquinone was suspended in 0.25% (w/v) celacol in water by milling for 16-24 hours at 26.degree.
www.freepatentsonline.com /5053432.html   (6057 words)

  
 Chemistry - Vitamin K
Normally it is produced by bacteria in the intestines, and dietary deficiency is extremely rare unless the intestines are heavily damaged.
Vitamin K is a group name for a number of related compounds, which have in common a methylated naphthoquinone ring structure, and which vary in the aliphatic side chain attached at the 3-position (see figure 1).
It is generally accepted that the naphthoquinone is the functional group, so that the mechanism of action is similar for all K-vitamins.
www.chemistrydaily.com /chemistry/Naphthoquinone   (775 words)

  
 BIP - Plumbagin production by root cultures of Plumbago rosea.
Plumbagin (2-methoxy-5-hydroxy-1,4-naphthoquinone) is a natural naphthoquinone possessing various pharmacological activities i.e.
BUDZIANOWSKI, J. Naphthoquinone glucosides of Drosera gigantea from in vitro cultures.
DIDRY, N.; DUBREVIL, L. and PINKAS, M. Activity of anthraquinonic and naphthoquinonic compounds on oral bacteria.
www.ejbiotechnology.info /content/vol5/issue3/full/4/bip   (1649 words)

  
 Activities and Conformational Fitting of 1,4-Naphthoquinone Derivatives and Other Cyclic 1,4-Diones Tested In Vitro ...
were selected from a large pool of naphthoquinones by means of
to or eclipsing C2 of the naphthoquinone, with respect to the
Conformational and electrostatic properties of naphthazarin, juglone, and naphthoquinone: an ab initio theoretical study.
aac.asm.org /cgi/content/full/45/5/1473   (2722 words)

  
 Novel hydroxyl naphthoquinones with potent Cdc25 antagonizing and growth inhibitory properties -- Peyregne et al. 4 ...
Novel hydroxyl naphthoquinones with potent Cdc25 antagonizing and growth inhibitory properties -- Peyregne et al.
Novel hydroxyl naphthoquinones with potent Cdc25 antagonizing and growth inhibitory properties
95397 and the well-studied naphthoquinone derivative, Cpd 5.
mct.aacrjournals.org /cgi/content/full/4/4/595   (4089 words)

  
 Effects of Atovaquone and Diospyrin-Based Drugs on Ubiquinone Biosynthesis in Pneumocystis carinii Organisms -- ...
The naphthoquinone atovaquone is effective against Plasmodium and Pneumocystis carinii carinii.
Effects of naphthoquinone drugs on incorporation in vitro of radiolabeled p-hydroxybenzoate into P.
Inhibition of ubiquinone biosynthesis was not observed at concentrations of these naphthoquinone drugs up to 100 µM. Top
aac.asm.org /cgi/content/full/44/1/14   (3188 words)

  
 Imaging On-Line Store   (Site not responding. Last check: 2007-10-16)
A novel class of the naphthoquinone derivative, 2-phenyl-3- substituted carbonyl-1,4-naphthoquinone (PNQ), has been developed as a sensitizer for a single-layer organic photoconductor (OPC) for positive charging.
Unsymmetric substituents in 2- and 3-positions of naphthoquinone enabled PNQ to have a good compatibility into a binder resin, and PNQ could perform to function more effectively as a sensitizer than naphthoquinone.
In fact, it was confirmed that the addition of PNQ to a single-layer OPC made the photosensitivity improved.
www.imaging.org /store/epub.cfm?abstrid=449   (156 words)

  
 Quinone.com
We are the largest manufacturer of naphthoquinone in the world, and supplying our products to customers all over the world.
We have experienced joint works with many companies of various fields and have experiences of study to synthesize more than 900 derivatives.
Derivatives of naphthoquinone and anthraquinone have various biochemical characteristics (bioactivities) and have the wide application for medicines, pesticides, etc. And derivatives of naphthalene and anthracene as electronic materials, by utilizing its response to light.
www.quinone.com /index.html   (348 words)

  
 NAD(P)H:menadione oxidoreductase of the amitochondriate eukaryote Giardia lamblia: a simpler homologue of the ...
The purified recombinant protein reduced menadione and naphthoquinone
concentration of menadione or naphthoquinone at constant concentrations
NADH in the presence of naphthoquinone and the reaction was
mic.sgmjournals.org /cgi/content/full/147/3/561   (4390 words)

  
 Honest Bio-Vet Manufacturers K3 Vitamins
(2 – methyl – 1,4 – naphthoquinone 3 – pyridine – Carboxyli – acid - amide bisulfite)
(2 - methyl - 1,4 - naphthoquinone 2 - hydroxy -
(2 - methyl - 1,4 - naphthoquinone Sodium bisulfite)
www.honestbiovet.com /products.html   (94 words)

  
 The Crystal Structure and Physicochemical Characteristics of 2-Hydroxy-N-[3(5)-pyrazolyl]-1,4-naphthoquinone-4-imine, a ...
Our interest in quinone chemistry prompted us to give special attention to the synthesis and biological properties of pyrazolylnaphthoquinones, a new class of naphthoquinone derivatives, finding that 2-Hydroxy-N-[3(5)-pyrazolyl]-1,4-naphthoquinone-4-imine (PNQ) exhibits promising activity against T.
At present, the study of the solid state properties of new substances is essential for the development and approval of novel drug compounds
Furthermore, the CO stretch of the carbonyl in the naphthoquinone was observed at 1694 cm
www.aapspharmscitech.org /view.asp?art=pt060482   (4400 words)

  
 [Quinone.com] List of structural formulas [Naphthoquinones / Naphthalenes]
KAWASAKI KASEI CHEMICALS LTD. is the largest company that produces naphthoquinone, all over the world.
We, KAWASAKI KASEI CHEMICALS LTD., have studied and synthesized derivatives of naphthoquinone and naphthalene for several decades.
And our aromatic compounds have been utilized over wide field.
www.quinone.com /ver1_0/e/list_e/list_naph01_e.html   (104 words)

  
 LIGHT-SENSITIVE NAPHTHOQUINONE DIAZIDE COMPOSITION CONTAINING A POLYVINYL ETHER (US3634082)   (Site not responding. Last check: 2007-10-16)
LIGHT-SENSITIVE NAPHTHOQUINONE DIAZIDE COMPOSITION CONTAINING A POLYVINYL ETHER (US3634082)
Go to Result Set: All U.S. references
LIGHT-SENSITIVE NAPHTHOQUINONE DIAZIDE COMPOSITION AND MATERIAL CONTAINING AN ALKALI INSOLUBLE POLYMER
www.delphion.com /details?pn10=US03634082   (234 words)

  
 1 4 Naphthoquinone cas 130 15 4 FOR SALE in ShenZhen Hong Kong Island East @ Adpost.com Classifieds > Australia > 1 4 ...
1 4 Naphthoquinone cas 130 15 4 FOR SALE in ShenZhen Hong Kong Island East @ Adpost.com Classifieds > Australia > 1 4 Naphthoquinone cas 130 15 4 FOR SALE in ShenZhen Hong Kong Island East,free,australian,classified ad,classified ads,secondhand,second hand
1 4 Naphthoquinone cas 130 15 4 FOR SALE in ShenZhen Hong Kong Island East @ Adpost.com Classifieds
Content copyright © 2006 Adpost.com 1 4 Naphthoquinone cas 130 15 4 FOR SALE in ShenZhen Hong Kong Island East
www.adpost.com /au/cameras_optics/2292   (153 words)

  
 PHOTOSENSITIVE LITHOGRAPHIC NAPHTHOQUINONE DIAZIDE PRINTING PLATE WITH ALUMINUM BASE (US3802885)
News, Profiles, Stocks and More about this company
COPYING MATERIAL FOR USE IN THE PHOTOCHEMICAL PREPARATION OF PRINTING PLATES
LIGHT-SENSITIVE NAPHTHOQUINONE DIAZIDE COMPOSITION CONTAINING A POLYVINYL ETHER
www.delphion.com /details?pn10=US03802885   (197 words)

  
 (WO/1992/013532) NAPHTHOQUINONE DERIVATIVES FOR THE TREATMENT OF CHRONIC INFLAMMATION   (Site not responding. Last check: 2007-10-16)
(WO/1992/013532) NAPHTHOQUINONE DERIVATIVES FOR THE TREATMENT OF CHRONIC INFLAMMATION
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(EN) NAPHTHOQUINONE DERIVATIVES FOR THE TREATMENT OF CHRONIC INFLAMMATION
www.wipo.int /pctdb/en/wo.jsp?WO=1992/13532   (236 words)

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