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Topic: Diketone

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	Process for preparing disubstituted furans (Site not responding. Last check: 2007-11-02)
		1-4 diketones, also known as gamma-diketones, constitute a recognized class of organic compounds, and methods for their preparation are well known to those skilled in the art.
		Optimal yields are obtained when the reactant diketone, diluted with an inert gas, such as nitrogen, is passed over the zeolite catalyst or through a bed of the catalyst at a temperature in the range about 100.degree.-500.degree.
		The reactant diketone was fed by means of a Sage syringe pump in a stream of nitrogen.
	www.stickebana.com /scitech/modem_with_power-off_ring_detection/process_preparing_disubstituted_furans.html (2392 words)

	Aryloxyalkyl diketones (Site not responding. Last check: 2007-11-02)
		Aryloxyalkyl diketones, useful as anti-viral agents, are prepared from an aryloxyalkyl halide and an alkali metal enolate salt of a diketone or keto-ester, or from a haloalkyl-diketone and an alkali metal salt of a phenol.
		This invention relates to aryloxyalkyl diketone and keto-esters, to the preparation thereof and to compositions and methods for the use thereof as anti-viral agents.
		3,829,475 discloses diketones and keto-esters of the formula RR'CH--Alk--Ar wherein R is acyl, R' is acyl or carboalkoxy, Alk is an alkylene bridge and Ar is phenyl or substituted phenyl, useful as pesticidal and anti-viral agents; no aryl ethers are disclosed.
	www.sacnewsmonthly.com /invent/animated_motion_display_machine/aryloxyalkyl_diketones.html (2895 words)

	Studies Related to a Synthetic Approach to the Solenolides
		Addition of lithium dimethylcuprate to the methyl ether 9 followed by attempts to trap the intermediate enolate with sulphoxide 7 in situ were unsuccessful, but this enolate could be trapped as the trimethylsilyl enol ether (Scheme 4).
		A brief study of the feasibility of an enantioselective reduction of diketone 11 was made, as this would represent a simple method for achieving an enantioselective synthesis of our desired target.
		It would appear from these preliminary experiments that, at least in principle, enantioselective reduction of a diketone such as 11 is possible in good enantiomeric excess (enantiomeric excesses estimated from proton nmr spectra in the presence of 3 equiv.
	www.ch.ic.ac.uk /ectoc/papers/24/gp1txt.html (1186 words)

	C&EN: CRITTER CHEMISTRY - THE CHEMISTRY OF SEXUAL DECEPTION
		A simple diketone emitted by the Australian orchid Chiloglottis trapeziformis elicits the amorous attention of the thynnine wasp Neozeleboria cryptoides.
		The orchids and wasps contain only nanogram amounts of the compound, and the team was not able to extract enough of it for nuclear magnetic resonance spectroscopy.
		The diketone's reactivity further limited the researchers, because it readily polymerizes at room temperature.
	pubs.acs.org /cen/critter/8144orchid.html (579 words)

	MBAA TQ - Today's diacetyl: the total vicinal diketone profile of beer. (Site not responding. Last check: 2007-11-02)
		The total vicinal diketone (TVDK) profiles of a range of commercial beers has been carried out to provide a market survey.
		Simple preparation procedures and an automatic gas chromatographic technique (ECD) was used to analyse 86 beers for diacetyl, 2,3-pentanedione, their respective precursors, 2-acetolactic acid and 2-acetohydroxy butyric acid and their products of reduction, acetoin and 3-hydroxy-2-pentanone.
		This technique can be used to assist in the identification of bacteria responsible for process problems.
	www.mbaa.com /TechQuarterly/Abstracts/1987/tq87ab06.htm (229 words)

	Diketone deodorant composition and method of deodorization - Patent 5441727
		Diketone deodorant composition and method of deodorization - Patent 5441727
		The laundry product compositions of the present invention are believed to be especially beneficial for reducing nonmicrobial malodorous substances that become absorbed into the fabric.
		Typically such laundry product compositions comprise from about 0,001% to about 20% of a 1,3 diketone deodorant agent.
	www.freepatentsonline.com /5441727.html (8777 words)

	Heart Cut - April 4, 2005 (Site not responding. Last check: 2007-11-02)
		A diketone linker masks primary amines on a solid support.
		The pyrrole structure could be easily cleaved to recover the free amine.
		The diketone linker reagent (1) was formed in five steps starting from the commercial resin TentaGel S-NH The efficiency of this method was demonstrated by reacting 1 with Fmoc-protected p-anisidine to form the pyrrole, then regenerating the free amine (2) with NH OH•HCl.
	www.acs.org /portal/a/c/s/1/acsdisplay.html?DOC=heartcut\archive\040405_heartcut.html (1172 words)

	US Grower and Distiller, Diamond Lotus Essentials(TM), Introduces Certified Organic Helichrysum Oil with High Diketone ...
		The most important components characteristic to Helichrysum oil are the diketones which are typically highest in the Corsican variety at about 4-10%.
		The Diamond Lotus Helichrysum oil has the highest diketone content ever reported with an estimated minimum 25% diketones (according to GC/MS conducted by Applied Essential Oil Research).
		The final essential oils are analyzed and tested by an independent, third party laboratory guaranteeing their purity, potency and efficacy.
	www.npicenter.com /anm/anmviewer.asp?a=14172&print=yes (389 words)

	Breaking the one antibody-one target axiom -- Guo et al. 103 (29): 11009 -- Proceedings of the National Academy of ...
		In previous studies (3, 5), we noted that a diketone linker-equipped
		2a and the conventional diketone 2c as a control.
		the diketone linker 7, as described in Fig.
	www.pnas.org /cgi/content/full/103/29/11009 (4309 words)

	Using antibody catalysis to study the outcome of multiple evolutionary trials of a chemical task -- Karlstrom et al. 97 ...
		immunization of mice with diketone haptens 1 and 2
		their specific binding to either of these diketones was abrogated.
		predisposed to bind the diketone haptens that we have studied
	www.pnas.org /cgi/content/full/97/8/3878 (3667 words)

	[No title] (Site not responding. Last check: 2007-11-02)
		Thus, compound 7 is mostly converted to diketone 8, while the desired compound 2 remains as an enantiopure hydroxyketone.
		Purification of the reaction mixture affords the desired hydroxyketone 2 plus diketone 8, which can be reconverted to the racemic mixture of compounds 2 and 7 to go through the kinetic resolution step again.
		Scheme 1 Once hydroxyketone 2 has been synthesized, it can then be alkylated and oxidized to the enone (3).
	www.cithep.caltech.edu /~jsm/Research.doc (788 words)

	Ascorbic acid - Wikipedia, the free encyclopedia
		Attack of ascorbic enol on proton to give 1,3-diketone
		Ascorbic acid also rapidly interconverts into two unstable diketone tautomers by proton transfer, although it is the most stable in the enol form.
		The proton of the enol is lost, and reacquired by electrons from the double bond, to produce a diketone.
	en.wikipedia.org /wiki/Ascorbic_acid (919 words)

	About diketone (Site not responding. Last check: 2007-11-02)
		After the deprotonation of diketone then it becomes diketonate (is this term correct?).
		O or C? In this resonance structure, as O is more electronegative, the e- density should be higher in both O atoms in time average than that of C. However, C is less electronegative, it is easier to donate e- to the proton than that of O. So, which factor is dominant?
		One more thing, if O abstracts the proton, an enol will be formed, and it becomes diketone again after tautomerization.
	www.chemicalforums.com /index.php?topic=5319.0 (328 words)

	WODCA - Tutorial B
		In a similar manner, a substructure search for generalized variations of the 2,4-pentanedione-precursor is performed.
		The following example shows the definition of a substructure query which is qualified to find such compounds in a catalog of chemicals by a substructure search.
		Again, the diketone precursor is activated by a single mouse click in the synthesis tree and is thereby exported to the WODCA main program (Figure 18:
	www2.chemie.uni-erlangen.de /software/wodca/tutorial-b.html (2081 words)

	Biochemical and molecular characterization of a periplasmic hydrolase for oxidized polyvinyl alcohol from Sphingomonas ...
		of the second enzyme, either a diketone hydrolase or an aldolase-type
		PVA 500 was 4 %, 10 mol diketone structures must exist
		PVA, but did not hydrolyse any mono- or diketones.
	mic.sgmjournals.org /cgi/content/full/151/4/1255 (4045 words)

	5-androstene Diketone (Site not responding. Last check: 2007-11-02)
		Our Small and Medium Size Business Supplier Bidding System™ ensures quality buyers meet quality sellers in the world.
		Click here to join us if you are 5-androstene Diketone manufacture/provider!
		Click here to request more about 5-androstene Diketone product and provider details!
	www.asia-sourcing.net /new-products/A-Z/5/5-androstene-Diketone.html (179 words)

	Neurofilaments Are Nonessential to the Pathogenesis of Toxicant-Induced Axonal Degeneration -- Stone et al. 21 (7): ...
		Sickles DW (1989b) Toxic neurofilamentous axonopathies and fast anterograde axonal transport.
		The effects of single doses of neurotoxic and non-neurotoxic diketones and B,B'-iminodipropionitrile (IDPN) on the rate and capacity of transport.
		Sickles DW (1991) Toxic neurofilamentous axonopathies and fast anterograde axonal transport.
	www.jneurosci.org /cgi/content/full/21/7/2278 (5176 words)

	Year 2004: ORGLIST:synthesis diketone (Site not responding. Last check: 2007-11-02)
		Date: Mon Mar 08 2004 - 22:32:22 EST
		I need the detail method (included temperature and condition) of synthesis diketone (Claissen Condensation) using methyl salicylic and acetophenone as starting material.
		Does anyone of you have the experience due to this topic?
	www.orglist.net /archive/2004/0076.html (95 words)

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