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Topic: Cyclohexene

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Cyclohexanol

Cyclohexane

Benzene

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Cyclohexanol

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	Reaction of Bromine with Cyclohexane, Cyclohexene, and Benzene
		Reaction of Bromine with Cyclohexane, Cyclohexene, and Benzene
		Cyclohexane is added to the first tube, cyclohexene to the second, and benzene to the third.
		Alkenes like cyclohexene undergo addition reactions with bromine to produce dibromoalkanes.
	jchemed.chem.wisc.edu /JCESoft/CCA/CCA5/MAIN/1ORGANIC/ORG08/TRAM08/B/0212801/THUMBS.HTM (122 words)

	Vinyl Cyclohexene Dioxide
		Effects on Animals: Vinyl cyclohexene dioxide is a severe irritant, a mutagen and a carcinogen in experimental animals.
		Before a worker is placed in a job with a potential for exposure to vinyl cyclohexene dioxide, a licensed health care professional should evaluate and document the worker's baseline health status with thorough medical, environmental, and occupational histories, a physical examination, and physiologic and laboratory tests appropriate for the anticipated occupational risks.
		Clothing contaminated with vinyl cyclohexene dioxide should be removed immediately, and provisions should be made for the safe removal of the chemical from the clothing.
	www.osha.gov /SLTC/healthguidelines/vinylcyclohexenedioxide/recognition.html (3331 words)

	CHM235L - Exp. 5 Alcohol Dehydration of Cyclohexanol to Cyclohexene
		Since the cyclohexene and cyclohexanol exist in equilibrium, it is difficult to convert all the cyclohexanol to cyclohexene.
		Cyclohexene and water are removed from the distilling flask as an azeotrope (see appendix) by fractional distillation as the reaction progresses.
		Cyclohexene is very volatile and it will evaporate very rapidly if left open to the air.
	jan.ucc.nau.edu /~jkn/235L5-Dehydration.htm (1656 words)

	Reaction of Cyclohexene with Bromine and Potassium Permanganate
		Reaction of Cyclohexene with Bromine and Potassium Permanganate
		Cyclohexene reacts with both aqueous bromine and permanganate.
		Since a syn-hydroxylation takes place, the reaction is thought to involve the formation of an intermediate cyclic manganate ester which is readily hydrolysed under the reaction conditions to yield the glycol.
	www.uni-regensburg.de /Fakultaeten/nat_Fak_IV/Organische_Chemie/Didaktik/Keusch/D-Addit_ar-e.htm (228 words)

	index/mm (Site not responding. Last check: 2007-10-31)
		The purpose of this lab is to test the reactivity of the alkanes, using cyclohexane as an example since it has virtually the same reactions as hexane and is very similar to other alkanes.
		Then to compare the results with the reactivity of the alkenes, using cyclohexene as an example since it has virtually the same reactions as hexene and is very similar to other alkenes.
		Cyclohexene (both cyclohexane and cyclohexene are common hydrocarbons and are safe to use).
	www.owlnet.rice.edu /~chem122/lab/introorg(!) (821 words)

	[No title]
		In the case of cyclohexene preparation, rearrangement of the carbonium ion can lead to the same structure, so a single alkene is conveniently obtained by this simple method of dehydration.
		Finally, the removal of cyclohexene from the reaction mixture as rapidly as formed is desirable for two reasons: the equilibrium is shifted forward, and the acid-catalysed polymerization of the alkene is minimized.
		Removal of both cyclohexene and water from the reaction mixture is accomplished by carrying out the reaction under a fractionating column and adjusting the heat so that there is slow fractional steam distillation.
	www.keiheep.edu.hk /~chem/al/dehydrat.doc (904 words)

	[No title]
		The actual yield and the theoretical yield of cyclohexene can be used to determine the percent yield for the dehydration reaction.
		The number of drops of Br2 solution needed to convert 50 mg of a pure cyclohexene sample to the dibromide will be compared to the number of drops of Br2 solution needed to convert 50 mg of your cyclohexene sample to the dibromide.
		Use this result to calculate the actual yield of cyclohexene for the dehydration reaction.
	www.gpc.edu /~jpoteat/2641Lbrominationcyclohexene.doc (313 words)

	1,3- and 1,4-cyclohexadiene reaction intermediates in cyclohexene hydrogenation and dehydrogenation on Pt(111) crystal ... (Site not responding. Last check: 2007-10-31)
		The hydrogenation and dehydrogenation reactions of cyclohexene on Pt(111) surface were investigated by surface vibrational spectroscopy via sum frequency generation (SFG) both under ultrahigh vacuum (UHV) and high pressure conditions with 10 Torr cyclohexene and various hydrogen pressures up to 590 Torr.
		Under UHV, cyclohexene on Pt(111) undergoes a change from @p/@s-bonded, @s-bonded, and c-C"6H"9 surface species to adsorbed benzene when the surface was heated.
		A site-blocking effect was observed at saturation coverage of cyclohexene and caused the dehydrogenation to shift to higher surface temperature.
	www.aapspharmaceutica.com /search/view.asp?ID=16254 (356 words)

	Literature Review
		(2003) used a 39-parallel-channel microreactor for vapor-phase catalytic hydrogenation and dehydrogenation of cyclohexene to cyclopean and benzene, respectively.
		The group etched 100µm by 100µm square channels in silicon and coated them with a 20nm thick, non-porous platinum film via vacuum sputtering.
		(2001) performed liquid-phase hydrogenation of cyclohexene to cyclohexane in a 10-parallel-channel microreactor whose 625µm wide, 300µm deep channels were packed with Pt/Al particles (53-74µm diameter, 0.57 m
	www.stevens.edu /engineering/cbme/UG/sdp/khadine/page4.html (450 words)

	Preparation of cyclohexene from cyclohexanol.
		In this experiment an alkene (cyclohexene) will be prepared by dehydration of an alcohol (cyclohexanol) using an acid catalyst such as phosphoric acid.
		Transfer the cyclohexene into a clean dry conical flask and add a spatula full of calcium chloride.
		Immediately stopper the tube with a cork and discard the drying agent and cotton wool into the waste containers which are in the fume hood.
	wwwchem.uwimona.edu.jm:1104 /lab_manuals/c10expt8.html (774 words)

	Process for hydrogenation of damascenone, products produced thereby and organoleptic uses of said products - Patent ...
		Described is a process for preparing hydrogenated derivatives of 2,6,6-trimethyl cyclohexene derivatives by means of treating said derivatives with hydrogen in the presence of a supported palladium catalyst such as palladium-on-calcium carbonate or palladium-on-barium sulfate in the presence of a quinoline activator.
		Thus, the butenoyl and/or butanoyl cyclohexane and cyclohexene compounds or mixtures thereof of our invention can be used to alter, modify or enhance the aroma characteristics of a perfume composition, for example, by utilizing or moderating the olfactory reaction contributed by another ingredient in the composition.
		The amount of butenoyl and/or butanoyl cyclohexane and cyclohexene compounds or mixtures thereof of our invention which will be effective in perfume compositions as well as in perfumed articles and colognes depends on many factors, including the other ingredients, their amounts and the effects which are desired.
	www.freepatentsonline.com /4324704.html (7574 words)

	Addition of HCl to Cyclohexene
		The reaction is the electrophilic addition of hydrogen chloride to cyclohexene.
		Place approximately 25 ml of cyclohexene in a separatory funnel with 10ml of pentane, which makes the reaction proceed rapidly.
		Refer to the MSDS sheets for precautionary measures to use when handling hydrocholoric acid, pentane, and cyclohexene.
	sankofa.loc.edu /dharris/web/journal/TORSHAW.HTML (462 words)

	[No title] (Site not responding. Last check: 2007-10-31)
		You should note that since this is a cyclohexene ring, it is an approximation to show the product in "chair" and "boat" conformations.
		The trans-trans diene will react with the trans-dienophile to give a cyclohexene in an approximate "boat" conformation.
		This will rapidly convert to the more stable "chair" conformation, placing (for the diene) the methyl groups of the diene 1,4-equatorial-axial, or cis- relative to each other (trans-trans yields cis-), and the methyl groups of the dienophile 1,2-diequatorial or trans- relative to each other (trans-dienophile yields trans-product).
	www.chem.uic.edu /web1/OCOL-II/WIN/CH14/15A/15ACANS.HTM (389 words)

	bimetallic_surfaces
		We have used cyclohexene as a probe molecule of the hydrogenation activity of these bimetallic surfaces.
		This low-temperature hydrogenation reaction pathway indicates that there is hydrogen available on the surface at temperatures as low as ~200 K, either from the dehydrogenation reaction to form benzene or from the background hydrogen in the chamber.
		N.A. Khan, M. Zellner, J.G. Chen, "Cyclohexene Used as a Chemical Probe of the Reactivity of the Pt/Ni(111) Bimetallic Surface," Surf.
	www.che.udel.edu /research_groups/chen/bimetallic_surfaces.html (819 words)

	Low Energy Dissociation Processes of Ionized Cyclohexene: A Theoretical Insight,
		The major dissociation reactions of the cyclohexene radical cation, 1, lead to the cyclopentenyl ion by methyl loss and to ionized 1,3-butadiene after elimination of C
		The energetic and mechanistic aspects of the methyl loss process from the cyclohexene radical cation or the reaction between ionized butadiene and ethylene are discussed with the help of molecular orbital calculations at the B3LYP/6-311+G(3df,2p)//B3LYP/6-31G(d) levels.
		These estimations allow understanding of the experimental observations concerning dissociations of the cyclohexene radical cation, 1, and the collision complex formed between ionized butadiene and ethylene.
	pubs.acs.org /cgi-bin/abstract.cgi/jpcafh/2004/108/i45/abs/jp0480697.html (258 words)

	electrophilic addition - symmetrical alkenes and bromine
		This page gives you the facts and a simple, uncluttered mechanism for the electrophilic addition reactions between bromine (and the other halogens) and alkenes like ethene and cyclohexene.
		Cyclohexene reacts with bromine in the same way and under the same conditions as any other alkene.
		Again, the bromine is polarised by the approaching pi bond in the cyclohexene.
	www.chemguide.co.uk /mechanisms/eladd/symbr2.html (708 words)

	Preparation of adipic acid from cyclohexene
		In this laboratory period the cyclohexene prepared in the previous experiment is oxidised to adipic acid.
		The cleavage of double bonds by oxidation is useful in the synthesis of acids and ketones and determining structures.
		Animations of the vibrational modes have been calculated for both cyclohexene and adipic acid.
	wwwchem.uwimona.edu.jm /lab_manuals/c10expt12.html (790 words)

	[No title]
		Við fengum bara að sjá að cyclohexene sýður milli 80-83(C, og að það oxast við meðhöndlun með potassium permanganate (mno4- er sterkur oxunarmiðill).
		Mikil spenna er (snúningspenna) í cyclohexene sameindinni- þótt að snúningspennuni sé minnkað með því að ýta tveimur kolefnunum með tvítengi út úr planinu, er samt einhver snúningspenna til staðar, og að sjálfsögðu myndast þannig meiri hringsspenna (sameindin nær lægsta mögulega orkuástandinu, en kemst ekki hjá því að vera óstöðugri en cyclohexane sameindin).
		Ef trans mynd “væri” til var of langt í burtu til að loka keðjunni (m.ö.o, ekki hægt er að loka cyclohexene í trans-mynd).
	www.hi.is /~tom/sk/lif14.doc (575 words)

	Offer: Cyclohexene Oxide
		Cyclohexene oxide produced by our company is is a colourless and transparent liquid with a slightly disagreeable smell.
		Cyclohexene oxide(99.5% pure or higher), produced by our company, is a c...
		Cyclohexene oxide produced by our company is is a colourless and transpa...
	www.afacerionline.com /index.php/ShowRoom/showDetails/7938 (129 words)

	RNase H mediated cleavage of RNA by cyclohexene nucleic acid (CeNA) -- Verbeure et al. 29 (24): 4941 -- Nucleic Acids ...
		RNase H mediated cleavage of RNA by cyclohexene nucleic acid (CeNA) -- Verbeure et al.
		The H1' of the cyclohexene ring is therefore upfield shifted
		5 Wang,J., Verbeure,B., Luyten,I., Lescrinier,E., Froeyen,M., Hendrix,C., Rosemeyer,H., Seela,F., Van Aerschot,A. and Herdewijn,P. (2000) Cyclohexene nucleic acids (CeNA): serum stable oligonucleotides that activate RNase H and increase duplex stability with complementary RNA.
	nar.oxfordjournals.org /cgi/content/full/29/24/4941 (3714 words)

	NTP: Executive Summary Cyclohexene oxide: Carcinogenic Activity
		Animal Data: Cyclohexene oxide is not currently on test or scheduled to be tested in a chronic carcinogenicity mammalian bioassay, according to a search of the available literature and databases.
		For example CO was found to inhibit metabolism of the triepoxide antitumorigenic investigative drug, teroxirone, in rat liver and lung microsomal incubations (Ames et al., 1984).
		Sakurai (1988) reported that the oxidative metabolism of cyclohexene by various cytochrome P-450 model systems gave rise to CO as one of several oxidation products with varying yields depending on the components of the system.
	ntp.niehs.nih.gov /index.cfm?objectid=03DD3A15-CFF7-8DB2-022EC2348381EB5C (2943 words)

	Chemistry 102 - Experiment 2
		In the reactions we will perform in this experiment, hexane will be used to represent the saturated hydrocarbons, cyclohexene will be used as an unsaturated hydrocarbon, and toluene, the aromatic hydrocarbon.
		Be especially careful not to spill any of the bromine on your hands, as bromine is an extremely strong oxidizing agent.
		To test the solubility of hexane, cyclohexene and toluene in water, add 1 mL (no more) of each hydrocarbon to three clean test tubes containing about 5 mL water.
	www.miracosta.cc.ca.us /home/dlr/102exp2.htm (1358 words)

	[No title]
		It's safe to first take stock of what we are given: we know the actual amount of cyclohexene (product) obtained from the reaction is 45.0 g; we know the yield is 86.2% and the purity of our cyclohexanol (our starting materials) is 92.3% pure.
		The only way to make a comparison would be by counting people, and in our reaction the only way to make a comparison is to count individual molecules, which is precisely what moles tells us: number of molecules.
		However, we are told that the bottle was contaminated so that if you removed 100 g of the crud, only 92.3 g would be cyclohexanol starting material.
	www.chem.ufl.edu /~eshen/faq2.html (1859 words)

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